Final 2021 changes.

This is actually slower for some reason.

.gitignore

@@ -1 +1,14 @@
 **/target/
+
+
+# Added by cargo
+
+/target
+
+
+# Added by cargo
+#
+# already existing elements were commented out
+
+#/target
+Cargo.lock

2020/Cargo.lock

@@ -7,6 +7,7 @@ dependencies = [
  "anyhow",
  "aoc-runner",
  "aoc-runner-derive",
+ "pretty_assertions",
  "regex",
 ]
 
@@ -19,6 +20,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.34"
@@ -54,6 +64,22 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "ctor"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fbaabec2c953050352311293be5c6aba8e141ba19d6811862b232d6fd020484"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "difference"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+
 [[package]]
 name = "itoa"
 version = "0.4.6"
@@ -72,6 +98,27 @@ version = "2.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
+[[package]]
+name = "output_vt100"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53cdc5b785b7a58c5aad8216b3dfa114df64b0b06ae6e1501cef91df2fbdf8f9"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "pretty_assertions"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
+dependencies = [
+ "ansi_term",
+ "ctor",
+ "difference",
+ "output_vt100",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.24"
@@ -167,3 +214,25 @@ name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

2020/Cargo.toml

@@ -11,3 +11,8 @@ anyhow = "1.0.34"
 aoc-runner = "0.3.0"
 aoc-runner-derive = "0.3.0"
 regex = "1.4.2"
+[dev-dependencies]
+pretty_assertions = "0.6"
+
+[profile.release]
+debug = true

2020/README.md

@@ -1,155 +1,236 @@
 ```
 Advent of code 2020
 Day 1 - Part 1 - binary: 1006875
-	generator: 21.838µs,
+	generator: 21.403µs,
-	runner: 1.773µs
+	runner: 581ns
 
 Day 1 - Part 1 - linear: 1006875
-	generator: 5.339µs,
+	generator: 8.431µs,
-	runner: 8.329µs
+	runner: 11.164µs
 
 Day 1 - Part 1 - set: 1006875
-	generator: 18.303µs,
+	generator: 22.51µs,
-	runner: 1.392µs
+	runner: 1.04µs
 
 Day 1 - Part 2: 165026160
-	generator: 4.735µs,
+	generator: 6.176µs,
-	runner: 1.465477ms
+	runner: 1.320463ms
 
 Day 2 - Part 1: 640
-	generator: 1.713032ms,
+	generator: 1.572384ms,
-	runner: 123.609µs
+	runner: 99.594µs
 
 Day 2 - Part 1 - handrolled: 640
-	generator: 173.912µs,
+	generator: 202.476µs,
-	runner: 109.58µs
+	runner: 106.704µs
 
 Day 2 - Part 2: 472
-	generator: 1.475144ms,
+	generator: 1.341148ms,
-	runner: 10.985µs
+	runner: 10.37µs
 
 Day 3 - Part 1: 148
-	generator: 38.406µs,
+	generator: 35.027µs,
-	runner: 2.797µs
+	runner: 1.018µs
 
 Day 3 - Part 2: 727923200
-	generator: 37.063µs,
+	generator: 33.64µs,
-	runner: 12.181µs
+	runner: 4.379µs
 
 Day 4 - Part 1: 239
-	generator: 372.532µs,
+	generator: 351.073µs,
-	runner: 1.922µs
+	runner: 1.736µs
 
 Day 4 - Part 2: 188
-	generator: 363.202µs,
+	generator: 332.453µs,
-	runner: 43.784µs
+	runner: 42.199µs
 
 Day 5 - Part 1 - glenng: 989
-	generator: 171ns,
+	generator: 181ns,
-	runner: 81.501µs
+	runner: 77.639µs
 
 Day 5 - Part 1 - wathiede: 989
-	generator: 85.614µs,
+	generator: 83.219µs,
-	runner: 459ns
+	runner: 632ns
 
 Day 5 - Part 2 - wathiede: 548
-	generator: 86.417µs,
+	generator: 76.923µs,
-	runner: 29.328µs
+	runner: 28.274µs
 
 Day 6 - Part 1: 6930
-	generator: 118ns,
+	generator: 122ns,
-	runner: 630.141µs
+	runner: 548.722µs
 
 Day 6 - Part 2: 3585
-	generator: 127ns,
+	generator: 109ns,
-	runner: 2.007135ms
+	runner: 1.786837ms
 
 Day 6 - Part 2 - faster: 3585
-	generator: 129ns,
+	generator: 119ns,
-	runner: 1.095441ms
+	runner: 911.866µs
 
 Day 7 - Part 1: 222
-	generator: 1.109401ms,
+	generator: 936.409µs,
-	runner: 202.592µs
+	runner: 181.642µs
 
 Day 7 - Part 2: 13264
-	generator: 1.092186ms,
+	generator: 898.057µs,
-	runner: 5.447µs
+	runner: 4.034µs
 
 Day 8 - Part 1: 1744
-	generator: 143ns,
+	generator: 183ns,
-	runner: 47.289µs
+	runner: 38.058µs
 
 Day 8 - Part 2: 1174
-	generator: 111ns,
+	generator: 119ns,
-	runner: 150.1µs
+	runner: 144.217µs
 
 Day 9 - Part 1: 1309761972
-	generator: 27.284µs,
+	generator: 29.337µs,
-	runner: 37.991µs
+	runner: 40.825µs
 
 Day 9 - Part 1 - sorted: 1309761972
-	generator: 26.598µs,
+	generator: 26.371µs,
-	runner: 230.765µs
+	runner: 222.038µs
 
 Day 9 - Part 2: 177989832
-	generator: 28.558µs,
+	generator: 29.874µs,
-	runner: 124.417µs
+	runner: 119.825µs
 
 Day 10 - Part 1: 1625
-	generator: 6.835µs,
+	generator: 6.602µs,
-	runner: 421ns
+	runner: 528ns
 
 Day 10 - Part 2: 3100448333024
-	generator: 4.802µs,
+	generator: 4.893µs,
-	runner: 1.176µs
+	runner: 1.448µs
 
 Day 11 - Part 1: 2338
-	generator: 75.55µs,
+	generator: 67.172µs,
-	runner: 11.383128ms
+	runner: 12.483103ms
 
 Day 11 - Part 2: 2134
-	generator: 58.641µs,
+	generator: 117.56µs,
-	runner: 49.994105ms
+	runner: 47.514021ms
 
 Day 12 - Part 1: 1838
-	generator: 38.302µs,
+	generator: 81.477µs,
-	runner: 8.936µs
+	runner: 9.093µs
 
 Day 12 - Part 2: 89936
-	generator: 33.951µs,
+	generator: 55.605µs,
-	runner: 8.316µs
+	runner: 8.085µs
 
 Day 13 - Part 1: 153
-	generator: 2.04µs,
+	generator: 2.293µs,
-	runner: 205ns
+	runner: 384ns
 
 Day 13 - Part 2: 471793476184394
-	generator: 2.258µs,
+	generator: 2.142µs,
-	runner: 3.68µs
+	runner: 2.576µs
 
 Day 14 - Part 1: 10717676595607
-	generator: 93ns,
+	generator: 86ns,
-	runner: 89.201µs
+	runner: 117.882µs
 
 Day 14 - Part 2: 3974538275659
-	generator: 92ns,
+	generator: 155ns,
-	runner: 5.803116ms
+	runner: 5.737865ms
 
 Day 15 - Part 1: 929
-	generator: 177ns,
+	generator: 145ns,
-	runner: 253.908µs
+	runner: 257.345µs
 
 Day 15 - Part 2: 16671510
-	generator: 114ns,
+	generator: 106ns,
-	runner: 2.423626128s
+	runner: 2.520441045s
 
 Day 16 - Part 1: 23115
-	generator: 246.028µs,
+	generator: 268.255µs,
-	runner: 24.917µs
+	runner: 23.009µs
 
 Day 16 - Part 2: 239727793813
-	generator: 246.67µs,
+	generator: 214.632µs,
-	runner: 429.366µs
+	runner: 392.169µs
+
+Day 17 - Part 1: 315
+	generator: 3.741µs,
+	runner: 2.863143ms
+
+Day 17 - Part 2: 1520
+	generator: 2.332µs,
+	runner: 29.722289ms
+
+Day 19 - Part 1: 178
+	generator: 1.706494ms,
+	runner: 228.465µs
+
+Day 19 - Part 2: 346
+	generator: 50.489244ms,
+	runner: 9.837093ms
+
+Day 21 - Part 1: 2595
+	generator: 314.271µs,
+	runner: 613.046µs
+
+["sesame", "nuts"]: thvm ckqq qrsczjv zmb zrgzf jmdg hlmvqh *pnglkx *nfnzx *tjsdp *jkbqk *rpmqq *gzgvdh *rgdx *szsbj *xjdhk *zfml *ddbmq *mvnqdh *gsgmdn *dtlhh *rqqfnlc *bxv *nthhxn *hnmjfl *fkh *hkxcb *rpcdfph *flhfddq *qspfqb *rpmmv *jfqqgtl *xxfgvz *kltcm *xjrpr *vnfmc *xhmmt *zkzdrn *xgbvk *ngqh *djpsmd *bnzq *rbvdt *tfmgl *pjln
+["sesame"]: thvm mrfxh ckqq hlmvqh zmb qrsczjv zrgzf *qchnn *dnpgcd *zfml *gsgmdn *frld *nfnzx *nqfc *xbpb *kltcm *ljmvpp *zntrfp *gzgvdh *rrbndl *pptgt *rknm *qsgb *mstc *zzldmh *nggcjr *bkd *zfsks *cxzkmr *tzjnvp *npbnj *lh *pfqxsxd *clqk *rpmmv *szsbj *mnvq *cnghsg *jdtzr *kfsfn *jxjqp *knqzf *lvjpp *qdpbx *xxfgvz *ngqh *jvvmcq *zmcj *dsmc *xhmmt
+["eggs"]: hlmvqh qrsczjv thvm zrgzf ckqq jmdg mrfxh *klmjmz *clqk *pjln *lvjpp *tbm *rqqfnlc *gzgvdh *klx *sfk *bnzq *mhrm *vht *pjqdmpm *tfmgl *cxzkmr *ghr *rxrgtvs *rfh *rhrc *vnfmc *ljhn *fbcds *rkzhxmh *htllnq *xhmmt *rcr *dgrrm *xlzqfb *xlnn *vpgvm *zntrfp *pgqxp *xjrpr *vnmfg *vqrjn *thcs *mnvq *rczbvg *bkd *zqsc *ngqh *rpmqq *zmcj *cbbkfx *rpcdfph *jfqqgtl *mszc *tzjnvp *sdccxkt *rcvd *pcf *xzcdnr *jgtrnm *zfcvnj *dsmc *gjqfj *gtgrcf *nthhxn *jngghk *hnmjfl *qspfqb *bxv
+["dairy", "peanuts", "eggs"]: mrfxh zrgzf zmb jmdg thvm ckqq hlmvqh *nthhxn *htllnq *pbn *qsgb *dvcfx *mstc *jngghk *xddkbd *dpfphd *zhghprj *rfh *ljmvpp *vtljml *pmtfmv *xxfgvz *crnfzr *xbpb *tshn *nqfc *kmsh *rknm *hkqp *pjqdmpm *pjln *ddbmq *bjvcg *zntrfp *vnfmc *qszmzsh *fhtsl *tjsdp *kfsfn *jkbqk *mnvq *dnpgcd *xzcdnr *xjrpr *rbvdt *vht *jxjqp *zzldmh *cnghsg *pzxj *jfqqgtl *kqzcj *lxr *glrc *dgrrm *cxzkmr *clqk *xjdhk *vpvj *lbfgp *klmjmz
+["dairy"]: zrgzf thvm mrfxh zmb hlmvqh jmdg ckqq *rqqfnlc *vgp *tbm *tjsdp *tshn *zzldmh *vgjbgj *pptgt *xnfhq *pbn *rpmmv *dnpgcd *qszmzsh *rbvdt *nzlks *xddkbd *npbnj *lxr *szsbj *dtlhh *ljmvpp *xjzc *pjqdmpm *rknm *rrbndl *xhmmt *pjln *pfqxsxd *jdtzr *jnr *jkbqk *vht *vhcnpg *ddgdhg *pzxj *ljhn *xgbvk *qfkjsq *zhghprj *gzgvdh *xzcdnr *ddbmq *rcvd *lbfgp *mvnqdh *rfh *nggcjr *gjqfj *hrfmdk
+["soy", "shellfish"]: jmdg ckqq qrsczjv thvm mrfxh hlmvqh zrgzf *cmnb *cnghsg *cxzkmr *vfkpj *pgb *xddkbd *qfvfzg *gzgvdh *bxv *zfml *clqk *pbn *nthhxn *rvchbn *xbpb *sfk *dtlhh *rqqfnlc *rhrc *djpsmd *qrftr *gjqfj *bjvcg *zntrfp *zlgztsbd *lbfgp *vnmfg *jkbqk *lvjpp *pfqxsxd *ljmvpp *mnvq *ljhn *fkh *ddrd *qmmt *rcr *vht *xgbvk *ddbmq *tbm *vhcnpg *srgnx *ngqh *mhrm *pptgt *glrc *rpmmv *kx *htllnq
+["nuts", "dairy", "sesame"]: ckqq jmdg zmb thvm mrfxh zrgzf qrsczjv *fdf *tshn *zhghprj *xjzc *xxfgvz *nggcjr *hkqp *vgjbgj *hnmjfl *mstc *dmxhhd *rpmmv *jdtzr *klx *ngqh *gtgrcf *bjvcg *vgp *jgtrnm *ttxx *bcvmz *pgqxp *nfnzx *sjgx *zfcvnj *tzjnvp *qmmt *qdpbx *rhrc *gmc *zfsks *ljmvpp *gjqfj *fjgxv *zttx *lbskg *vnfmc *vfkpj *lxr *hkxcb *dln *xbpb *sfk *vpgvm *ljhn *rknm *rfh *mgxzl *thcs *jfqqgtl *bkd *sdccxkt *zzldmh *rcvd *qchnn *xhmmt *rkzhxmh *xgbvk *csfmx *gzgvdh *ncqdr *rxr *vtljml *lbfgp *pzxj *djpsmd *dpfphd *rczbvg *knnmm *xmjlsn
+["nuts", "sesame"]: qrsczjv jmdg hlmvqh mrfxh ckqq thvm zmb *klx *hkqp *lqmfgp *mstc *mgxzl *cxfzhj *xxfgvz *jxjqp *ljhn *pcf *mrxg *bjvcg *vht *lbskg *tphtz *nldzpc *tjsdp *mszc *sfk *dln *ghr *mppf *lbfgp *zkzdrn *qdpbx *bnzq *qsgb *rrbndl *nggcjr *zttx *qjsbk *llgsg *srgnx *dbx *stcsp *rcr *zfml *jvvmcq *pptgt *gmc *fkh *xjdhk *pzxj *zntrfp *flhfddq *knqzf *ddrd *jmgt *fdf *thcs *lh *xmjlsn *kglr *pjqdmpm *kx *dpfphd *vqrjn *vhcnpg *rxrgtvs *pfqxsxd *nqfc *cbbkfx *dtlhh *qmmt *xlzqfb *rpmmv *jfqqgtl *gsgmdn *bcvmz *mnvq *fbcds *xjzc *gtgrcf
+["soy"]: hlmvqh zmb qrsczjv zrgzf thvm ckqq jmdg *gzgvdh *vbqbkt *fjgxv *nggcjr *jvvmcq *pptgt *fmvvb *zqsc *rbvdt *llgsg *xddkbd *rfh *pjln *tzjnvp *glrc *rqqfnlc *zttx *rrbndl *qfkjsq *mppf *rxrgtvs *lvjpp *dtlhh *zfml *stcsp *zkzdrn *vtljml *qdpbx *fstgc *xlnn *sdccxkt *hkxcb *kltcm *xlzqfb *jfqqgtl *npbnj *bcvmz *rknm *ngqh *xbpb *rcr *kglr *dbx *xxfgvz *bjvcg *rpmmv *srgnx *gjqfj *tshn *gmc *vgp *dgrrm *ljhn *knnmm *qkgqv *mstc *pnglkx *flhfddq *tjsdp *zntrfp *vgjbgj *bkd
+["wheat", "dairy"]: ckqq jmdg zmb thvm hlmvqh zrgzf mrfxh *qjsbk *fkh *xddkbd *fjgxv *lbfgp *rxr *tphtz *vhcnpg *klmjmz *pmtfmv *hrfmdk *dbx *fbcds *jnr *xxfgvz *pfqxsxd *qfvfzg *bxv *flhfddq *rknm *rpmqq *pjln *sdccxkt *pgb *klx *jdtzr *lxr *nthhxn *vnmfg *jgtrnm *nfnzx *zzldmh *ddbmq *nldzpc *tvqbhv *dznd *dnpgcd *cmnb *vpvj *sjgx *xjzc *hkxcb *szsbj *dcbk *pmvl *pjqdmpm *mhrm *rgdx *jfqqgtl *zttx *vtljml *cbbkfx *knqzf *mszc *jkbqk *xbpb *vgjbgj *pptgt *vfkpj *vqrjn *zhghprj *xnfhq *tshn *rcvd *xjdhk *djpsmd *rfh *glrc *rkzhxmh
+["peanuts", "soy"]: ckqq jmdg qrsczjv hlmvqh thvm zrgzf zmb *mvnqdh *nqfc *bjvcg *zfcvnj *ljhn *hkqp *srgnx *zfsks *bxv *xbpb *rkzhxmh *cxfzhj *rpmqq *zdntns *dnpgcd *thcs *lvjpp *klx *jngghk *flhfddq *gmc *pjln *dcbk *cbbkfx *vbqbkt *qchnn *tshn *fhtsl *qmthj *jvvmcq *ncqdr *jmgt *csfmx *tzjnvp *rczbvg *rcr *rbvdt *gtgrcf *cnghsg *rxrgtvs
+["shellfish", "eggs", "dairy"]: ckqq zrgzf qrsczjv thvm jmdg mrfxh hlmvqh *frld *mvnqdh *tphtz *bjvcg *xzcdnr *djpsmd *ttxx *dcbk *qdpbx *tshn *rczbvg *vpvj *qmmt *ddrd *dln *bxv *jxjqp *lh *mgxzl *ltvr *pbn *nggcjr *dsmc *llgsg *knnmm *pzxj *cnghsg *vnmfg *mhrm *xlnn *gjqfj *pptgt *jkbqk *htllnq *xnfhq *klx *jmgt *rxr *hnmjfl *lqmfgp *qrftr *mppf *sjgx *rvchbn *lvjpp *mstc *zqsc *gmc *kmsh *rpmmv *crnfzr *hrfmdk *kglr *cxzkmr *dvcfx
+["nuts", "shellfish"]: jmdg mrfxh thvm qrsczjv zmb ckqq zrgzf *xjrpr *mjpt *cbbkfx *rpmqq *ljhn *vht *sdccxkt *ngqh *bnzq *jgtrnm *fmvvb *xxfgvz *jfqqgtl *tfmgl *bcvmz *pgqxp *crnfzr *xddkbd *zfsks *pzxj *tshn *fbcds *lbfgp *thcs *hkqp *gsgmdn *dvcfx *cnghsg *csfmx *vhqfz *rxr *bxv *xjdhk *zhghprj *dtlhh *qmthj *jxjqp *rczbvg *gmc *sfk *ttxx *ltvr *pnglkx *dnpgcd *qsgb *clqk *klmjmz *lh *rvchbn *pjln *knqzf *vnfmc *qspfqb *nthhxn *zqsc *mhrm *gzgvdh *ncqdr *ddrd *vqrjn
+["dairy"]: zrgzf qrsczjv ckqq thvm mrfxh hlmvqh jmdg *rvchbn *vhcnpg *mstc *hkqp *bnzq *xbpb *fhtsl *fjgxv *ddgdhg *jfqqgtl *rpmqq *dpfphd *pcf *qrftr *ngqh *vht *dvcfx *dfrg *tphtz *mnvq *qjsbk *mvnqdh *zntrfp *xjzc *jmgt *xzcdnr *vnfmc *xddkbd *fkh *kmsh *xmjlsn *zfsks *bcvmz *ljhn *gmc *rrbndl *fmvvb *cxzkmr *lh *zdntns *pgb *xxfgvz *hrfmdk *dln *tvqbhv *cnghsg *vpgvm *mjpt *jdtzr *dgrrm *kglr *pgqxp *kqzcj *hkxcb *xgbvk *djpsmd *tshn *klmjmz *rfh *xlnn *bjvcg *qfkjsq *rkzhxmh *glrc *clqk *gjqfj *knqzf *ljmvpp *csfmx *rbvdt *zfcvnj *dsmc *fstgc
+["sesame", "shellfish"]: mrfxh zmb hlmvqh qrsczjv thvm zrgzf ckqq *nthhxn *vnfmc *dsmc *vpvj *rhrc *zfcvnj *zdntns *qmthj *knnmm *rpmmv *dtlhh *qdpbx *zhghprj *xddkbd *rqqfnlc *dpfphd *xhmmt *dgrrm *pgqxp *gmc *flhfddq *zkzdrn *vhcnpg *mjpt *fbcds *ncqdr *pjln *zttx *hrfmdk *xlnn *dvcfx *fkh *mszc *klx *cmnb *zfml *mnvq *rcr *bjvcg *csfmx *xlzqfb
+["eggs"]: hlmvqh jmdg ckqq zrgzf mrfxh thvm qrsczjv *xnfhq *lh *qdpbx *rpcdfph *qsgb *rpmqq *tjsdp *ljhn *gsgmdn *vfkpj *xlzqfb *qmmt *jmgt *dvcfx *bkd *pmvl *ngqh *sjgx *dpfphd *kfsfn *bjvcg *jkbqk *qrftr *mjpt *vnmfg *nldzpc *ncqdr *jvvmcq *pptgt *pjqdmpm *pjln *ddrd *csfmx *kglr *xgbvk *tzjnvp *bxv *htllnq *fstgc *zfcvnj *jxjqp *pbn *dsmc *kbtx *vqrjn *rqqfnlc *rxrgtvs *hnmjfl
+["shellfish", "dairy"]: zrgzf hlmvqh mrfxh thvm jmdg qrsczjv ckqq *mvnqdh *klx *rbvdt *kx *qmthj *hrfmdk *bcvmz *fhtsl *xxfgvz *pmvl *csfmx *hkxcb *rpmqq *vpvj *jmgt *vbqbkt *lxr *zhghprj *kglr *dpfphd *xzcdnr *mszc *vgp *dvcfx *gzgvdh *ncqdr *mppf *nldzpc *djpsmd *pnglkx *lqmfgp *sjgx *jfqqgtl *dln *vhcnpg *npbnj *cmnb *hnmjfl *kfsfn *vtljml *qspfqb *xlzqfb *dcbk *jngghk *lh *jxjqp *rxr *jdtzr *qrftr *fbcds *mrxg *zzldmh *qfvfzg *dtlhh *hkqp *dsmc *qdpbx *cxzkmr *tfmgl *xjrpr *pjqdmpm *rczbvg *rcvd *lbfgp *qszmzsh *glrc *qkgqv *tvqbhv *fkh *rknm *zntrfp *cbbkfx
+["nuts"]: zmb thvm qrsczjv zrgzf ckqq jmdg hlmvqh *zqsc *sfk *lvjpp *ddgdhg *qspfqb *dmxhhd *zzldmh *xzcdnr *xjdhk *dznd *qfvfzg *ljhn *ghr *bcvmz *frld *pnglkx *fhtsl *srgnx *jfqqgtl *fdf *vhqfz *qsgb *jkbqk *xxfgvz *pjqdmpm *rpmqq *fkh *crnfzr *mjpt *cnghsg *qrftr *xddkbd *rkzhxmh *pfqxsxd *mhrm *gtgrcf *fmvvb *tvqbhv *dgrrm *xbpb *qmthj *gjqfj *kqzcj *tshn *qkgqv *vfkpj *kmsh *pgqxp *ddrd *glrc *xgbvk *hrfmdk *rgdx *bnzq *knnmm *qchnn *vnmfg *ncqdr *qfkjsq *pmtfmv *xnfhq *sjgx *cbbkfx *stcsp *rbvdt *mstc *gzgvdh *kglr *dsmc *rrbndl *xjzc *rpcdfph
+["dairy", "wheat", "eggs"]: jmdg zmb hlmvqh qrsczjv thvm ckqq zrgzf *rbvdt *zkzdrn *hnmjfl *gmc *pgqxp *lqmfgp *knqzf *xbpb *fmvvb *bkd *dgrrm *vgjbgj *dcbk *ttxx *dtlhh *vpgvm *xlnn *jgtrnm *dpfphd *xzcdnr *jngghk *qmmt *flhfddq *gzgvdh *crnfzr *qszmzsh *xlzqfb *dfrg *qspfqb *qmthj *rpcdfph *frld *zqsc *xjdhk *dmxhhd *ljhn *qchnn *bnzq *kltcm *gtgrcf *mszc *zhghprj *rhrc *csfmx *mrxg *klmjmz *lbskg *pzxj *nggcjr *nthhxn *nldzpc *rpmqq *dbx *mhrm *xjzc
+["sesame"]: jmdg zmb thvm qrsczjv mrfxh hlmvqh ckqq *lh *sfk *jvvmcq *szsbj *fmvvb *xxfgvz *sjgx *jnr *vqrjn *gmc *cnghsg *qsgb *mppf *jfqqgtl *fjgxv *vbqbkt *zqsc *xgbvk *pgqxp *nqfc *jmgt *rfh *xlnn *rhrc *nfnzx *rpcdfph *qszmzsh *kglr *xnfhq *tbm *zzldmh *rcvd *pmvl *kqzcj *hnmjfl *nggcjr *qchnn *zmcj *rvchbn *fdf *xmjlsn *mnvq *mgxzl *rkzhxmh *bxv *ngqh *xlzqfb *gjqfj *sdccxkt *clqk *cmnb *rbvdt *jkbqk *dpfphd *kltcm *jngghk *mszc
+["dairy"]: thvm mrfxh zmb ckqq zrgzf hlmvqh qrsczjv *zfcvnj *mvnqdh *gjqfj *htllnq *nggcjr *vtljml *qrftr *fstgc *xjrpr *dvcfx *klmjmz *qjsbk *rcvd *hrfmdk *rczbvg *mjpt *ncqdr *kbtx *nqfc *xxfgvz *xlzqfb *jkbqk *jmgt *rxrgtvs *qspfqb *rhrc *qmthj *mszc *ghr *fmvvb *cxfzhj *lqmfgp *vfkpj *tzjnvp *mhrm *vpvj *pgqxp *ngqh *xlnn *xnfhq *tbm *zqsc *jvvmcq *rvchbn *lxr *vgp *cmnb *pjqdmpm
+["wheat"]: mrfxh zrgzf jmdg thvm hlmvqh qrsczjv zmb *qfvfzg *ngqh *rhrc *nthhxn *mvnqdh *rcr *knnmm *zmcj *nfnzx *stcsp *nzlks *qdpbx *kfsfn *nldzpc *cxzkmr *fkh *vpvj *llgsg *pgb *cmnb *ncqdr *qchnn *rknm *xjzc *zntrfp *mstc *clqk *gsgmdn *jnr *ljhn *mppf *hkqp *xlnn *xgbvk *csfmx *rpmmv *fmvvb *mjpt *zlgztsbd *dtlhh *dln *bnzq *klmjmz *tfmgl *vgp *qmmt *kglr *dbx *gzgvdh *rcvd *kmsh *rgdx *kqzcj *ttxx *tzjnvp *qmthj *zfsks *lh *vhcnpg *pgqxp *zhghprj *vht *rxr *vbqbkt *pcf *gtgrcf *zzldmh *dvcfx
+["dairy", "wheat", "peanuts"]: zrgzf mrfxh hlmvqh zmb ckqq thvm qrsczjv *vfkpj *kbtx *qkgqv *bkd *srgnx *rcr *zdntns *tjsdp *kfsfn *rhrc *mstc *vtljml *zlgztsbd *rbvdt *glrc *qfvfzg *rkzhxmh *ddbmq *pbn *flhfddq *dfrg *kglr *clqk *rxrgtvs *cxzkmr *ddgdhg *cmnb *rpmmv *dln *zttx *pjln *pjqdmpm *jmgt *qdpbx *rcvd *rrbndl *vbqbkt *xmjlsn *lh *xhmmt *qmthj *nzlks *pgb *xzcdnr *mrxg *xgbvk *fkh *vgp *rqqfnlc *gjqfj *gsgmdn *tbm *szsbj *bxv *lxr *cnghsg *jfqqgtl *dbx *pmtfmv *lvjpp *xjzc *xlnn *dtlhh *dsmc *vnfmc *zkzdrn *ghr *fhtsl
+["dairy", "sesame"]: zmb jmdg hlmvqh thvm ckqq qrsczjv mrfxh *nldzpc *pbn *rxr *vgp *pgqxp *zfsks *vfkpj *tvqbhv *qmmt *pjln *qfkjsq *hnmjfl *mrxg *dln *nqfc *lbfgp *rcr *kfsfn *vtljml *rxrgtvs *tbm *dsmc *hkqp *lh *jngghk *vbqbkt *fbcds *clqk *pjqdmpm *mppf *tzjnvp *xhmmt *csfmx *rpcdfph *sdccxkt *kbtx *knqzf *rkzhxmh *mszc *ttxx *klx *mnvq
+["wheat", "peanuts"]: ckqq hlmvqh zmb zrgzf mrfxh jmdg qrsczjv *rgdx *tfmgl *gmc *fstgc *ltvr *pnglkx *kglr *hkqp *ddgdhg *qfkjsq *xzcdnr *jnr *xxfgvz *zhghprj *ghr *pfqxsxd *ljmvpp *cmnb *nldzpc *dznd *xlnn *lh *zfcvnj *dcbk *kmsh *xjrpr *qjsbk *nzlks *gtgrcf *kfsfn *dpfphd *rqqfnlc *mppf *zzldmh *thcs *cbbkfx *jmgt *rcr *pjln *jxjqp *fmvvb *pmvl *mgxzl *knqzf *rbvdt *gzgvdh *nqfc *vnmfg *qszmzsh *tjsdp *ljhn *qrftr *ddbmq *bkd *fbcds
+["peanuts"]: mrfxh zrgzf hlmvqh thvm zmb qrsczjv jmdg *clqk *rpmmv *rkzhxmh *pbn *pmvl *hkxcb *mvnqdh *kbtx *tzjnvp *ncqdr *kmsh *dcbk *qchnn *bkd *kqzcj *cmnb *mjpt *knnmm *pzxj *frld *gsgmdn *pfqxsxd *ltvr *lqmfgp *fkh *rbvdt *vgjbgj *nldzpc *jgtrnm *dbx *qrftr *zdntns *lbskg *rpcdfph *djpsmd *vbqbkt *dsmc *jdtzr *qmthj *hnmjfl *sfk *mppf *fmvvb *rcr *xmjlsn *csfmx *dln *vqrjn *xbpb *stcsp *fdf *rxrgtvs *mstc *ljhn *npbnj *thcs *ddbmq *knqzf *dgrrm *rqqfnlc *mszc *jnr *lbfgp *qsgb *dtlhh *pgb *bcvmz *qszmzsh *rfh *gjqfj *xlzqfb *rxr
+["soy", "wheat", "eggs"]: thvm zrgzf jmdg zmb ckqq hlmvqh mrfxh *clqk *csfmx *lvjpp *kqzcj *zntrfp *dcbk *ghr *vtljml *pfqxsxd *pjqdmpm *jgtrnm *flhfddq *zzldmh *llgsg *nthhxn *mjpt *pjln *dznd *mnvq *bjvcg *nfnzx *tzjnvp *vgp *dtlhh *qmmt *rpmmv *zfcvnj *xzcdnr *tbm *dbx *bxv *cxzkmr *tfmgl *mszc *ttxx *qkgqv *qjsbk *pgqxp *zfml *mhrm *vpvj *jdtzr *mgxzl *tvqbhv *qfvfzg *vhcnpg *lbskg *lqmfgp *cnghsg *rcvd *hnmjfl *zhghprj *xjrpr *xxfgvz *dln *gtgrcf *sdccxkt *kx *qspfqb *jfqqgtl *pptgt *dmxhhd *rpcdfph *fstgc *rcr *fmvvb *ljmvpp *mrxg *gmc *pgb *kmsh *cmnb
+["peanuts", "eggs", "nuts"]: hlmvqh qrsczjv ckqq zrgzf zmb jmdg mrfxh *klx *nggcjr *xjrpr *zdntns *kltcm *vhcnpg *xlnn *kqzcj *dnpgcd *vht *rpmmv *bnzq *hnmjfl *lbskg *fdf *bkd *dgrrm *rvchbn *mgxzl *pgb *jdtzr *dcbk *qszmzsh *rpmqq *hrfmdk *qrftr *dpfphd *lxr *ngqh *xddkbd *tbm *vqrjn *qchnn *vpvj *mstc *pbn *jxjqp *jgtrnm *tfmgl *rqqfnlc *xmjlsn *rxr *pmtfmv *zmcj *zfsks *zqsc *crnfzr *fbcds *xgbvk *hkxcb *gmc *nldzpc *nfnzx *xnfhq
+["dairy", "sesame", "eggs"]: thvm zmb jmdg mrfxh zrgzf ckqq hlmvqh *csfmx *zzldmh *dcbk *fdf *rhrc *fjgxv *qchnn *cxzkmr *qmthj *crnfzr *nqfc *zmcj *mhrm *ltvr *sdccxkt *flhfddq *cbbkfx *cmnb *qdpbx *xmjlsn *fhtsl *knqzf *bxv *nggcjr *vnmfg *cxfzhj *jdtzr *pnglkx *lxr *kmsh *vgjbgj *dln *mppf *gzgvdh *rpmmv *zntrfp *pgqxp *zfml *vnfmc *vht *pmvl *xlzqfb *rxrgtvs *kltcm *pzxj *dsmc *dtlhh *hrfmdk *qmmt *dnpgcd *bjvcg *gsgmdn *cnghsg *xhmmt *gmc *ttxx *qjsbk *fkh *vhqfz *xxfgvz
+["peanuts"]: ckqq jmdg mrfxh zmb hlmvqh thvm zrgzf *jmgt *mppf *ttxx *dsmc *xnfhq *bxv *kglr *bcvmz *dfrg *jnr *mnvq *ngqh *sfk *fdf *xhmmt *fjgxv *zfcvnj *rczbvg *cmnb *xjrpr *szsbj *dvcfx *gtgrcf *knqzf *pjln *lbfgp *vnmfg *jdtzr *mhrm *fstgc *tbm *djpsmd *pnglkx *qkgqv *vfkpj *hkxcb *qfkjsq *pgqxp *xzcdnr *nfnzx *npbnj *rbvdt *jfqqgtl *qfvfzg *jvvmcq *hnmjfl *rgdx *gjqfj *zhghprj *kqzcj *rcr *tvqbhv *tshn
+["dairy", "sesame"]: qrsczjv zrgzf thvm ckqq hlmvqh mrfxh zmb *rknm *lvjpp *cnghsg *sdccxkt *rcvd *rxrgtvs *stcsp *fstgc *ttxx *pmvl *rpcdfph *dznd *pptgt *mstc *rpmmv *fdf *knnmm *jnr *bjvcg *mnvq *qdpbx *zfml *rqqfnlc *zqsc *zhghprj *mgxzl *qmmt *fkh *rxr *dsmc *lbskg *sfk *xhmmt *kqzcj *vfkpj *mhrm *pcf *jmgt *ljmvpp *jfqqgtl *szsbj *xjrpr *vnfmc *qszmzsh *dbx *mszc *xlnn *qrftr *qchnn *mjpt *zttx *ddgdhg *gmc *djpsmd *zfcvnj *dln *qkgqv *rcr *dnpgcd *tzjnvp *hkxcb *zmcj *lxr *bcvmz *fhtsl *vnmfg *vpgvm
+["sesame", "dairy", "shellfish"]: jmdg thvm mrfxh zmb ckqq qrsczjv zrgzf *rgdx *cmnb *fstgc *pfqxsxd *ncqdr *dmxhhd *glrc *xjrpr *rkzhxmh *fhtsl *hkxcb *pmtfmv *zfsks *knnmm *pgb *vnmfg *thcs *dfrg *ddbmq *clqk *zntrfp *nthhxn *xjzc *dgrrm *lvjpp *rpmmv *vht *lh *jfqqgtl *vgp *mszc *rczbvg *jnr *jngghk *xhmmt *vhqfz *bcvmz *tjsdp *bkd *xlzqfb *xddkbd *pmvl *ddgdhg *djpsmd *ttxx *zfcvnj *mjpt *nldzpc *qrftr *kx *xnfhq *fjgxv *jmgt *ljhn *mrxg *pbn *sdccxkt *rxrgtvs *dln *dpfphd *tbm *rfh *tvqbhv
+["eggs"]: zmb thvm jmdg hlmvqh mrfxh zrgzf ckqq *rczbvg *cxfzhj *lxr *mgxzl *hkxcb *kbtx *jvvmcq *pmtfmv *jfqqgtl *jxjqp *mszc *rknm *vfkpj *qmmt *ltvr *cnghsg *pjln *gzgvdh *szsbj *pgb *dcbk *lvjpp *qchnn *bcvmz *sdccxkt *llgsg *xgbvk *mrxg *ghr *zhghprj *hkqp *thcs *zzldmh *frld *gtgrcf *pnglkx *clqk *kglr *xhmmt *hnmjfl *qjsbk *qfvfzg *dnpgcd *dbx *djpsmd *qrftr *rgdx *tvqbhv *ncqdr
+["shellfish"]: zmb zrgzf jmdg hlmvqh qrsczjv mrfxh ckqq *pmvl *rxrgtvs *mvnqdh *dznd *srgnx *qmmt *pgb *dgrrm *xjdhk *klx *rcvd *cnghsg *ttxx *hrfmdk *qspfqb *pfqxsxd *fmvvb *pzxj *sfk *rbvdt *nggcjr *zqsc *npbnj *kglr *xddkbd *lbskg *lqmfgp *mrxg *zfml *rkzhxmh *jfqqgtl *vgjbgj *rpmmv *tphtz *mszc *dln *zfcvnj *vpgvm *tzjnvp *rhrc *nldzpc *rknm *tshn *jgtrnm *mppf *fjgxv *ddgdhg *vpvj *fbcds
+["nuts", "sesame"]: jmdg thvm mrfxh zmb ckqq zrgzf qrsczjv *xlzqfb *nthhxn *dln *rczbvg *vgp *cbbkfx *gsgmdn *jvvmcq *glrc *klmjmz *stcsp *bcvmz *dbx *vpvj *cmnb *sjgx *rfh *rrbndl *mgxzl *jnr *rhrc *xlnn *mhrm *bxv *qrftr *lvjpp *fjgxv *kglr *cxfzhj *pptgt *ghr *kbtx *pnglkx *qjsbk *jfqqgtl *fstgc *dznd *qszmzsh *jgtrnm *tjsdp *klx *pjln *vgjbgj *vbqbkt *zkzdrn *sfk *vhqfz *hrfmdk *kltcm *vnfmc *zqsc *xhmmt *knnmm *qfvfzg *xjrpr *nqfc *jkbqk
+["shellfish", "peanuts"]: ckqq zmb thvm mrfxh hlmvqh zrgzf qrsczjv *jgtrnm *bxv *fbcds *dznd *bkd *ttxx *rpmqq *pmvl *dtlhh *xjdhk *zdntns *knnmm *vqrjn *dsmc *lqmfgp *ltvr *jfqqgtl *mszc *xhmmt *szsbj *crnfzr *fkh *rbvdt *pjqdmpm *nggcjr *qrftr *bcvmz *qmmt *srgnx *xddkbd *rvchbn *cmnb *pptgt *xjzc *llgsg *rxr *bnzq *gsgmdn *zzldmh *rcvd *dgrrm *zfsks *qsgb *tvqbhv *zkzdrn *nzlks *lh *klmjmz *rxrgtvs *kqzcj *mnvq *ngqh *rczbvg *tshn *tjsdp *pcf *fdf *rfh *pnglkx *hkqp *jkbqk *sdccxkt *fstgc *vpvj *ddbmq *zttx *xlzqfb *qfvfzg *frld *zlgztsbd *xnfhq *pfqxsxd *cxfzhj *cxzkmr *tphtz *clqk
+["nuts"]: zrgzf thvm hlmvqh qrsczjv mrfxh ckqq jmdg *hrfmdk *nthhxn *lh *rbvdt *qdpbx *mhrm *vhqfz *lqmfgp *qjsbk *vgp *qfvfzg *szsbj *nldzpc *vpgvm *sdccxkt *dgrrm *tfmgl *zdntns *ddgdhg *zfsks *zmcj *pnglkx *ncqdr *sfk *rqqfnlc *vht *mstc *pmvl *cmnb *gmc *thcs *bjvcg *nzlks *klx *jfqqgtl *fkh *ghr *ddbmq *htllnq *xlnn *kglr
+["eggs", "nuts", "dairy"]: mrfxh qrsczjv hlmvqh jmdg thvm zrgzf zmb *fkh *knqzf *tvqbhv *hkqp *nqfc *mvnqdh *xxfgvz *gzgvdh *vnfmc *qrftr *ngqh *cxzkmr *mjpt *dvcfx *zmcj *xddkbd *clqk *rvchbn *dsmc *xjzc *pfqxsxd *dfrg *qmmt *mhrm *flhfddq *rrbndl *xnfhq *dznd *frld *jnr *djpsmd *qjsbk *ddbmq *qchnn *pnglkx *dtlhh *zhghprj *fhtsl *vtljml *nzlks *qszmzsh *lqmfgp *pbn *cmnb *rpcdfph *kx *qkgqv *tshn *zlgztsbd *xlnn
+["eggs"]: mrfxh zrgzf thvm qrsczjv jmdg zmb hlmvqh *gsgmdn *zqsc *cxzkmr *xlnn *htllnq *vbqbkt *pgb *pnglkx *tphtz *jmgt *qkgqv *pjqdmpm *glrc *sdccxkt *rbvdt *vht *pzxj *fstgc *bcvmz *mjpt *dvcfx *vpvj *ljmvpp *pfqxsxd *tshn *zmcj *qmmt *pcf *dpfphd *xxfgvz *jxjqp *rczbvg *mgxzl *fjgxv *hnmjfl *rkzhxmh *cnghsg *zfml *gjqfj *tbm *lh *mppf *dcbk *zntrfp *dbx *jvvmcq *szsbj *pjln *xhmmt *rcr *nthhxn *kx *fmvvb *xzcdnr *klx *rpcdfph *djpsmd *jdtzr *mnvq *bjvcg *mrxg
+["peanuts", "eggs", "soy"]: thvm mrfxh zmb hlmvqh jmdg ckqq qrsczjv *vqrjn *rhrc *pzxj *pjqdmpm *tshn *pjln *nggcjr *ljhn *fkh *qchnn *kfsfn *vgjbgj *jmgt *qkgqv *stcsp *knnmm *dznd *pgb *csfmx *fmvvb *ltvr *rknm *rpcdfph *qfvfzg *zfcvnj *clqk *kx *ghr *rpmmv *vbqbkt *tfmgl *dfrg *lxr *hrfmdk *vpgvm *zlgztsbd *rczbvg *tvqbhv *jnr *qjsbk *qfkjsq *xxfgvz *klx *dnpgcd *kbtx *flhfddq *jfqqgtl *ddrd *xgbvk *rqqfnlc *bnzq *mnvq *ncqdr *dln *qdpbx *kltcm *mppf *zttx *dbx *pmtfmv *klmjmz *vnmfg *pgqxp *nthhxn *crnfzr *dmxhhd *xhmmt *rgdx *mvnqdh *gsgmdn *nzlks *xzcdnr *fbcds *djpsmd *zfsks *dpfphd *lh *ddbmq *vfkpj *vgp
+["shellfish", "dairy", "nuts"]: hlmvqh zmb thvm ckqq qrsczjv mrfxh jmdg *dsmc *rqqfnlc *dgrrm *lbskg *xxfgvz *klmjmz *jmgt *jnr *dznd *npbnj *rrbndl *fkh *vfkpj *dvcfx *hnmjfl *qrftr *pmtfmv *kltcm *xzcdnr *gtgrcf *lbfgp *bcvmz *xddkbd *vgjbgj *gjqfj *kglr *qchnn *zlgztsbd *rcvd *xmjlsn *bnzq *kbtx *vnfmc *srgnx *pptgt *llgsg *cbbkfx *cnghsg *xjzc *rbvdt *mnvq *mppf *rknm *tzjnvp *rfh *vgp *vpvj *nfnzx *hkxcb *zqsc *lqmfgp *kmsh *dnpgcd *sjgx *sfk *gmc *jfqqgtl *ltvr *vpgvm *pmvl *qmthj *klx *tbm *rvchbn *pfqxsxd *xjdhk *glrc *rczbvg *knqzf
+["peanuts", "shellfish"]: qrsczjv mrfxh ckqq zrgzf thvm zmb hlmvqh *ngqh *lxr *qrftr *nldzpc *cbbkfx *zdntns *xxfgvz *srgnx *qspfqb *zfsks *tzjnvp *tphtz *lbfgp *gjqfj *xjrpr *qfkjsq *rfh *xgbvk *dtlhh *xjdhk *qkgqv *hkqp *dsmc *rczbvg *klmjmz *xlzqfb *ddgdhg *kltcm *vhqfz *kglr *jxjqp *xddkbd *htllnq *gtgrcf *lbskg *gmc *szsbj *zfcvnj *pjqdmpm
+["peanuts", "eggs", "dairy"]: jmdg ckqq qrsczjv zmb hlmvqh thvm zrgzf *xlzqfb *vpgvm *flhfddq *kbtx *zmcj *vhqfz *tphtz *vqrjn *stcsp *rgdx *nfnzx *nggcjr *xmjlsn *pgb *ngqh *pjqdmpm *qsgb *nldzpc *hkxcb *klmjmz *rpmmv *xjrpr *zlgztsbd *ncqdr *rpcdfph *qjsbk *gzgvdh *xnfhq *cbbkfx *knnmm *qfkjsq *xddkbd *vgp *pmtfmv *qdpbx *cnghsg *hrfmdk *fjgxv *xlnn *xjzc *mszc *ljmvpp *zntrfp *fdf *pcf *mnvq *bkd *fbcds *dbx *fstgc *dln *pfqxsxd *mhrm *pbn *zttx *zhghprj
+["sesame"]: jmdg zmb qrsczjv hlmvqh zrgzf thvm mrfxh *nldzpc *gmc *mjpt *knqzf *rbvdt *zntrfp *nthhxn *rxr *xzcdnr *kx *ljmvpp *kltcm *jmgt *gjqfj *pgqxp *xjrpr *dbx *dmxhhd *pnglkx *gsgmdn *vhcnpg *xjzc *pjqdmpm *rpcdfph *lbfgp *xgbvk *jvvmcq *qdpbx *nqfc *dvcfx *rknm *kbtx *npbnj *mrxg *klmjmz *rrbndl *xbpb *ncqdr *fdf *vpvj *kglr *pptgt
+["shellfish", "nuts"]: ckqq jmdg mrfxh zrgzf thvm zmb qrsczjv *tshn *dmxhhd *qmthj *kqzcj *rqqfnlc *pcf *dgrrm *hkqp *flhfddq *qmmt *thcs *vqrjn *vht *tbm *lqmfgp *bcvmz *fbcds *rbvdt *xzcdnr *xlzqfb *vfkpj *sdccxkt *fstgc *fhtsl *qfvfzg *kmsh *dznd *bxv *glrc *pmtfmv *rkzhxmh *zqsc *xjzc *fmvvb *ddbmq *qspfqb *tjsdp *rcvd *xgbvk *gzgvdh *cmnb *pptgt *ngqh *xlnn *sjgx *mrxg *qdpbx *rknm *hnmjfl *szsbj *zntrfp *gtgrcf *fdf *kltcm *vhcnpg *pjln *mppf *dnpgcd *ttxx *srgnx *qszmzsh
+removing ("dairy", "thvm")
+removing ("sesame", "zmb")
+removing ("peanuts", "hlmvqh")
+removing ("wheat", "zrgzf")
+removing ("eggs", "jmdg")
+removing ("soy", "ckqq")
+removing ("nuts", "qrsczjv")
+removing ("shellfish", "mrfxh")
+Day 21 - Part 2: thvm,jmdg,qrsczjv,hlmvqh,zmb,mrfxh,ckqq,zrgzf
+	generator: 358.788µs,
+	runner: 1.783195ms
+
+Day 22 - Part 1: 32033
+	generator: 120ns,
+	runner: 7.289µs
 
 ```

2020/input/2020/day19.txt

@@ -0,0 +1,561 @@
+102: 100 47 | 76 84
+23: 60 47 | 73 84
+132: 17 47 | 81 84
+108: 55 100
+18: 116 47 | 26 84
+103: 84 115 | 47 81
+65: 84 113 | 47 50
+128: 107 47 | 125 84
+14: 84 100 | 47 107
+118: 47 17 | 84 57
+2: 47 100 | 84 40
+28: 63 84 | 74 47
+22: 102 84 | 123 47
+123: 84 74
+19: 3 47 | 13 84
+24: 74 47 | 81 84
+115: 55 55
+90: 92 47 | 44 84
+48: 84 94 | 47 96
+109: 17 84 | 100 47
+92: 84 75 | 47 108
+66: 38 47 | 125 84
+83: 66 47 | 108 84
+31: 121 84 | 77 47
+29: 47 61 | 84 111
+45: 47 47 | 47 84
+59: 47 49 | 84 43
+37: 47 30 | 84 95
+36: 107 84 | 125 47
+82: 74 84 | 38 47
+61: 84 10 | 47 110
+79: 47 28 | 84 109
+33: 101 47 | 133 84
+12: 45 47 | 63 84
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+122: 65 47 | 52 84
+21: 57 84 | 115 47
+8: 42
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+39: 113 84 | 81 47
+41: 84 124 | 47 10
+50: 47 47 | 84 84
+17: 47 84 | 84 84
+120: 98 84 | 78 47
+113: 55 47 | 47 84
+20: 84 128 | 47 104
+7: 84 1 | 47 20
+51: 84 113 | 47 81
+56: 84 83 | 47 69
+131: 84 127 | 47 97
+0: 8 11
+5: 47 63 | 84 125
+94: 15 84 | 127 47
+121: 99 47 | 27 84
+119: 47 115 | 84 57
+129: 47 80 | 84 131
+15: 47 100 | 84 45
+35: 84 50 | 47 76
+95: 47 115 | 84 107
+68: 127 84 | 51 47
+124: 84 107
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+13: 47 33 | 84 129
+53: 106 47 | 59 84
+106: 16 84 | 118 47
+89: 84 125 | 47 45
+104: 45 84 | 76 47
+99: 47 56 | 84 7
+78: 84 74 | 47 81
+64: 17 47 | 115 84
+32: 50 84 | 40 47
+1: 47 24 | 84 72
+47: "a"
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+88: 47 119 | 84 132
+105: 47 125 | 84 100
+6: 68 84 | 67 47
+110: 76 84 | 63 47
+38: 84 84 | 84 47
+49: 47 63 | 84 76
+26: 55 107
+81: 47 84
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+77: 47 86 | 84 71
+135: 32 84 | 2 47
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+42: 19 84 | 62 47
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+27: 6 47 | 91 84
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+62: 84 87 | 47 23
+76: 84 84
+4: 84 135 | 47 54
+60: 41 47 | 37 84
+100: 47 47 | 84 47
+85: 47 112 | 84 18
+116: 125 84 | 63 47
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+34: 52 47 | 25 84
+40: 47 47
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+3: 29 47 | 130 84
+114: 17 84 | 107 47
+52: 47 45 | 84 74
+10: 47 100 | 84 81
+98: 47 76 | 84 100
+112: 84 82 | 47 103
+72: 40 47 | 45 84
+126: 50 84 | 113 47
+107: 84 47 | 47 84
+11: 42 31
+55: 84 | 47
+54: 12 84 | 5 47
+130: 34 47 | 70 84
+84: "b"
+127: 81 47 | 17 84
+87: 84 53 | 47 9
+101: 105 84 | 14 47
+9: 88 84 | 120 47
+73: 47 79 | 84 22
+97: 74 84 | 50 47
+117: 74 47
+70: 47 134 | 84 46
+58: 47 50 | 84 115
+125: 47 47 | 55 84
+46: 47 81 | 84 17
+86: 84 90 | 47 85
+25: 38 84 | 63 47
+69: 39 47 | 78 84
+43: 47 100 | 84 125
+93: 84 66 | 47 35
+44: 47 21 | 84 36
+16: 57 47 | 107 84
+71: 48 84 | 4 47
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2020/input/2020/day21.txt

@@ -0,0 +1,45 @@
+pnglkx nfnzx tjsdp jkbqk rpmqq gzgvdh rgdx szsbj xjdhk zfml ddbmq thvm mvnqdh gsgmdn dtlhh rqqfnlc bxv nthhxn hnmjfl ckqq qrsczjv fkh hkxcb rpcdfph flhfddq qspfqb zmb rpmmv zrgzf jfqqgtl xxfgvz kltcm xjrpr vnfmc xhmmt zkzdrn jmdg xgbvk ngqh hlmvqh djpsmd bnzq rbvdt tfmgl pjln (contains sesame, nuts)
+qchnn dnpgcd zfml thvm gsgmdn frld nfnzx nqfc xbpb kltcm ljmvpp mrfxh zntrfp gzgvdh rrbndl pptgt rknm qsgb mstc ckqq zzldmh nggcjr bkd zfsks hlmvqh cxzkmr zmb tzjnvp npbnj lh pfqxsxd clqk rpmmv szsbj mnvq cnghsg jdtzr kfsfn jxjqp knqzf lvjpp qdpbx qrsczjv xxfgvz ngqh zrgzf jvvmcq zmcj dsmc xhmmt (contains sesame)
+hlmvqh klmjmz clqk qrsczjv pjln lvjpp tbm thvm rqqfnlc gzgvdh klx sfk bnzq mhrm vht pjqdmpm tfmgl cxzkmr ghr rxrgtvs rfh rhrc vnfmc ljhn fbcds rkzhxmh htllnq zrgzf xhmmt rcr dgrrm xlzqfb xlnn ckqq vpgvm zntrfp jmdg pgqxp xjrpr vnmfg vqrjn thcs mnvq rczbvg bkd zqsc ngqh rpmqq zmcj cbbkfx rpcdfph mrfxh jfqqgtl mszc tzjnvp sdccxkt rcvd pcf xzcdnr jgtrnm zfcvnj dsmc gjqfj gtgrcf nthhxn jngghk hnmjfl qspfqb bxv (contains eggs)
+nthhxn htllnq pbn qsgb mrfxh zrgzf dvcfx mstc jngghk xddkbd dpfphd zhghprj rfh ljmvpp vtljml pmtfmv zmb xxfgvz crnfzr xbpb jmdg tshn nqfc kmsh rknm hkqp pjqdmpm pjln ddbmq bjvcg zntrfp vnfmc qszmzsh fhtsl tjsdp kfsfn jkbqk thvm mnvq dnpgcd xzcdnr xjrpr rbvdt vht jxjqp zzldmh cnghsg pzxj jfqqgtl ckqq kqzcj lxr glrc dgrrm cxzkmr clqk xjdhk hlmvqh vpvj lbfgp klmjmz (contains dairy, peanuts, eggs)
+rqqfnlc vgp tbm tjsdp tshn zzldmh zrgzf vgjbgj pptgt xnfhq pbn rpmmv dnpgcd qszmzsh rbvdt nzlks xddkbd thvm npbnj lxr szsbj dtlhh mrfxh ljmvpp xjzc zmb pjqdmpm rknm rrbndl xhmmt hlmvqh jmdg pjln pfqxsxd jdtzr jnr jkbqk vht vhcnpg ckqq ddgdhg pzxj ljhn xgbvk qfkjsq zhghprj gzgvdh xzcdnr ddbmq rcvd lbfgp mvnqdh rfh nggcjr gjqfj hrfmdk (contains dairy)
+cmnb cnghsg cxzkmr vfkpj pgb xddkbd qfvfzg gzgvdh bxv zfml clqk pbn nthhxn jmdg ckqq rvchbn xbpb sfk dtlhh rqqfnlc rhrc djpsmd qrftr gjqfj bjvcg zntrfp qrsczjv thvm zlgztsbd lbfgp vnmfg jkbqk lvjpp pfqxsxd ljmvpp mrfxh mnvq ljhn fkh ddrd hlmvqh qmmt rcr vht xgbvk ddbmq tbm vhcnpg srgnx zrgzf ngqh mhrm pptgt glrc rpmmv kx htllnq (contains soy, shellfish)
+fdf tshn zhghprj xjzc xxfgvz nggcjr hkqp vgjbgj ckqq hnmjfl mstc dmxhhd rpmmv jdtzr klx ngqh gtgrcf bjvcg vgp jgtrnm ttxx bcvmz pgqxp nfnzx sjgx zfcvnj tzjnvp qmmt jmdg qdpbx zmb rhrc gmc zfsks ljmvpp gjqfj fjgxv zttx lbskg vnfmc vfkpj lxr hkxcb dln xbpb sfk vpgvm thvm ljhn rknm rfh mgxzl thcs jfqqgtl bkd sdccxkt zzldmh mrfxh rcvd qchnn xhmmt rkzhxmh xgbvk csfmx zrgzf qrsczjv gzgvdh ncqdr rxr vtljml lbfgp pzxj djpsmd dpfphd rczbvg knnmm xmjlsn (contains nuts, dairy, sesame)
+klx hkqp lqmfgp mstc mgxzl cxfzhj xxfgvz qrsczjv jxjqp ljhn pcf mrxg jmdg bjvcg vht lbskg tphtz nldzpc tjsdp mszc hlmvqh sfk dln ghr mppf lbfgp zkzdrn qdpbx bnzq qsgb rrbndl nggcjr zttx qjsbk llgsg srgnx dbx stcsp rcr zfml jvvmcq pptgt gmc fkh xjdhk pzxj zntrfp flhfddq knqzf ddrd jmgt fdf thcs lh mrfxh xmjlsn kglr pjqdmpm kx dpfphd vqrjn vhcnpg rxrgtvs pfqxsxd nqfc ckqq cbbkfx dtlhh thvm zmb qmmt xlzqfb rpmmv jfqqgtl gsgmdn bcvmz mnvq fbcds xjzc gtgrcf (contains nuts, sesame)
+gzgvdh vbqbkt fjgxv nggcjr jvvmcq pptgt fmvvb zqsc hlmvqh rbvdt llgsg xddkbd rfh pjln tzjnvp glrc zmb rqqfnlc zttx qrsczjv rrbndl qfkjsq mppf rxrgtvs lvjpp dtlhh zfml stcsp zkzdrn vtljml qdpbx zrgzf fstgc xlnn sdccxkt hkxcb kltcm xlzqfb jfqqgtl npbnj bcvmz rknm ngqh xbpb rcr thvm kglr dbx xxfgvz bjvcg rpmmv srgnx ckqq gjqfj tshn gmc vgp dgrrm ljhn knnmm qkgqv mstc pnglkx flhfddq tjsdp jmdg zntrfp vgjbgj bkd (contains soy)
+qjsbk fkh xddkbd fjgxv lbfgp rxr ckqq tphtz vhcnpg klmjmz pmtfmv jmdg hrfmdk dbx fbcds jnr xxfgvz pfqxsxd qfvfzg bxv flhfddq rknm rpmqq pjln sdccxkt pgb klx jdtzr zmb thvm hlmvqh lxr zrgzf nthhxn vnmfg jgtrnm nfnzx zzldmh ddbmq nldzpc tvqbhv dznd dnpgcd cmnb vpvj sjgx xjzc hkxcb szsbj dcbk pmvl pjqdmpm mhrm rgdx jfqqgtl zttx vtljml mrfxh cbbkfx knqzf mszc jkbqk xbpb vgjbgj pptgt vfkpj vqrjn zhghprj xnfhq tshn rcvd xjdhk djpsmd rfh glrc rkzhxmh (contains wheat, dairy)
+mvnqdh nqfc bjvcg ckqq zfcvnj jmdg ljhn hkqp srgnx zfsks bxv xbpb rkzhxmh cxfzhj rpmqq zdntns dnpgcd thcs lvjpp klx jngghk flhfddq gmc pjln dcbk cbbkfx vbqbkt qchnn tshn fhtsl qmthj jvvmcq ncqdr jmgt csfmx qrsczjv tzjnvp rczbvg rcr hlmvqh rbvdt gtgrcf thvm cnghsg zrgzf rxrgtvs zmb (contains peanuts, soy)
+ckqq frld mvnqdh tphtz bjvcg xzcdnr djpsmd ttxx dcbk qdpbx tshn rczbvg vpvj qmmt ddrd dln bxv zrgzf jxjqp lh mgxzl qrsczjv ltvr pbn nggcjr dsmc llgsg knnmm pzxj cnghsg thvm vnmfg mhrm xlnn gjqfj pptgt jkbqk htllnq jmdg xnfhq klx jmgt mrfxh rxr hnmjfl lqmfgp qrftr mppf sjgx rvchbn lvjpp mstc zqsc gmc kmsh rpmmv crnfzr hrfmdk kglr hlmvqh cxzkmr dvcfx (contains shellfish, eggs, dairy)
+xjrpr mjpt cbbkfx rpmqq ljhn jmdg vht sdccxkt ngqh bnzq jgtrnm fmvvb mrfxh xxfgvz jfqqgtl tfmgl bcvmz pgqxp thvm crnfzr xddkbd zfsks qrsczjv pzxj tshn fbcds lbfgp thcs hkqp gsgmdn dvcfx zmb cnghsg csfmx vhqfz rxr bxv xjdhk zhghprj dtlhh ckqq qmthj jxjqp rczbvg gmc sfk ttxx ltvr pnglkx dnpgcd qsgb clqk klmjmz lh rvchbn pjln knqzf vnfmc qspfqb nthhxn zqsc mhrm gzgvdh ncqdr zrgzf ddrd vqrjn (contains nuts, shellfish)
+rvchbn vhcnpg mstc zrgzf hkqp bnzq xbpb qrsczjv fhtsl fjgxv ddgdhg jfqqgtl rpmqq dpfphd pcf qrftr ngqh vht dvcfx dfrg tphtz mnvq qjsbk mvnqdh zntrfp xjzc jmgt xzcdnr vnfmc xddkbd fkh kmsh xmjlsn ckqq zfsks bcvmz ljhn gmc rrbndl fmvvb cxzkmr lh zdntns pgb thvm xxfgvz hrfmdk dln mrfxh tvqbhv cnghsg vpgvm hlmvqh mjpt jdtzr dgrrm kglr pgqxp kqzcj hkxcb xgbvk djpsmd tshn klmjmz rfh xlnn bjvcg qfkjsq rkzhxmh glrc clqk gjqfj jmdg knqzf ljmvpp csfmx rbvdt zfcvnj dsmc fstgc (contains dairy)
+nthhxn vnfmc dsmc vpvj rhrc zfcvnj zdntns qmthj knnmm rpmmv dtlhh qdpbx zhghprj xddkbd mrfxh rqqfnlc dpfphd xhmmt dgrrm pgqxp zmb gmc flhfddq zkzdrn hlmvqh qrsczjv vhcnpg mjpt fbcds thvm ncqdr pjln zttx hrfmdk xlnn dvcfx fkh mszc klx cmnb zfml zrgzf mnvq rcr bjvcg csfmx xlzqfb ckqq (contains sesame, shellfish)
+xnfhq hlmvqh lh qdpbx rpcdfph qsgb rpmqq tjsdp ljhn gsgmdn vfkpj jmdg xlzqfb ckqq qmmt jmgt dvcfx zrgzf bkd pmvl ngqh sjgx dpfphd kfsfn mrfxh bjvcg jkbqk qrftr mjpt vnmfg nldzpc ncqdr jvvmcq pptgt pjqdmpm thvm pjln ddrd csfmx kglr xgbvk tzjnvp bxv htllnq fstgc zfcvnj jxjqp pbn dsmc kbtx vqrjn rqqfnlc rxrgtvs hnmjfl qrsczjv (contains eggs)
+mvnqdh klx rbvdt kx qmthj hrfmdk bcvmz fhtsl zrgzf xxfgvz pmvl csfmx hkxcb rpmqq vpvj jmgt vbqbkt lxr hlmvqh zhghprj kglr dpfphd xzcdnr mszc vgp dvcfx gzgvdh ncqdr mppf nldzpc djpsmd pnglkx mrfxh lqmfgp sjgx jfqqgtl dln vhcnpg npbnj cmnb hnmjfl kfsfn vtljml qspfqb xlzqfb dcbk jngghk lh jxjqp rxr jdtzr qrftr fbcds thvm mrxg zzldmh qfvfzg dtlhh hkqp dsmc qdpbx cxzkmr tfmgl xjrpr pjqdmpm rczbvg rcvd lbfgp jmdg qszmzsh glrc qkgqv tvqbhv qrsczjv fkh rknm ckqq zntrfp cbbkfx (contains shellfish, dairy)
+zqsc zmb sfk thvm lvjpp ddgdhg qrsczjv qspfqb dmxhhd zzldmh xzcdnr xjdhk dznd qfvfzg ljhn ghr zrgzf bcvmz frld pnglkx fhtsl srgnx jfqqgtl fdf vhqfz qsgb jkbqk ckqq xxfgvz pjqdmpm rpmqq jmdg fkh crnfzr mjpt cnghsg qrftr xddkbd rkzhxmh pfqxsxd mhrm gtgrcf hlmvqh fmvvb tvqbhv dgrrm xbpb qmthj gjqfj kqzcj tshn qkgqv vfkpj kmsh pgqxp ddrd glrc xgbvk hrfmdk rgdx bnzq knnmm qchnn vnmfg ncqdr qfkjsq pmtfmv xnfhq sjgx cbbkfx stcsp rbvdt mstc gzgvdh kglr dsmc rrbndl xjzc rpcdfph (contains nuts)
+rbvdt jmdg zkzdrn zmb hnmjfl gmc pgqxp lqmfgp knqzf xbpb fmvvb bkd dgrrm vgjbgj dcbk ttxx dtlhh vpgvm xlnn hlmvqh jgtrnm dpfphd qrsczjv xzcdnr jngghk qmmt thvm flhfddq gzgvdh crnfzr qszmzsh xlzqfb dfrg qspfqb qmthj rpcdfph frld zqsc xjdhk dmxhhd ljhn qchnn bnzq kltcm gtgrcf mszc zhghprj rhrc csfmx mrxg klmjmz lbskg ckqq pzxj nggcjr nthhxn nldzpc rpmqq dbx mhrm zrgzf xjzc (contains dairy, wheat, eggs)
+lh sfk jvvmcq szsbj fmvvb xxfgvz sjgx jnr vqrjn gmc cnghsg qsgb jmdg mppf jfqqgtl fjgxv vbqbkt zqsc xgbvk pgqxp nqfc jmgt rfh xlnn rhrc nfnzx rpcdfph qszmzsh kglr zmb xnfhq thvm tbm zzldmh rcvd pmvl kqzcj hnmjfl nggcjr qrsczjv qchnn zmcj rvchbn fdf xmjlsn mnvq mgxzl rkzhxmh bxv ngqh xlzqfb gjqfj sdccxkt clqk cmnb rbvdt jkbqk dpfphd mrfxh hlmvqh kltcm ckqq jngghk mszc (contains sesame)
+zfcvnj mvnqdh gjqfj htllnq nggcjr vtljml qrftr fstgc xjrpr dvcfx klmjmz thvm qjsbk rcvd hrfmdk rczbvg mjpt ncqdr kbtx nqfc xxfgvz xlzqfb mrfxh zmb jkbqk jmgt rxrgtvs qspfqb rhrc qmthj mszc ghr fmvvb cxfzhj lqmfgp ckqq zrgzf vfkpj tzjnvp mhrm vpvj pgqxp ngqh xlnn hlmvqh xnfhq tbm zqsc jvvmcq rvchbn lxr qrsczjv vgp cmnb pjqdmpm (contains dairy)
+qfvfzg ngqh rhrc nthhxn mvnqdh rcr knnmm zmcj nfnzx stcsp nzlks qdpbx kfsfn nldzpc mrfxh cxzkmr fkh vpvj llgsg pgb cmnb ncqdr qchnn zrgzf rknm xjzc zntrfp mstc clqk gsgmdn jnr ljhn mppf hkqp jmdg xlnn xgbvk csfmx rpmmv fmvvb mjpt thvm zlgztsbd dtlhh dln bnzq klmjmz tfmgl vgp qmmt kglr dbx gzgvdh rcvd kmsh rgdx kqzcj ttxx tzjnvp qmthj hlmvqh zfsks qrsczjv lh vhcnpg pgqxp zmb zhghprj vht rxr vbqbkt pcf gtgrcf zzldmh dvcfx (contains wheat)
+vfkpj kbtx qkgqv bkd srgnx rcr zdntns tjsdp kfsfn rhrc mstc vtljml zlgztsbd rbvdt zrgzf glrc qfvfzg rkzhxmh ddbmq pbn flhfddq dfrg kglr clqk rxrgtvs cxzkmr mrfxh ddgdhg cmnb hlmvqh rpmmv dln zttx pjln zmb pjqdmpm jmgt ckqq qdpbx rcvd thvm rrbndl vbqbkt xmjlsn lh xhmmt qmthj nzlks pgb xzcdnr mrxg xgbvk fkh vgp rqqfnlc gjqfj gsgmdn tbm szsbj bxv lxr cnghsg jfqqgtl dbx pmtfmv lvjpp xjzc xlnn dtlhh dsmc vnfmc qrsczjv zkzdrn ghr fhtsl (contains dairy, wheat, peanuts)
+nldzpc pbn rxr vgp zmb pgqxp zfsks vfkpj tvqbhv qmmt pjln jmdg qfkjsq hnmjfl mrxg hlmvqh dln nqfc lbfgp rcr kfsfn vtljml rxrgtvs tbm dsmc hkqp lh jngghk vbqbkt thvm fbcds clqk pjqdmpm ckqq mppf tzjnvp xhmmt csfmx rpcdfph sdccxkt kbtx knqzf rkzhxmh qrsczjv mszc ttxx klx mrfxh mnvq (contains dairy, sesame)
+rgdx tfmgl gmc fstgc ltvr ckqq pnglkx kglr hkqp ddgdhg qfkjsq xzcdnr jnr xxfgvz hlmvqh zhghprj ghr pfqxsxd ljmvpp zmb cmnb nldzpc dznd xlnn zrgzf lh zfcvnj dcbk kmsh xjrpr qjsbk nzlks gtgrcf kfsfn dpfphd rqqfnlc mppf zzldmh thcs cbbkfx jmgt rcr pjln mrfxh jxjqp fmvvb pmvl mgxzl knqzf rbvdt gzgvdh jmdg qrsczjv nqfc vnmfg qszmzsh tjsdp ljhn qrftr ddbmq bkd fbcds (contains wheat, peanuts)
+clqk rpmmv rkzhxmh pbn mrfxh pmvl hkxcb mvnqdh kbtx tzjnvp ncqdr kmsh dcbk zrgzf qchnn bkd kqzcj hlmvqh thvm cmnb mjpt knnmm pzxj frld gsgmdn pfqxsxd ltvr lqmfgp fkh rbvdt vgjbgj nldzpc jgtrnm dbx qrftr zdntns lbskg rpcdfph djpsmd vbqbkt dsmc jdtzr qmthj zmb hnmjfl sfk mppf fmvvb rcr xmjlsn qrsczjv csfmx dln vqrjn xbpb stcsp fdf rxrgtvs mstc jmdg ljhn npbnj thcs ddbmq knqzf dgrrm rqqfnlc mszc jnr lbfgp qsgb dtlhh pgb bcvmz qszmzsh rfh gjqfj xlzqfb rxr (contains peanuts)
+clqk csfmx lvjpp kqzcj thvm zntrfp dcbk ghr vtljml pfqxsxd pjqdmpm jgtrnm flhfddq zzldmh llgsg nthhxn mjpt zrgzf pjln dznd mnvq bjvcg nfnzx tzjnvp vgp dtlhh qmmt rpmmv jmdg zfcvnj xzcdnr zmb tbm dbx bxv cxzkmr tfmgl mszc ttxx qkgqv qjsbk ckqq pgqxp zfml mhrm vpvj jdtzr mgxzl tvqbhv qfvfzg vhcnpg lbskg lqmfgp cnghsg rcvd hnmjfl zhghprj hlmvqh xjrpr xxfgvz dln gtgrcf sdccxkt kx qspfqb jfqqgtl pptgt dmxhhd rpcdfph fstgc rcr fmvvb ljmvpp mrxg gmc pgb mrfxh kmsh cmnb (contains soy, wheat, eggs)
+klx nggcjr xjrpr zdntns kltcm vhcnpg xlnn kqzcj hlmvqh dnpgcd vht rpmmv bnzq hnmjfl lbskg fdf bkd dgrrm rvchbn mgxzl pgb jdtzr dcbk qszmzsh rpmqq hrfmdk qrftr dpfphd lxr ngqh xddkbd qrsczjv tbm vqrjn qchnn vpvj mstc ckqq pbn zrgzf jxjqp jgtrnm tfmgl zmb rqqfnlc xmjlsn rxr pmtfmv zmcj zfsks zqsc crnfzr jmdg fbcds mrfxh xgbvk hkxcb gmc nldzpc nfnzx xnfhq (contains peanuts, eggs, nuts)
+csfmx zzldmh dcbk fdf rhrc fjgxv qchnn cxzkmr qmthj crnfzr nqfc zmcj mhrm ltvr sdccxkt flhfddq cbbkfx cmnb qdpbx thvm xmjlsn fhtsl knqzf bxv nggcjr vnmfg zmb cxfzhj jdtzr pnglkx jmdg lxr kmsh vgjbgj mrfxh dln mppf gzgvdh rpmmv zntrfp zrgzf pgqxp ckqq zfml vnfmc vht pmvl xlzqfb rxrgtvs kltcm pzxj dsmc dtlhh hrfmdk qmmt dnpgcd bjvcg gsgmdn cnghsg xhmmt gmc ttxx qjsbk hlmvqh fkh vhqfz xxfgvz (contains dairy, sesame, eggs)
+jmgt mppf ttxx dsmc xnfhq bxv kglr bcvmz ckqq jmdg dfrg jnr mnvq ngqh sfk fdf xhmmt fjgxv zfcvnj rczbvg cmnb xjrpr szsbj dvcfx gtgrcf knqzf pjln mrfxh lbfgp vnmfg jdtzr mhrm fstgc tbm djpsmd pnglkx qkgqv zmb vfkpj hkxcb qfkjsq pgqxp xzcdnr nfnzx npbnj rbvdt jfqqgtl hlmvqh qfvfzg jvvmcq hnmjfl thvm rgdx gjqfj zhghprj kqzcj rcr zrgzf tvqbhv tshn (contains peanuts)
+rknm lvjpp cnghsg qrsczjv sdccxkt zrgzf rcvd rxrgtvs stcsp thvm fstgc ttxx pmvl rpcdfph dznd ckqq pptgt mstc rpmmv fdf knnmm jnr bjvcg mnvq qdpbx zfml rqqfnlc zqsc zhghprj mgxzl qmmt fkh rxr dsmc lbskg sfk xhmmt kqzcj vfkpj mhrm hlmvqh mrfxh pcf zmb jmgt ljmvpp jfqqgtl szsbj xjrpr vnfmc qszmzsh dbx mszc xlnn qrftr qchnn mjpt zttx ddgdhg gmc djpsmd zfcvnj dln qkgqv rcr dnpgcd tzjnvp hkxcb zmcj lxr bcvmz fhtsl vnmfg vpgvm (contains dairy, sesame)
+rgdx jmdg cmnb thvm fstgc pfqxsxd ncqdr dmxhhd glrc xjrpr rkzhxmh fhtsl mrfxh hkxcb pmtfmv zfsks knnmm pgb vnmfg thcs dfrg ddbmq clqk zntrfp nthhxn xjzc dgrrm lvjpp rpmmv vht lh jfqqgtl vgp mszc rczbvg jnr jngghk xhmmt vhqfz bcvmz zmb ckqq tjsdp bkd xlzqfb xddkbd pmvl qrsczjv ddgdhg djpsmd ttxx zfcvnj mjpt nldzpc qrftr kx xnfhq fjgxv jmgt ljhn mrxg pbn sdccxkt rxrgtvs dln dpfphd zrgzf tbm rfh tvqbhv (contains sesame, dairy, shellfish)
+rczbvg cxfzhj lxr mgxzl hkxcb kbtx zmb jvvmcq pmtfmv jfqqgtl jxjqp mszc thvm rknm jmdg vfkpj qmmt hlmvqh ltvr cnghsg pjln mrfxh gzgvdh szsbj pgb dcbk lvjpp qchnn bcvmz sdccxkt llgsg xgbvk mrxg ghr zhghprj hkqp thcs zrgzf zzldmh ckqq frld gtgrcf pnglkx clqk kglr xhmmt hnmjfl qjsbk qfvfzg dnpgcd dbx djpsmd qrftr rgdx tvqbhv ncqdr (contains eggs)
+pmvl zmb zrgzf rxrgtvs mvnqdh dznd srgnx qmmt pgb jmdg hlmvqh dgrrm xjdhk klx rcvd qrsczjv cnghsg ttxx hrfmdk qspfqb pfqxsxd fmvvb pzxj sfk rbvdt nggcjr zqsc npbnj kglr xddkbd lbskg lqmfgp mrxg mrfxh zfml rkzhxmh jfqqgtl vgjbgj rpmmv tphtz mszc dln zfcvnj vpgvm tzjnvp rhrc nldzpc rknm tshn jgtrnm mppf fjgxv ckqq ddgdhg vpvj fbcds (contains shellfish)
+xlzqfb nthhxn dln rczbvg jmdg vgp cbbkfx gsgmdn jvvmcq glrc klmjmz stcsp bcvmz dbx vpvj cmnb sjgx rfh rrbndl mgxzl jnr rhrc thvm xlnn mhrm mrfxh bxv qrftr lvjpp fjgxv kglr cxfzhj zmb pptgt ghr kbtx pnglkx qjsbk ckqq jfqqgtl fstgc dznd qszmzsh jgtrnm zrgzf tjsdp klx pjln vgjbgj vbqbkt zkzdrn sfk qrsczjv vhqfz hrfmdk kltcm vnfmc zqsc xhmmt knnmm qfvfzg xjrpr nqfc jkbqk (contains nuts, sesame)
+jgtrnm bxv fbcds dznd bkd ttxx rpmqq ckqq pmvl dtlhh xjdhk zdntns knnmm vqrjn dsmc lqmfgp ltvr jfqqgtl mszc xhmmt szsbj crnfzr fkh rbvdt pjqdmpm nggcjr qrftr bcvmz qmmt srgnx xddkbd rvchbn zmb cmnb pptgt xjzc llgsg rxr bnzq gsgmdn thvm zzldmh rcvd mrfxh dgrrm zfsks qsgb tvqbhv zkzdrn nzlks lh klmjmz rxrgtvs kqzcj mnvq ngqh rczbvg tshn tjsdp hlmvqh pcf fdf rfh pnglkx hkqp zrgzf jkbqk sdccxkt fstgc vpvj ddbmq zttx xlzqfb qfvfzg frld qrsczjv zlgztsbd xnfhq pfqxsxd cxfzhj cxzkmr tphtz clqk (contains shellfish, peanuts)
+hrfmdk nthhxn lh zrgzf thvm rbvdt qdpbx mhrm vhqfz lqmfgp qjsbk vgp qfvfzg szsbj nldzpc vpgvm sdccxkt dgrrm tfmgl zdntns ddgdhg zfsks hlmvqh zmcj pnglkx ncqdr qrsczjv sfk mrfxh rqqfnlc vht mstc pmvl cmnb gmc ckqq jmdg thcs bjvcg nzlks klx jfqqgtl fkh ghr ddbmq htllnq xlnn kglr (contains nuts)
+fkh knqzf tvqbhv mrfxh hkqp nqfc mvnqdh xxfgvz gzgvdh vnfmc qrftr qrsczjv ngqh cxzkmr mjpt dvcfx zmcj xddkbd clqk rvchbn dsmc xjzc pfqxsxd dfrg qmmt mhrm flhfddq rrbndl xnfhq hlmvqh jmdg dznd frld jnr djpsmd thvm qjsbk ddbmq qchnn pnglkx dtlhh zhghprj fhtsl vtljml nzlks qszmzsh lqmfgp pbn cmnb rpcdfph kx qkgqv zrgzf tshn zmb zlgztsbd xlnn (contains eggs, nuts, dairy)
+gsgmdn zqsc cxzkmr xlnn htllnq vbqbkt pgb pnglkx tphtz jmgt mrfxh qkgqv pjqdmpm glrc sdccxkt rbvdt vht pzxj fstgc bcvmz mjpt dvcfx vpvj ljmvpp pfqxsxd tshn zmcj zrgzf qmmt pcf dpfphd xxfgvz jxjqp rczbvg mgxzl thvm fjgxv hnmjfl rkzhxmh qrsczjv jmdg cnghsg zfml gjqfj tbm lh mppf dcbk zntrfp dbx jvvmcq szsbj pjln xhmmt rcr nthhxn kx fmvvb xzcdnr klx rpcdfph zmb djpsmd jdtzr mnvq hlmvqh bjvcg mrxg (contains eggs)
+vqrjn rhrc pzxj pjqdmpm tshn pjln nggcjr ljhn fkh qchnn kfsfn vgjbgj jmgt qkgqv stcsp knnmm dznd pgb csfmx fmvvb ltvr rknm rpcdfph thvm mrfxh qfvfzg zfcvnj zmb clqk kx ghr rpmmv vbqbkt tfmgl dfrg lxr hrfmdk vpgvm zlgztsbd rczbvg tvqbhv jnr qjsbk qfkjsq xxfgvz hlmvqh klx dnpgcd kbtx flhfddq jfqqgtl jmdg ddrd xgbvk rqqfnlc ckqq bnzq mnvq ncqdr dln qdpbx kltcm mppf zttx dbx pmtfmv klmjmz vnmfg pgqxp nthhxn crnfzr dmxhhd xhmmt rgdx mvnqdh gsgmdn nzlks xzcdnr fbcds djpsmd zfsks dpfphd lh ddbmq vfkpj vgp qrsczjv (contains peanuts, eggs, soy)
+dsmc hlmvqh rqqfnlc dgrrm lbskg xxfgvz klmjmz jmgt jnr dznd npbnj rrbndl fkh vfkpj dvcfx hnmjfl qrftr pmtfmv kltcm xzcdnr gtgrcf lbfgp bcvmz xddkbd vgjbgj gjqfj kglr qchnn zlgztsbd rcvd xmjlsn bnzq kbtx vnfmc zmb srgnx pptgt llgsg thvm ckqq qrsczjv cbbkfx cnghsg xjzc rbvdt mnvq mrfxh mppf rknm jmdg tzjnvp rfh vgp vpvj nfnzx hkxcb zqsc lqmfgp kmsh dnpgcd sjgx sfk gmc jfqqgtl ltvr vpgvm pmvl qmthj klx tbm rvchbn pfqxsxd xjdhk glrc rczbvg knqzf (contains shellfish, dairy, nuts)
+ngqh lxr qrftr nldzpc cbbkfx zdntns xxfgvz srgnx qspfqb zfsks tzjnvp tphtz qrsczjv lbfgp gjqfj xjrpr qfkjsq rfh xgbvk dtlhh mrfxh xjdhk qkgqv hkqp dsmc rczbvg klmjmz ckqq xlzqfb ddgdhg kltcm vhqfz kglr jxjqp xddkbd htllnq gtgrcf zrgzf lbskg gmc szsbj thvm zmb zfcvnj hlmvqh pjqdmpm (contains peanuts, shellfish)
+xlzqfb vpgvm flhfddq kbtx zmcj jmdg vhqfz tphtz vqrjn stcsp ckqq rgdx nfnzx nggcjr qrsczjv xmjlsn pgb ngqh pjqdmpm qsgb nldzpc hkxcb klmjmz rpmmv xjrpr zlgztsbd ncqdr zmb rpcdfph qjsbk gzgvdh xnfhq hlmvqh cbbkfx knnmm qfkjsq xddkbd vgp pmtfmv qdpbx cnghsg hrfmdk fjgxv xlnn xjzc mszc ljmvpp zntrfp fdf pcf mnvq thvm bkd fbcds dbx fstgc dln pfqxsxd zrgzf mhrm pbn zttx zhghprj (contains peanuts, eggs, dairy)
+nldzpc gmc mjpt knqzf rbvdt zntrfp nthhxn jmdg rxr xzcdnr kx ljmvpp kltcm jmgt gjqfj pgqxp xjrpr zmb qrsczjv hlmvqh dbx dmxhhd pnglkx gsgmdn vhcnpg zrgzf xjzc pjqdmpm rpcdfph lbfgp xgbvk jvvmcq qdpbx nqfc dvcfx thvm rknm kbtx npbnj mrxg klmjmz rrbndl xbpb ncqdr fdf vpvj kglr pptgt mrfxh (contains sesame)
+tshn dmxhhd qmthj kqzcj rqqfnlc pcf dgrrm hkqp ckqq flhfddq qmmt thcs vqrjn vht tbm lqmfgp bcvmz fbcds jmdg rbvdt xzcdnr xlzqfb vfkpj mrfxh sdccxkt fstgc fhtsl qfvfzg kmsh dznd zrgzf bxv glrc thvm pmtfmv rkzhxmh zqsc xjzc fmvvb ddbmq qspfqb tjsdp rcvd xgbvk gzgvdh cmnb pptgt ngqh xlnn sjgx mrxg qdpbx rknm hnmjfl szsbj zntrfp gtgrcf fdf kltcm vhcnpg zmb pjln mppf dnpgcd ttxx qrsczjv srgnx qszmzsh (contains shellfish, nuts)

2020/input/2020/day22.txt

@@ -0,0 +1,53 @@
+Player 1:
+1
+43
+24
+34
+13
+7
+10
+36
+14
+12
+47
+32
+11
+3
+9
+25
+37
+21
+2
+45
+26
+8
+23
+6
+49
+
+Player 2:
+44
+5
+46
+18
+39
+50
+4
+41
+17
+28
+30
+42
+33
+38
+35
+22
+16
+27
+40
+48
+19
+29
+15
+31
+20

2020/input/2020/day23.txt

@@ -0,0 +1 @@
+872495136

2020/input/2020/day24.txt

@@ -0,0 +1,349 @@
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2020/input/2020/day25.txt

@@ -0,0 +1,2 @@
+12092626
+4707356

2020/src/day19.rs

@@ -48,6 +48,85 @@
 //! Your goal is to determine the number of messages that completely match rule 0. In the above example, ababbb and abbbab match, but bababa, aaabbb, and aaaabbb do not, producing the answer 2. The whole message must match all of rule 0; there can't be extra unmatched characters in the message. (For example, aaaabbb might appear to match rule 0 above, but it has an extra unmatched b on the end.)
 //!
 //! How many messages completely match rule 0?
+//!
+//! --- Part Two ---
+//! As you look over the list of messages, you realize your matching rules aren't quite right. To fix them, completely replace rules 8: 42 and 11: 42 31 with the following:
+//!
+//! 8: 42 | 42 8
+//! 11: 42 31 | 42 11 31
+//! This small change has a big impact: now, the rules do contain loops, and the list of messages they could hypothetically match is infinite. You'll need to determine how these changes affect which messages are valid.
+//!
+//! Fortunately, many of the rules are unaffected by this change; it might help to start by looking at which rules always match the same set of values and how those rules (especially rules 42 and 31) are used by the new versions of rules 8 and 11.
+//!
+//! (Remember, you only need to handle the rules you have; building a solution that could handle any hypothetical combination of rules would be significantly more difficult.)
+//!
+//! For example:
+//!
+//! 42: 9 14 | 10 1
+//! 9: 14 27 | 1 26
+//! 10: 23 14 | 28 1
+//! 1: "a"
+//! 11: 42 31
+//! 5: 1 14 | 15 1
+//! 19: 14 1 | 14 14
+//! 12: 24 14 | 19 1
+//! 16: 15 1 | 14 14
+//! 31: 14 17 | 1 13
+//! 6: 14 14 | 1 14
+//! 2: 1 24 | 14 4
+//! 0: 8 11
+//! 13: 14 3 | 1 12
+//! 15: 1 | 14
+//! 17: 14 2 | 1 7
+//! 23: 25 1 | 22 14
+//! 28: 16 1
+//! 4: 1 1
+//! 20: 14 14 | 1 15
+//! 3: 5 14 | 16 1
+//! 27: 1 6 | 14 18
+//! 14: "b"
+//! 21: 14 1 | 1 14
+//! 25: 1 1 | 1 14
+//! 22: 14 14
+//! 8: 42
+//! 26: 14 22 | 1 20
+//! 18: 15 15
+//! 7: 14 5 | 1 21
+//! 24: 14 1
+//!
+//! abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa
+//! bbabbbbaabaabba
+//! babbbbaabbbbbabbbbbbaabaaabaaa
+//! aaabbbbbbaaaabaababaabababbabaaabbababababaaa
+//! bbbbbbbaaaabbbbaaabbabaaa
+//! bbbababbbbaaaaaaaabbababaaababaabab
+//! ababaaaaaabaaab
+//! ababaaaaabbbaba
+//! baabbaaaabbaaaababbaababb
+//! abbbbabbbbaaaababbbbbbaaaababb
+//! aaaaabbaabaaaaababaa
+//! aaaabbaaaabbaaa
+//! aaaabbaabbaaaaaaabbbabbbaaabbaabaaa
+//! babaaabbbaaabaababbaabababaaab
+//! aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba
+//! Without updating rules 8 and 11, these rules only match three messages: bbabbbbaabaabba, ababaaaaaabaaab, and ababaaaaabbbaba.
+//!
+//! However, after updating rules 8 and 11, a total of 12 messages match:
+//!
+//! bbabbbbaabaabba
+//! babbbbaabbbbbabbbbbbaabaaabaaa
+//! aaabbbbbbaaaabaababaabababbabaaabbababababaaa
+//! bbbbbbbaaaabbbbaaabbabaaa
+//! bbbababbbbaaaaaaaabbababaaababaabab
+//! ababaaaaaabaaab
+//! ababaaaaabbbaba
+//! baabbaaaabbaaaababbaababb
+//! abbbbabbbbaaaababbbbbbaaaababb
+//! aaaaabbaabaaaaababaa
+//! aaaabbaabbaaaaaaabbbabbbaaabbaabaaa
+//! aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba
+//! After updating rules 8 and 11, how many messages completely match rule 0?
+
 use std::collections::HashMap;
 use std::fmt;
 
@@ -88,6 +167,7 @@ struct Resolver {
 
 impl Resolver {
     fn resolve(&mut self, e: &Entry) -> String {
+        assert_ne!(e, &Entry::Rule(0));
         if let Some(v) = self.resolved.get(e) {
             return v.to_string();
         }
@@ -104,8 +184,10 @@ impl Resolver {
                     .clone()
                     .iter()
                     .map(|rule| {
-                        let letters: Vec<_> = rule.iter().map(|e| self.resolve(e)).collect();
+                        rule.iter()
-                        letters.join("")
+                            .map(|e| self.resolve(e))
+                            .collect::<Vec<_>>()
+                            .join("")
                     })
                     .collect();
                 let s = subrules.join("|");
@@ -121,14 +203,30 @@ impl Resolver {
 }
 
 fn expand_rulemap(rule_map: HashMap<usize, Vec<Vec<Entry>>>) -> Regex {
+    // Hack
+    let part2 = rule_map.len() > 8 && rule_map[&8].len() > 1;
     let mut r = Resolver {
         rule_map,
         resolved: HashMap::new(),
     };
-    let rule_zero = r.rule_map[&0][0].clone();
+    let re = if part2 {
-    let re = rule_zero
+        let hack = (1..10_usize)
-        .iter()
+            .map(|i| {
-        .fold("".to_string(), |acc, e| format!("{}{}", acc, r.resolve(e)));
+                format!(
+                    "{}{}",
+                    r.resolve(&Entry::Rule(42)).repeat(i),
+                    r.resolve(&Entry::Rule(31)).repeat(i)
+                )
+            })
+            .collect::<Vec<_>>()
+            .join("|");
+        format!("({})+({})", r.resolve(&Entry::Rule(42)), hack)
+    } else {
+        let rule_zero = r.rule_map[&0][0].clone();
+        rule_zero
+            .iter()
+            .fold("".to_string(), |acc, e| format!("{}{}", acc, r.resolve(e)))
+    };
 
     Regex::new(&format!(r"^{}$", re)).unwrap()
 }
@@ -146,13 +244,7 @@ fn make_rules(lines: Vec<String>) -> Regex {
                 sub.split(' ')
                     .map(|p| match p.parse() {
                         Ok(n) => Entry::Rule(n),
-                        Err(_) => Entry::Char(
+                        Err(_) => Entry::Char(p[1..p.len() - 1].to_string()),
-                            p.strip_prefix("\"")
-                                .unwrap()
-                                .strip_suffix("\"")
-                                .unwrap()
-                                .to_string(),
-                        ),
                     })
                     .collect()
             })
@@ -162,8 +254,8 @@ fn make_rules(lines: Vec<String>) -> Regex {
     expand_rulemap(rules)
 }
 
-#[aoc_generator(day19)]
+#[aoc_generator(day19, part1)]
-fn generator(input: &str) -> Input {
+fn generator_part1(input: &str) -> Input {
     let mut it = input.split("\n\n");
     let rules = make_rules(
         it.next()
@@ -191,10 +283,51 @@ fn solution1(input: &Input) -> usize {
         .count()
 }
 
+#[aoc_generator(day19, part2)]
+fn generator_part2(input: &str) -> Input {
+    let mut it = input.split("\n\n");
+    let rules = make_rules(
+        it.next()
+            .unwrap()
+            .split('\n')
+            .map(|s| s.trim())
+            .map(|s| {
+                if s.starts_with("8:") {
+                    return "8: 42 | 42 8";
+                }
+                if s.starts_with("11:") {
+                    return "11: 42 31 | 42 11 31";
+                }
+                s
+            })
+            .map(|s| s.to_string())
+            .collect(),
+    );
+
+    let messages = it
+        .next()
+        .unwrap()
+        .split('\n')
+        .map(|s| s.trim().to_string())
+        .collect();
+    Input { rules, messages }
+}
+
+#[aoc(day19, part2)]
+fn solution2(input: &Input) -> usize {
+    input
+        .messages
+        .iter()
+        .filter(|msg| input.rules.is_match(msg))
+        .count()
+}
+
 #[cfg(test)]
 mod tests {
+    use pretty_assertions::assert_eq;
+
     use super::*;
-    const INPUT: &'static str = r#"0: 4 1 5
+    const INPUT1: &'static str = r#"0: 4 1 5
         1: 2 3 | 3 2
         2: 4 4 | 5 5
         3: 4 5 | 5 4
@@ -209,13 +342,13 @@ mod tests {
 
     #[test]
     fn part1() {
-        assert_eq!(solution1(&generator(INPUT)), 2);
+        assert_eq!(solution1(&generator_part1(INPUT1)), 2);
     }
 
     #[test]
-    fn parse() {
+    fn parse1() {
         assert_eq!(
-            generator(INPUT),
+            generator_part1(INPUT1),
             Input {
                 rules: Regex::new("^a((aa|bb)(ab|ba)|(ab|ba)(aa|bb))b$").unwrap(),
                 messages: vec!["ababbb", "bababa", "abbbab", "aaabbb", "aaaabbb",]
@@ -242,4 +375,82 @@ mod tests {
             Regex::new("^(aa|bb)$").unwrap().as_str()
         );
     }
+    const INPUT2: &'static str = r#"42: 9 14 | 10 1
+9: 14 27 | 1 26
+10: 23 14 | 28 1
+1: "a"
+11: 42 31
+5: 1 14 | 15 1
+19: 14 1 | 14 14
+12: 24 14 | 19 1
+16: 15 1 | 14 14
+31: 14 17 | 1 13
+6: 14 14 | 1 14
+2: 1 24 | 14 4
+0: 8 11
+13: 14 3 | 1 12
+15: 1 | 14
+17: 14 2 | 1 7
+23: 25 1 | 22 14
+28: 16 1
+4: 1 1
+20: 14 14 | 1 15
+3: 5 14 | 16 1
+27: 1 6 | 14 18
+14: "b"
+21: 14 1 | 1 14
+25: 1 1 | 1 14
+22: 14 14
+8: 42
+26: 14 22 | 1 20
+18: 15 15
+7: 14 5 | 1 21
+24: 14 1
+
+abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa
+bbabbbbaabaabba
+babbbbaabbbbbabbbbbbaabaaabaaa
+aaabbbbbbaaaabaababaabababbabaaabbababababaaa
+bbbbbbbaaaabbbbaaabbabaaa
+bbbababbbbaaaaaaaabbababaaababaabab
+ababaaaaaabaaab
+ababaaaaabbbaba
+baabbaaaabbaaaababbaababb
+abbbbabbbbaaaababbbbbbaaaababb
+aaaaabbaabaaaaababaa
+aaaabbaaaabbaaa
+aaaabbaabbaaaaaaabbbabbbaaabbaabaaa
+babaaabbbaaabaababbaabababaaab
+aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba"#;
+
+    #[test]
+    fn part2_matches() {
+        let input = generator_part2(INPUT2);
+        assert_eq!(
+            input
+                .messages
+                .iter()
+                .filter(|msg| input.rules.is_match(msg))
+                .collect::<Vec<_>>(),
+            vec![
+                "bbabbbbaabaabba",
+                "babbbbaabbbbbabbbbbbaabaaabaaa",
+                "aaabbbbbbaaaabaababaabababbabaaabbababababaaa",
+                "bbbbbbbaaaabbbbaaabbabaaa",
+                "bbbababbbbaaaaaaaabbababaaababaabab",
+                "ababaaaaaabaaab",
+                "ababaaaaabbbaba",
+                "baabbaaaabbaaaababbaababb",
+                "abbbbabbbbaaaababbbbbbaaaababb",
+                "aaaaabbaabaaaaababaa",
+                "aaaabbaabbaaaaaaabbbabbbaaabbaabaaa",
+                "aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba",
+            ]
+        );
+    }
+
+    #[test]
+    fn part2() {
+        assert_eq!(solution2(&generator_part2(INPUT2)), 12);
+    }
 }

2020/src/day20.rs

@@ -0,0 +1,987 @@
+//! --- Day 20: Jurassic Jigsaw ---
+//! The high-speed train leaves the forest and quickly carries you south. You can even see a desert in the distance! Since you have some spare time, you might as well see if there was anything interesting in the image the Mythical Information Bureau satellite captured.
+//!
+//! After decoding the satellite messages, you discover that the data actually contains many small images created by the satellite's camera array. The camera array consists of many cameras; rather than produce a single square image, they produce many smaller square image tiles that need to be reassembled back into a single image.
+//!
+//! Each camera in the camera array returns a single monochrome image tile with a random unique ID number. The tiles (your puzzle input) arrived in a random order.
+//!
+//! Worse yet, the camera array appears to be malfunctioning: each image tile has been rotated and flipped to a random orientation. Your first task is to reassemble the original image by orienting the tiles so they fit together.
+//!
+//! To show how the tiles should be reassembled, each tile's image data includes a border that should line up exactly with its adjacent tiles. All tiles have this border, and the border lines up exactly when the tiles are both oriented correctly. Tiles at the edge of the image also have this border, but the outermost edges won't line up with any other tiles.
+//!
+//! For example, suppose you have the following nine tiles:
+//!
+//! Tile 2311:
+//! ..##.#..#.
+//! ##..#.....
+//! #...##..#.
+//! ####.#...#
+//! ##.##.###.
+//! ##...#.###
+//! .#.#.#..##
+//! ..#....#..
+//! ###...#.#.
+//! ..###..###
+//!
+//! Tile 1951:
+//! #.##...##.
+//! #.####...#
+//! .....#..##
+//! #...######
+//! .##.#....#
+//! .###.#####
+//! ###.##.##.
+//! .###....#.
+//! ..#.#..#.#
+//! #...##.#..
+//!
+//! Tile 1171:
+//! ####...##.
+//! #..##.#..#
+//! ##.#..#.#.
+//! .###.####.
+//! ..###.####
+//! .##....##.
+//! .#...####.
+//! #.##.####.
+//! ####..#...
+//! .....##...
+//!
+//! Tile 1427:
+//! ###.##.#..
+//! .#..#.##..
+//! .#.##.#..#
+//! #.#.#.##.#
+//! ....#...##
+//! ...##..##.
+//! ...#.#####
+//! .#.####.#.
+//! ..#..###.#
+//! ..##.#..#.
+//!
+//! Tile 1489:
+//! ##.#.#....
+//! ..##...#..
+//! .##..##...
+//! ..#...#...
+//! #####...#.
+//! #..#.#.#.#
+//! ...#.#.#..
+//! ##.#...##.
+//! ..##.##.##
+//! ###.##.#..
+//!
+//! Tile 2473:
+//! #....####.
+//! #..#.##...
+//! #.##..#...
+//! ######.#.#
+//! .#...#.#.#
+//! .#########
+//! .###.#..#.
+//! ########.#
+//! ##...##.#.
+//! ..###.#.#.
+//!
+//! Tile 2971:
+//! ..#.#....#
+//! #...###...
+//! #.#.###...
+//! ##.##..#..
+//! .#####..##
+//! .#..####.#
+//! #..#.#..#.
+//! ..####.###
+//! ..#.#.###.
+//! ...#.#.#.#
+//!
+//! Tile 2729:
+//! ...#.#.#.#
+//! ####.#....
+//! ..#.#.....
+//! ....#..#.#
+//! .##..##.#.
+//! .#.####...
+//! ####.#.#..
+//! ##.####...
+//! ##..#.##..
+//! #.##...##.
+//!
+//! Tile 3079:
+//! #.#.#####.
+//! .#..######
+//! ..#.......
+//! ######....
+//! ####.#..#.
+//! .#...#.##.
+//! #.#####.##
+//! ..#.###...
+//! ..#.......
+//! ..#.###...
+//! By rotating, flipping, and rearranging them, you can find a square arrangement that causes all adjacent borders to line up:
+//!
+//! #...##.#.. ..###..### #.#.#####.
+//! ..#.#..#.# ###...#.#. .#..######
+//! .###....#. ..#....#.. ..#.......
+//! ###.##.##. .#.#.#..## ######....
+//! .###.##### ##...#.### ####.#..#.
+//! .##.#....# ##.##.###. .#...#.##.
+//! #...###### ####.#...# #.#####.##
+//! .....#..## #...##..#. ..#.###...
+//! #.####...# ##..#..... ..#.......
+//! #.##...##. ..##.#..#. ..#.###...
+//!
+//! #.##...##. ..##.#..#. ..#.###...
+//! ##..#.##.. ..#..###.# ##.##....#
+//! ##.####... .#.####.#. ..#.###..#
+//! ####.#.#.. ...#.##### ###.#..###
+//! .#.####... ...##..##. .######.##
+//! .##..##.#. ....#...## #.#.#.#...
+//! ....#..#.# #.#.#.##.# #.###.###.
+//! ..#.#..... .#.##.#..# #.###.##..
+//! ####.#.... .#..#.##.. .######...
+//! ...#.#.#.# ###.##.#.. .##...####
+//!
+//! ...#.#.#.# ###.##.#.. .##...####
+//! ..#.#.###. ..##.##.## #..#.##..#
+//! ..####.### ##.#...##. .#.#..#.##
+//! #..#.#..#. ...#.#.#.. .####.###.
+//! .#..####.# #..#.#.#.# ####.###..
+//! .#####..## #####...#. .##....##.
+//! ##.##..#.. ..#...#... .####...#.
+//! #.#.###... .##..##... .####.##.#
+//! #...###... ..##...#.. ...#..####
+//! ..#.#....# ##.#.#.... ...##.....
+//! For reference, the IDs of the above tiles are:
+//!
+//! 1951    2311    3079
+//! 2729    1427    2473
+//! 2971    1489    1171
+//! To check that you've assembled the image correctly, multiply the IDs of the four corner tiles together. If you do this with the assembled tiles from the example above, you get 1951 * 3079 * 2971 * 1171 = 20899048083289.
+//!
+//! Assemble the tiles into an image. What do you get if you multiply together the IDs of the four corner tiles?
+//!
+//! --- Part Two ---
+//! Now, you're ready to check the image for sea monsters.
+//!
+//! The borders of each tile are not part of the actual image; start by removing them.
+//!
+//! In the example above, the tiles become:
+//!
+//! .#.#..#. ##...#.# #..#####
+//! ###....# .#....#. .#......
+//! ##.##.## #.#.#..# #####...
+//! ###.#### #...#.## ###.#..#
+//! ##.#.... #.##.### #...#.##
+//! ...##### ###.#... .#####.#
+//! ....#..# ...##..# .#.###..
+//! .####... #..#.... .#......
+//!
+//! #..#.##. .#..###. #.##....
+//! #.####.. #.####.# .#.###..
+//! ###.#.#. ..#.#### ##.#..##
+//! #.####.. ..##..## ######.#
+//! ##..##.# ...#...# .#.#.#..
+//! ...#..#. .#.#.##. .###.###
+//! .#.#.... #.##.#.. .###.##.
+//! ###.#... #..#.##. ######..
+//!
+//! .#.#.### .##.##.# ..#.##..
+//! .####.## #.#...## #.#..#.#
+//! ..#.#..# ..#.#.#. ####.###
+//! #..####. ..#.#.#. ###.###.
+//! #####..# ####...# ##....##
+//! #.##..#. .#...#.. ####...#
+//! .#.###.. ##..##.. ####.##.
+//! ...###.. .##...#. ..#..###
+//! Remove the gaps to form the actual image:
+//!
+//! .#.#..#.##...#.##..#####
+//! ###....#.#....#..#......
+//! ##.##.###.#.#..######...
+//! ###.#####...#.#####.#..#
+//! ##.#....#.##.####...#.##
+//! ...########.#....#####.#
+//! ....#..#...##..#.#.###..
+//! .####...#..#.....#......
+//! #..#.##..#..###.#.##....
+//! #.####..#.####.#.#.###..
+//! ###.#.#...#.######.#..##
+//! #.####....##..########.#
+//! ##..##.#...#...#.#.#.#..
+//! ...#..#..#.#.##..###.###
+//! .#.#....#.##.#...###.##.
+//! ###.#...#..#.##.######..
+//! .#.#.###.##.##.#..#.##..
+//! .####.###.#...###.#..#.#
+//! ..#.#..#..#.#.#.####.###
+//! #..####...#.#.#.###.###.
+//! #####..#####...###....##
+//! #.##..#..#...#..####...#
+//! .#.###..##..##..####.##.
+//! ...###...##...#...#..###
+//! Now, you're ready to search for sea monsters! Because your image is monochrome, a sea monster will look like this:
+//!
+//!                   #
+//! #    ##    ##    ###
+//!  #  #  #  #  #  #
+//! When looking for this pattern in the image, the spaces can be anything; only the # need to match. Also, you might need to rotate or flip your image before it's oriented correctly to find sea monsters. In the above image, after flipping and rotating it to the appropriate orientation, there are two sea monsters (marked with O):
+//!
+//! .####...#####..#...###..
+//! #####..#..#.#.####..#.#.
+//! .#.#...#.###...#.##.O#..
+//! #.O.##.OO#.#.OO.##.OOO##
+//! ..#O.#O#.O##O..O.#O##.##
+//! ...#.#..##.##...#..#..##
+//! #.##.#..#.#..#..##.#.#..
+//! .###.##.....#...###.#...
+//! #.####.#.#....##.#..#.#.
+//! ##...#..#....#..#...####
+//! ..#.##...###..#.#####..#
+//! ....#.##.#.#####....#...
+//! ..##.##.###.....#.##..#.
+//! #...#...###..####....##.
+//! .#.##...#.##.#.#.###...#
+//! #.###.#..####...##..#...
+//! #.###...#.##...#.##O###.
+//! .O##.#OO.###OO##..OOO##.
+//! ..O#.O..O..O.#O##O##.###
+//! #.#..##.########..#..##.
+//! #.#####..#.#...##..#....
+//! #....##..#.#########..##
+//! #...#.....#..##...###.##
+//! #..###....##.#...##.##.#
+//! Determine how rough the waters are in the sea monsters' habitat by counting the number of # that are not part of a sea monster. In the above example, the habitat's water roughness is 273.
+//!
+//! How many # are not part of a sea monster?
+
+use std::collections::{HashMap, HashSet};
+use std::fmt;
+use std::ops::{Index, IndexMut};
+use std::str::FromStr;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+use crate::debug_println;
+
+#[derive(Clone, Default, Hash, Eq, PartialEq)]
+struct Tile {
+    id: usize,
+    pixels: Vec<u8>,
+    width: usize,
+    height: usize,
+}
+
+impl fmt::Debug for Tile {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Tile {} ({}x{}):\n", self.id, self.width, self.height)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                write!(f, "{}", self[(x, y)] as char)?;
+            }
+            write!(f, "\n")?;
+        }
+        write!(f, "\n")
+    }
+}
+
+impl FromStr for Tile {
+    type Err = ();
+    fn from_str(s: &str) -> Result<Tile, ()> {
+        let mut it = s.split('\n');
+        let id = it
+            .next()
+            .expect("couldn't get first line of tile")
+            .trim()
+            .split(' ')
+            .skip(1)
+            .next()
+            .expect("couldn't get second word of tile header")
+            .strip_suffix(':')
+            .expect("couldn't strip ':' from tile header")
+            .parse()
+            .expect("couldn't parse tile number");
+        let rows: Vec<_> = it.map(|l| l.trim()).collect();
+        let height = rows.len();
+        let mut width = 0;
+        let mut pixels = Vec::with_capacity(height * height);
+        rows.iter().for_each(|row| {
+            width = row.len();
+            pixels.extend(row.bytes());
+        });
+        Ok(Tile {
+            id,
+            pixels,
+            height,
+            width,
+        })
+    }
+}
+
+impl IndexMut<(usize, usize)> for Tile {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        &mut self.pixels[x + y * self.width]
+    }
+}
+
+impl Index<(usize, usize)> for Tile {
+    type Output = u8;
+
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+#[cfg(any(debug_assertions, test))]
+fn border_to_str(border: &[u8]) -> String {
+    std::str::from_utf8(border).unwrap().to_string()
+}
+
+impl Tile {
+    /// Copy `t` into self @ x_off,y_off.
+    fn blit(&mut self, t: &Tile, x_off: usize, y_off: usize) {
+        debug_println!(
+            "blitting tile {} {}x{} @ {},{}",
+            t.id,
+            t.width,
+            t.height,
+            x_off,
+            y_off
+        );
+        (0..t.height)
+            .for_each(|y| (0..t.width).for_each(|x| self[(x_off + x, y_off + y)] = t[(x, y)]));
+    }
+    /// Builds a set containing all the borders of this tile and their reverse (useful if the tile
+    /// is in the wrong orientation).
+    fn border_set(&self) -> HashSet<Vec<u8>> {
+        let mut set = HashSet::new();
+        set.insert(self.top_border());
+        set.insert(self.right_border());
+        set.insert(self.bottom_border());
+        set.insert(self.left_border());
+
+        let rev_set: HashSet<_> = set
+            .iter()
+            .map(|b| {
+                let mut b = b.clone();
+                b.reverse();
+                b
+            })
+            .collect();
+        set.union(&rev_set).cloned().collect()
+    }
+    fn top_border(&self) -> Vec<u8> {
+        (0..self.width).map(|x| self[(x, 0)]).collect()
+    }
+    fn right_border(&self) -> Vec<u8> {
+        (0..self.height)
+            .map(|y| self[(self.width - 1, y)])
+            .collect()
+    }
+    fn bottom_border(&self) -> Vec<u8> {
+        (0..self.width)
+            .map(|x| self[(x, self.height - 1)])
+            .collect()
+    }
+    fn left_border(&self) -> Vec<u8> {
+        (0..self.height).map(|y| self[(0, y)]).collect()
+    }
+    fn strip_border(&self) -> Tile {
+        let pixels = (1..self.height - 1)
+            .map(|y| (1..self.width - 1).map(move |x| self[(x, y)]))
+            .flatten()
+            .collect();
+
+        Tile {
+            id: self.id,
+            width: self.width - 2,
+            height: self.height - 2,
+            pixels,
+        }
+    }
+    fn search(&self, needle: &Tile, x_off: usize, y_off: usize) -> bool {
+        for n_y in 0..needle.height {
+            for n_x in 0..needle.width {
+                if needle[(n_x, n_y)] != b'#' {
+                    continue;
+                }
+                if self[(x_off + n_x, y_off + n_y)] != b'#' {
+                    return false;
+                }
+            }
+        }
+        true
+    }
+    fn count_hashes(&self) -> usize {
+        self.pixels.iter().filter(|b| *b == &b'#').count()
+    }
+    fn rotate90(&self) -> Tile {
+        let pixels = (0..self.height)
+            .map(|y| (0..self.width).map(move |x| self[(y, self.height - x - 1)]))
+            .flatten()
+            .collect();
+
+        Tile {
+            id: self.id,
+            width: self.width,
+            height: self.height,
+            pixels,
+        }
+    }
+    /// Slow but easy to implement.
+    fn rotate180(&self) -> Tile {
+        self.rotate90().rotate90()
+    }
+    /// Slow but easy to implement.
+    fn rotate270(&self) -> Tile {
+        self.rotate180().rotate90()
+    }
+    fn flip_horizontal(&self) -> Tile {
+        let pixels = (0..self.height)
+            .map(|y| (0..self.width).map(move |x| self[(self.width - x - 1, y)]))
+            .flatten()
+            .collect();
+
+        Tile {
+            id: self.id,
+            width: self.width,
+            height: self.height,
+            pixels,
+        }
+    }
+
+    /// Finds number of occurrences of needle in self.  A match requires all '#' in needle to be
+    /// found in self.  Extra '#' in self are ignored. The returned vector is the x,y of the upper
+    /// left pixel for the match.
+    fn find_hashes(&self, needle: &Tile) -> Vec<(usize, usize)> {
+        let mut res = Vec::new();
+        for y_off in 0..self.height - needle.height {
+            for x_off in 0..self.width - needle.width {
+                if self.search(needle, x_off, y_off) {
+                    res.push((x_off, y_off));
+                }
+            }
+        }
+        res
+    }
+}
+
+/// Tries various orientations, until predicate matches.
+fn reorient<F>(img: &Tile, predicate: F) -> Option<Tile>
+where
+    F: Fn(&Tile) -> bool,
+{
+    if predicate(&img) {
+        return Some(img.clone());
+    }
+    let rotated = img.rotate90();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+
+    let rotated = img.rotate180();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+
+    let rotated = img.rotate270();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+
+    let horiz = img.flip_horizontal();
+    if predicate(&horiz) {
+        return Some(horiz);
+    }
+
+    let rotated = horiz.rotate90();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+
+    let rotated = horiz.rotate180();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+
+    let rotated = horiz.rotate270();
+    if predicate(&rotated) {
+        return Some(rotated);
+    }
+    None
+}
+
+fn stitch(tiles: &[Tile]) -> Tile {
+    // Make sure there's a square number of tiles.
+    let sqrt = (tiles.len() as f32).sqrt() as usize;
+    assert_eq!(sqrt * sqrt, tiles.len());
+
+    let width = sqrt * (tiles[0].width - 2);
+    let height = sqrt * (tiles[0].height - 2);
+    let mut image = Tile {
+        id: 0,
+        width,
+        height,
+        pixels: vec![b'X'; width * height],
+    };
+
+    let mut border_counts = HashMap::new();
+    let mut border_map = HashMap::new();
+    tiles.iter().for_each(|t| {
+        t.border_set().iter().for_each(|b| {
+            border_map.insert(b.clone(), t.id);
+            let c = border_counts.entry(b.clone()).or_insert(0);
+            *c += 1;
+        })
+    });
+
+    #[cfg(any(debug_assertions, test))]
+    border_counts.iter().for_each(|(b, c)| {
+        let _ = b;
+        let _ = c;
+        debug_println!("{}: {}", border_to_str(b), c);
+    });
+
+    let edge_borders: HashSet<_> = border_counts
+        .iter()
+        .filter(|(_b, c)| **c == 1)
+        .map(|(b, _c)| b)
+        .collect();
+    // Count the number of borders that are in edge_borders.  The answer should be 0, 1 or 2
+    // if the tile is a middle, edge or corner, respectively.
+    let (corner_tiles, _edge_tiles, _center_tiles) = tiles.iter().fold(
+        (vec![], vec![], vec![]),
+        |(mut corner, mut edge, mut center), t| {
+            let edge_count = vec![
+                t.top_border(),
+                t.right_border(),
+                t.bottom_border(),
+                t.left_border(),
+            ]
+            .into_iter()
+            .filter(|b| edge_borders.contains(b))
+            .count();
+            match edge_count {
+                0 => center.push(t),
+                1 => edge.push(t),
+                2 => corner.push(t),
+                c => panic!(format!("unexpected edge_count for {:?}: {}", t, c)),
+            };
+            (corner, edge, center)
+        },
+    );
+
+    let mut tile_map = vec![vec![None; sqrt]; sqrt];
+    let corner = corner_tiles[0];
+    // Make this the upper-left corner at 0,0.
+    let corner = reorient(corner, |im| {
+        edge_borders.contains(&im.left_border()) && edge_borders.contains(&im.top_border())
+    })
+    .expect("couldn't find proper orientation");
+    let mut remaining_tiles: HashSet<_> = tiles.iter().filter(|t| t.id != corner.id).collect();
+    let mut last = corner.clone();
+    tile_map[0][0] = Some(corner);
+    (0..sqrt)
+        .map(|y| (0..sqrt).map(move |x| (x, y)))
+        .flatten()
+        .skip(1)
+        .for_each(|(x, y)| {
+            debug_println!("Solving for tile {},{}", x, y);
+            let mut local_last = last.clone();
+            let orientation_check: Box<dyn Fn(&Tile) -> bool> = if y == 0 {
+                debug_println!("search for top row tiles");
+                // Top row, tiles should be match the tile to the left and have their top_border in the
+                // edge set.
+                // Find a tile that matches last and reorient so it's edge is on top.
+                Box::new(|im: &Tile| {
+                    edge_borders.contains(&im.top_border())
+                        && im.left_border() == local_last.right_border()
+                })
+            } else if x == 0 {
+                debug_println!("search for left column tiles");
+                // When we're in the first column, we need to match against the tile above, instead of
+                // the last tile on the previous row.
+                local_last = tile_map[0][y - 1]
+                    .as_ref()
+                    .expect(&format!("couldn't file tile above {},{}", x, y))
+                    .clone();
+                Box::new(|im: &Tile| {
+                    edge_borders.contains(&im.left_border())
+                        && im.top_border() == local_last.bottom_border()
+                })
+            } else {
+                debug_println!("search for regular tiles");
+                // Default, last is to the left match shared edge.
+                Box::new(|im: &Tile| im.left_border() == local_last.right_border())
+            };
+
+            debug_println!("last tile {}", last.id);
+            let mut found: Option<Tile> = None;
+            for candidate in &remaining_tiles {
+                match reorient(candidate, &orientation_check) {
+                    Some(good) => {
+                        debug_println!("found3 {}", good.id);
+                        found = Some(good);
+                        break;
+                    }
+                    None => continue,
+                };
+            }
+            match found {
+                Some(rm) => {
+                    debug_println!(
+                        "rm3 {} {:?}",
+                        rm.id,
+                        remaining_tiles.iter().map(|t| t.id).collect::<Vec<_>>()
+                    );
+                    last = rm.clone();
+                    tile_map[x][y] = Some(last.clone());
+                    let rm = remaining_tiles
+                        .iter()
+                        .filter(|t| t.id == rm.id)
+                        .nth(0)
+                        .expect(&format!("Couldn't find {} in remaining_tiles", rm.id))
+                        .clone();
+                    remaining_tiles.remove(rm);
+                }
+                None => panic!("couldn't find match for {},{}", x, y),
+            };
+        });
+    debug_println!("Stitched titles");
+    #[cfg(debug_assertions)]
+    (0..sqrt).for_each(|y| {
+        let row_ids: Vec<_> = (0..sqrt)
+            .map(|x| tile_map[x][y].as_ref().unwrap().id)
+            .collect();
+        debug_println!("{:?}", row_ids);
+    });
+    (0..sqrt)
+        .map(|y| (0..sqrt).map(move |x| (x, y)))
+        .flatten()
+        .for_each(|(x, y)| {
+            let t = tile_map[x][y]
+                .as_ref()
+                .expect(&format!("missing tile {},{} in completed tile_map", x, y));
+            let out = t.strip_border();
+            image.blit(&out, x * out.width, y * out.height);
+        });
+
+    // TODO(wathiede) paste oriented into image.
+    image
+}
+
+#[aoc_generator(day20)]
+fn generator(input: &str) -> Vec<Tile> {
+    input
+        .split("\n\n")
+        .map(|s| s.parse().expect("failed to parse tile"))
+        .collect()
+}
+
+fn seamonster() -> Tile {
+    const MONSTER: &'static str = r#"Tile 666:
+        ..................#.
+#....##....##....###
+        .#..#..#..#..#..#..."#;
+
+    MONSTER.parse().expect("failed to parse seamonster")
+}
+
+#[aoc(day20, part1)]
+fn solution1(tiles: &[Tile]) -> usize {
+    let mut border_counts = HashMap::new();
+    tiles.iter().for_each(|t| {
+        t.border_set().iter().for_each(|b| {
+            let c = border_counts.entry(b.clone()).or_insert(0);
+            *c += 1;
+        })
+    });
+
+    let corner_tiles: Vec<_> = tiles
+        .iter()
+        .filter(|t| {
+            let matches: usize = t.border_set().iter().map(|b| border_counts[b]).sum();
+            matches == 12
+        })
+        .collect();
+    corner_tiles.iter().map(|t| t.id).product()
+}
+
+fn habitat(img: &Tile) -> usize {
+    let monster = seamonster();
+    let num_monsters = img.find_hashes(&monster).len();
+    img.count_hashes() - (num_monsters * monster.count_hashes())
+}
+
+fn contains_seamonster(t: &Tile) -> bool {
+    let monster = seamonster();
+    t.find_hashes(&monster).len() > 0
+}
+
+#[aoc(day20, part2)]
+fn solution2(tiles: &[Tile]) -> usize {
+    let full_map = stitch(tiles);
+    debug_println!("Full map\n{:?}", full_map);
+    habitat(&reorient(&full_map, contains_seamonster).expect("couldn't find proper orientation"))
+}
+
+#[cfg(test)]
+mod tests {
+    //use pretty_assertions::assert_eq;
+
+    use super::*;
+    const INPUT: &'static str = r#"Tile 2311:
+        ..##.#..#.
+##..#.....
+#...##..#.
+####.#...#
+##.##.###.
+##...#.###
+        .#.#.#..##
+        ..#....#..
+###...#.#.
+        ..###..###
+
+        Tile 1951:
+#.##...##.
+#.####...#
+        .....#..##
+#...######
+        .##.#....#
+        .###.#####
+###.##.##.
+        .###....#.
+        ..#.#..#.#
+#...##.#..
+
+        Tile 1171:
+####...##.
+#..##.#..#
+##.#..#.#.
+        .###.####.
+        ..###.####
+        .##....##.
+        .#...####.
+#.##.####.
+####..#...
+        .....##...
+
+        Tile 1427:
+###.##.#..
+        .#..#.##..
+        .#.##.#..#
+#.#.#.##.#
+        ....#...##
+        ...##..##.
+        ...#.#####
+        .#.####.#.
+        ..#..###.#
+        ..##.#..#.
+
+        Tile 1489:
+##.#.#....
+        ..##...#..
+        .##..##...
+        ..#...#...
+#####...#.
+#..#.#.#.#
+        ...#.#.#..
+##.#...##.
+        ..##.##.##
+###.##.#..
+
+        Tile 2473:
+#....####.
+#..#.##...
+#.##..#...
+######.#.#
+        .#...#.#.#
+        .#########
+        .###.#..#.
+########.#
+##...##.#.
+        ..###.#.#.
+
+        Tile 2971:
+        ..#.#....#
+#...###...
+#.#.###...
+##.##..#..
+        .#####..##
+        .#..####.#
+#..#.#..#.
+        ..####.###
+        ..#.#.###.
+        ...#.#.#.#
+
+        Tile 2729:
+        ...#.#.#.#
+####.#....
+        ..#.#.....
+        ....#..#.#
+        .##..##.#.
+        .#.####...
+####.#.#..
+##.####...
+##..#.##..
+#.##...##.
+
+        Tile 3079:
+#.#.#####.
+        .#..######
+        ..#.......
+######....
+####.#..#.
+        .#...#.##.
+#.#####.##
+        ..#.###...
+        ..#.......
+        ..#.###..."#;
+
+    #[test]
+    fn test_generator() {
+        assert_eq!(
+            generator(&INPUT).iter().map(|t| t.id).collect::<Vec<_>>(),
+            vec![2311, 1951, 1171, 1427, 1489, 2473, 2971, 2729, 3079,]
+        );
+    }
+
+    #[test]
+    fn test_solution1() {
+        assert_eq!(solution1(&generator(&INPUT)), 1951 * 3079 * 2971 * 1171);
+    }
+
+    const OUTPUT_IMAGE: &'static str = r#"Tile 0:
+.#.#..#.##...#.##..#####
+###....#.#....#..#......
+##.##.###.#.#..######...
+###.#####...#.#####.#..#
+##.#....#.##.####...#.##
+...########.#....#####.#
+....#..#...##..#.#.###..
+.####...#..#.....#......
+#..#.##..#..###.#.##....
+#.####..#.####.#.#.###..
+###.#.#...#.######.#..##
+#.####....##..########.#
+##..##.#...#...#.#.#.#..
+...#..#..#.#.##..###.###
+.#.#....#.##.#...###.##.
+###.#...#..#.##.######..
+.#.#.###.##.##.#..#.##..
+.####.###.#...###.#..#.#
+..#.#..#..#.#.#.####.###
+#..####...#.#.#.###.###.
+#####..#####...###....##
+#.##..#..#...#..####...#
+.#.###..##..##..####.##.
+...###...##...#...#..###"#;
+
+    #[test]
+    fn make_image() {
+        let _: Tile = OUTPUT_IMAGE.parse().expect("failed to part want image");
+    }
+    #[test]
+    fn find_monster() {
+        let img: Tile = OUTPUT_IMAGE.parse().expect("failed to part want image");
+        let monster = seamonster();
+        dbg!(&img);
+        dbg!(&monster);
+        assert_eq!(img.find_hashes(&monster).len(), 0);
+        assert_eq!(img.rotate90().find_hashes(&monster).len(), 0);
+        assert_eq!(img.rotate180().find_hashes(&monster).len(), 0);
+        assert_eq!(img.rotate270().find_hashes(&monster).len(), 0);
+
+        let horiz = img.flip_horizontal();
+        assert_eq!(horiz.rotate90().find_hashes(&monster).len(), 0);
+        assert_eq!(horiz.rotate180().find_hashes(&monster).len(), 0);
+        assert_eq!(horiz.rotate270().find_hashes(&monster).len(), 2);
+
+        let correct = horiz.rotate270();
+        dbg!(&correct);
+        assert_eq!(correct.find_hashes(&monster), vec![(2, 2), (1, 16),]);
+    }
+
+    #[test]
+    fn test_reorient() {
+        let img: Tile = OUTPUT_IMAGE.parse().expect("failed to part want image");
+        let monster = seamonster();
+        assert_eq!(
+            reorient(&img, contains_seamonster)
+                .expect("couldn't find proper orientation")
+                .find_hashes(&monster)
+                .len(),
+            2
+        );
+    }
+
+    const TEST_ROTATE: &'static str = "Tile 0:\n#.\n..";
+    #[test]
+    fn rotate90() {
+        let img: Tile = TEST_ROTATE.parse().expect("failed to part rotate image");
+        let want: Tile = "Tile 0:\n.#\n.."
+            .parse()
+            .expect("failed to parse rotate90 want");
+        assert_eq!(img.rotate90(), want);
+    }
+    #[test]
+    fn rotate180() {
+        let img: Tile = TEST_ROTATE.parse().expect("failed to part rotate image");
+        let want: Tile = "Tile 0:\n..\n.#"
+            .parse()
+            .expect("failed to parse rotate180 want");
+        assert_eq!(img.rotate180(), want);
+    }
+    #[test]
+    fn rotate270() {
+        let img: Tile = TEST_ROTATE.parse().expect("failed to part rotate image");
+        let want: Tile = "Tile 0:\n..\n#."
+            .parse()
+            .expect("failed to parse rotate270 want");
+        assert_eq!(img.rotate270(), want);
+    }
+    #[test]
+    fn flip_horizontal() {
+        let img: Tile = TEST_ROTATE.parse().expect("failed to part rotate image");
+        let want: Tile = "Tile 0:\n.#\n.."
+            .parse()
+            .expect("failed to parse flip_horizontal want");
+        assert_eq!(img.flip_horizontal(), want);
+    }
+    #[test]
+    fn test_habitat() {
+        let img: Tile = OUTPUT_IMAGE.parse().expect("failed to part want image");
+        dbg!(img.count_hashes());
+        dbg!(seamonster().count_hashes());
+        assert_eq!(
+            habitat(
+                &reorient(&img, contains_seamonster).expect("couldn't find proper orientation")
+            ),
+            273
+        );
+    }
+    #[test]
+    fn test_stitch() {
+        let want: Tile = OUTPUT_IMAGE.parse().expect("can't parse stitched input");
+        let output = stitch(&generator(INPUT));
+        let output = reorient(&output, contains_seamonster);
+
+        match output {
+            None => assert!(false, "Failed to reorient stitched image to reference"),
+            Some(im) => {
+                dbg!(&im);
+                assert_eq!(
+                    habitat(&im),
+                    273,
+                    "\n  im {}\nwant {}",
+                    border_to_str(&im.pixels),
+                    border_to_str(&want.pixels)
+                );
+            }
+        }
+    }
+    #[test]
+    fn test_solution2() {
+        assert_eq!(solution2(&generator(&INPUT)), 273);
+    }
+}

2020/src/day21.rs

@@ -0,0 +1,246 @@
+//! --- Day 21: Allergen Assessment ---
+//! You reach the train's last stop and the closest you can get to your vacation island without getting wet. There aren't even any boats here, but nothing can stop you now: you build a raft. You just need a few days' worth of food for your journey.
+//!
+//! You don't speak the local language, so you can't read any ingredients lists. However, sometimes, allergens are listed in a language you do understand. You should be able to use this information to determine which ingredient contains which allergen and work out which foods are safe to take with you on your trip.
+//!
+//! You start by compiling a list of foods (your puzzle input), one food per line. Each line includes that food's ingredients list followed by some or all of the allergens the food contains.
+//!
+//! Each allergen is found in exactly one ingredient. Each ingredient contains zero or one allergen. Allergens aren't always marked; when they're listed (as in (contains nuts, shellfish) after an ingredients list), the ingredient that contains each listed allergen will be somewhere in the corresponding ingredients list. However, even if an allergen isn't listed, the ingredient that contains that allergen could still be present: maybe they forgot to label it, or maybe it was labeled in a language you don't know.
+//!
+//! For example, consider the following list of foods:
+//!
+//! mxmxvkd kfcds sqjhc nhms (contains dairy, fish)
+//! trh fvjkl sbzzf mxmxvkd (contains dairy)
+//! sqjhc fvjkl (contains soy)
+//! sqjhc mxmxvkd sbzzf (contains fish)
+//! The first food in the list has four ingredients (written in a language you don't understand): mxmxvkd, kfcds, sqjhc, and nhms. While the food might contain other allergens, a few allergens the food definitely contains are listed afterward: dairy and fish.
+//!
+//! The first step is to determine which ingredients can't possibly contain any of the allergens in any food in your list. In the above example, none of the ingredients kfcds, nhms, sbzzf, or trh can contain an allergen. Counting the number of times any of these ingredients appear in any ingredients list produces 5: they all appear once each except sbzzf, which appears twice.
+//!
+//! Determine which ingredients cannot possibly contain any of the allergens in your list. How many times do any of those ingredients appear?
+//!
+//! --- Part Two ---
+//! Now that you've isolated the inert ingredients, you should have enough information to figure out which ingredient contains which allergen.
+//!
+//! In the above example:
+//!
+//! mxmxvkd contains dairy.
+//! sqjhc contains fish.
+//! fvjkl contains soy.
+//! Arrange the ingredients alphabetically by their allergen and separate them by commas to produce your canonical dangerous ingredient list. (There should not be any spaces in your canonical dangerous ingredient list.) In the above example, this would be mxmxvkd,sqjhc,fvjkl.
+//!
+//! Time to stock your raft with supplies. What is your canonical dangerous ingredient list?
+
+use std::collections::{HashMap, HashSet};
+use std::str::FromStr;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+use crate::{debug_print, debug_println};
+
+struct Food {
+    ingredients: Vec<String>,
+    allergens: Vec<String>,
+}
+
+impl FromStr for Food {
+    type Err = ();
+    fn from_str(s: &str) -> Result<Food, ()> {
+        let ingredients = s
+            .split(' ')
+            .take_while(|s| !s.starts_with('('))
+            .map(|s| s.to_string())
+            .collect();
+        let allergens = s
+            .split(' ')
+            .skip_while(|s| !s.starts_with('('))
+            .skip(1)
+            .map(|s| s.trim_matches(&[',', ')'][..]).to_string())
+            .collect();
+        Ok(Food {
+            ingredients,
+            allergens,
+        })
+    }
+}
+
+impl Food {}
+fn count_ingredients(foods: &[Food], ingredients: &HashSet<String>) -> usize {
+    foods
+        .iter()
+        .map(|food| {
+            food.ingredients
+                .iter()
+                .filter(|i| ingredients.contains(*i))
+                .count()
+        })
+        .sum()
+}
+
+#[aoc_generator(day21)]
+fn generator(input: &str) -> Vec<Food> {
+    input
+        .split('\n')
+        .map(|s| s.parse().expect("couldn't parse food"))
+        .collect()
+}
+
+fn find_non_allergens(foods: &[Food]) -> HashSet<String> {
+    // Find ingredients common across all foods for a given allergen.  The remaining ingredients
+    // are non-allergens.
+    //
+    let mut allergen_map = HashMap::new();
+    let mut ingredient_map = HashMap::new();
+    foods.iter().for_each(|f| {
+        f.allergens.iter().for_each(|allergen| {
+            let a = allergen_map.entry(allergen).or_insert(0);
+            *a += 1;
+            f.ingredients.iter().for_each(|ingredient| {
+                let i = ingredient_map
+                    .entry(ingredient)
+                    .or_insert(HashMap::new())
+                    .entry(allergen)
+                    .or_insert(0);
+                *i += 1;
+            });
+        });
+    });
+
+    ingredient_map
+        .iter()
+        .filter(|(_, v)| !v.iter().any(|(a, c)| &allergen_map[a] == c))
+        .map(|(k, _)| k.to_string())
+        .collect()
+}
+
+#[aoc(day21, part1)]
+fn solution1(foods: &[Food]) -> usize {
+    let ingredients = find_non_allergens(foods);
+    count_ingredients(&foods, &ingredients)
+}
+
+fn allergen_ingredients(foods: &[Food], non_allergens: &HashSet<String>) -> Vec<(String, String)> {
+    let mut allergen_only = HashMap::new();
+    foods.iter().for_each(|food| {
+        debug_print!("{:?}:", food.allergens);
+        food.ingredients.iter().for_each(|i| {
+            for a in &food.allergens {
+                let v = allergen_only
+                    .entry(a)
+                    .or_insert(HashMap::new())
+                    .entry(i)
+                    .or_insert(0);
+                *v += 1;
+            }
+            if !non_allergens.contains(i) {
+                debug_print!(" {}", i);
+            }
+        });
+        food.ingredients.iter().for_each(|i| {
+            if non_allergens.contains(i) {
+                debug_print!(" *{}", i);
+            }
+        });
+        debug_println!();
+    });
+    let mut answer = HashMap::new();
+    let mut limit = 0;
+    loop {
+        if allergen_only.is_empty() {
+            return answer.into_iter().collect();
+        };
+        let mut rm = ("".to_string(), "".to_string());
+        allergen_only.iter().for_each(|(a, i_counts)| {
+            let max = i_counts.values().max().unwrap();
+            if i_counts.iter().filter(|(_i, c)| c == &max).count() == 1 {
+                let i = i_counts
+                    .iter()
+                    .filter(|(_i, c)| c == &max)
+                    .map(|(i, _c)| i)
+                    .nth(0)
+                    .unwrap();
+                answer.insert(a.to_string(), i.to_string());
+                rm = (a.to_string(), i.to_string());
+            }
+        });
+        debug_println!("removing {:?}", rm);
+        allergen_only.iter_mut().for_each(|(_, i_counts)| {
+            i_counts.remove(&rm.1);
+        });
+        allergen_only.remove(&rm.0);
+        limit += 1;
+        if limit > 10 {
+            panic!()
+        };
+    }
+}
+
+#[aoc(day21, part2)]
+fn solution2(foods: &[Food]) -> String {
+    let non_allergens = find_non_allergens(foods);
+    let mut allergens = allergen_ingredients(foods, &non_allergens);
+    allergens.sort_by(|l, r| l.0.cmp(&r.0));
+    allergens
+        .iter()
+        .map(|(_, a)| a.as_str())
+        .collect::<Vec<_>>()
+        .as_slice()
+        .join(",")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const INPUT: &'static str = r#"mxmxvkd kfcds sqjhc nhms (contains dairy, fish)
+trh fvjkl sbzzf mxmxvkd (contains dairy)
+sqjhc fvjkl (contains soy)
+sqjhc mxmxvkd sbzzf (contains fish)"#;
+
+    #[test]
+    fn parse() {
+        let foods = generator(INPUT);
+        assert_eq!(foods.len(), 4);
+        assert_eq!(
+            foods[0].ingredients,
+            ["mxmxvkd", "kfcds", "sqjhc", "nhms"]
+                .iter()
+                .map(|s| s.to_string())
+                .collect::<Vec<_>>()
+        );
+        assert_eq!(
+            foods[0].allergens,
+            ["dairy", "fish"]
+                .iter()
+                .map(|s| s.to_string())
+                .collect::<Vec<_>>()
+        );
+    }
+    #[test]
+    fn part1() {
+        assert_eq!(solution1(&generator(INPUT)), 5);
+    }
+    #[test]
+    fn part2() {
+        assert_eq!(solution2(&generator(INPUT)), "mxmxvkd,sqjhc,fvjkl");
+    }
+    #[test]
+    fn non_allergens() {
+        assert_eq!(
+            find_non_allergens(&generator(INPUT)),
+            ["kfcds", "nhms", "sbzzf", "trh"]
+                .iter()
+                .map(|s| s.to_string())
+                .collect()
+        );
+    }
+
+    #[test]
+    fn count() {
+        let ingredients: HashSet<String> = vec!["kfcds", "nhms", "sbzzf", "trh"]
+            .iter()
+            .map(|s| s.to_string())
+            .collect();
+        let foods = generator(INPUT);
+        assert_eq!(count_ingredients(&foods, &ingredients), 5);
+    }
+}

2020/src/day22.rs

@@ -0,0 +1,561 @@
+//! --- Day 22: Crab Combat ---
+//! It only takes a few hours of sailing the ocean on a raft for boredom to sink in. Fortunately, you brought a small deck of space cards! You'd like to play a game of Combat, and there's even an opponent available: a small crab that climbed aboard your raft before you left.
+//!
+//! Fortunately, it doesn't take long to teach the crab the rules.
+//!
+//! Before the game starts, split the cards so each player has their own deck (your puzzle input). Then, the game consists of a series of rounds: both players draw their top card, and the player with the higher-valued card wins the round. The winner keeps both cards, placing them on the bottom of their own deck so that the winner's card is above the other card. If this causes a player to have all of the cards, they win, and the game ends.
+//!
+//! For example, consider the following starting decks:
+//!
+//! Player 1:
+//! 9
+//! 2
+//! 6
+//! 3
+//! 1
+//!
+//! Player 2:
+//! 5
+//! 8
+//! 4
+//! 7
+//! 10
+//! This arrangement means that player 1's deck contains 5 cards, with 9 on top and 1 on the bottom; player 2's deck also contains 5 cards, with 5 on top and 10 on the bottom.
+//!
+//! The first round begins with both players drawing the top card of their decks: 9 and 5. Player 1 has the higher card, so both cards move to the bottom of player 1's deck such that 9 is above 5. In total, it takes 29 rounds before a player has all of the cards:
+//!
+//! -- Round 1 --
+//! Player 1's deck: 9, 2, 6, 3, 1
+//! Player 2's deck: 5, 8, 4, 7, 10
+//! Player 1 plays: 9
+//! Player 2 plays: 5
+//! Player 1 wins the round!
+//!
+//! -- Round 2 --
+//! Player 1's deck: 2, 6, 3, 1, 9, 5
+//! Player 2's deck: 8, 4, 7, 10
+//! Player 1 plays: 2
+//! Player 2 plays: 8
+//! Player 2 wins the round!
+//!
+//! -- Round 3 --
+//! Player 1's deck: 6, 3, 1, 9, 5
+//! Player 2's deck: 4, 7, 10, 8, 2
+//! Player 1 plays: 6
+//! Player 2 plays: 4
+//! Player 1 wins the round!
+//!
+//! -- Round 4 --
+//! Player 1's deck: 3, 1, 9, 5, 6, 4
+//! Player 2's deck: 7, 10, 8, 2
+//! Player 1 plays: 3
+//! Player 2 plays: 7
+//! Player 2 wins the round!
+//!
+//! -- Round 5 --
+//! Player 1's deck: 1, 9, 5, 6, 4
+//! Player 2's deck: 10, 8, 2, 7, 3
+//! Player 1 plays: 1
+//! Player 2 plays: 10
+//! Player 2 wins the round!
+//!
+//! ...several more rounds pass...
+//!
+//! -- Round 27 --
+//! Player 1's deck: 5, 4, 1
+//! Player 2's deck: 8, 9, 7, 3, 2, 10, 6
+//! Player 1 plays: 5
+//! Player 2 plays: 8
+//! Player 2 wins the round!
+//!
+//! -- Round 28 --
+//! Player 1's deck: 4, 1
+//! Player 2's deck: 9, 7, 3, 2, 10, 6, 8, 5
+//! Player 1 plays: 4
+//! Player 2 plays: 9
+//! Player 2 wins the round!
+//!
+//! -- Round 29 --
+//! Player 1's deck: 1
+//! Player 2's deck: 7, 3, 2, 10, 6, 8, 5, 9, 4
+//! Player 1 plays: 1
+//! Player 2 plays: 7
+//! Player 2 wins the round!
+//!
+//!
+//! == Post-game results ==
+//! Player 1's deck:
+//! Player 2's deck: 3, 2, 10, 6, 8, 5, 9, 4, 7, 1
+//! Once the game ends, you can calculate the winning player's score. The bottom card in their deck is worth the value of the card multiplied by 1, the second-from-the-bottom card is worth the value of the card multiplied by 2, and so on. With 10 cards, the top card is worth the value on the card multiplied by 10. In this example, the winning player's score is:
+//!
+//!    3 * 10
+//! +  2 *  9
+//! + 10 *  8
+//! +  6 *  7
+//! +  8 *  6
+//! +  5 *  5
+//! +  9 *  4
+//! +  4 *  3
+//! +  7 *  2
+//! +  1 *  1
+//! = 306
+//! So, once the game ends, the winning player's score is 306.
+//!
+//! Play the small crab in a game of Combat using the two decks you just dealt. What is the winning player's score?
+//!
+//! --- Part Two ---
+//! You lost to the small crab! Fortunately, crabs aren't very good at recursion. To defend your honor as a Raft Captain, you challenge the small crab to a game of Recursive Combat.
+//!
+//! Recursive Combat still starts by splitting the cards into two decks (you offer to play with the same starting decks as before - it's only fair). Then, the game consists of a series of rounds with a few changes:
+//!
+//! Before either player deals a card, if there was a previous round in this game that had exactly the same cards in the same order in the same players' decks, the game instantly ends in a win for player 1. Previous rounds from other games are not considered. (This prevents infinite games of Recursive Combat, which everyone agrees is a bad idea.)
+//! Otherwise, this round's cards must be in a new configuration; the players begin the round by each drawing the top card of their deck as normal.
+//! If both players have at least as many cards remaining in their deck as the value of the card they just drew, the winner of the round is determined by playing a new game of Recursive Combat (see below).
+//! Otherwise, at least one player must not have enough cards left in their deck to recurse; the winner of the round is the player with the higher-value card.
+//! As in regular Combat, the winner of the round (even if they won the round by winning a sub-game) takes the two cards dealt at the beginning of the round and places them on the bottom of their own deck (again so that the winner's card is above the other card). Note that the winner's card might be the lower-valued of the two cards if they won the round due to winning a sub-game. If collecting cards by winning the round causes a player to have all of the cards, they win, and the game ends.
+//!
+//! Here is an example of a small game that would loop forever without the infinite game prevention rule:
+//!
+//! Player 1:
+//! 43
+//! 19
+//!
+//! Player 2:
+//! 2
+//! 29
+//! 14
+//! During a round of Recursive Combat, if both players have at least as many cards in their own decks as the number on the card they just dealt, the winner of the round is determined by recursing into a sub-game of Recursive Combat. (For example, if player 1 draws the 3 card, and player 2 draws the 7 card, this would occur if player 1 has at least 3 cards left and player 2 has at least 7 cards left, not counting the 3 and 7 cards that were drawn.)
+//!
+//! To play a sub-game of Recursive Combat, each player creates a new deck by making a copy of the next cards in their deck (the quantity of cards copied is equal to the number on the card they drew to trigger the sub-game). During this sub-game, the game that triggered it is on hold and completely unaffected; no cards are removed from players' decks to form the sub-game. (For example, if player 1 drew the 3 card, their deck in the sub-game would be copies of the next three cards in their deck.)
+//!
+//! Here is a complete example of gameplay, where Game 1 is the primary game of Recursive Combat:
+//!
+//! === Game 1 ===
+//!
+//! -- Round 1 (Game 1) --
+//! Player 1's deck: 9, 2, 6, 3, 1
+//! Player 2's deck: 5, 8, 4, 7, 10
+//! Player 1 plays: 9
+//! Player 2 plays: 5
+//! Player 1 wins round 1 of game 1!
+//!
+//! -- Round 2 (Game 1) --
+//! Player 1's deck: 2, 6, 3, 1, 9, 5
+//! Player 2's deck: 8, 4, 7, 10
+//! Player 1 plays: 2
+//! Player 2 plays: 8
+//! Player 2 wins round 2 of game 1!
+//!
+//! -- Round 3 (Game 1) --
+//! Player 1's deck: 6, 3, 1, 9, 5
+//! Player 2's deck: 4, 7, 10, 8, 2
+//! Player 1 plays: 6
+//! Player 2 plays: 4
+//! Player 1 wins round 3 of game 1!
+//!
+//! -- Round 4 (Game 1) --
+//! Player 1's deck: 3, 1, 9, 5, 6, 4
+//! Player 2's deck: 7, 10, 8, 2
+//! Player 1 plays: 3
+//! Player 2 plays: 7
+//! Player 2 wins round 4 of game 1!
+//!
+//! -- Round 5 (Game 1) --
+//! Player 1's deck: 1, 9, 5, 6, 4
+//! Player 2's deck: 10, 8, 2, 7, 3
+//! Player 1 plays: 1
+//! Player 2 plays: 10
+//! Player 2 wins round 5 of game 1!
+//!
+//! -- Round 6 (Game 1) --
+//! Player 1's deck: 9, 5, 6, 4
+//! Player 2's deck: 8, 2, 7, 3, 10, 1
+//! Player 1 plays: 9
+//! Player 2 plays: 8
+//! Player 1 wins round 6 of game 1!
+//!
+//! -- Round 7 (Game 1) --
+//! Player 1's deck: 5, 6, 4, 9, 8
+//! Player 2's deck: 2, 7, 3, 10, 1
+//! Player 1 plays: 5
+//! Player 2 plays: 2
+//! Player 1 wins round 7 of game 1!
+//!
+//! -- Round 8 (Game 1) --
+//! Player 1's deck: 6, 4, 9, 8, 5, 2
+//! Player 2's deck: 7, 3, 10, 1
+//! Player 1 plays: 6
+//! Player 2 plays: 7
+//! Player 2 wins round 8 of game 1!
+//!
+//! -- Round 9 (Game 1) --
+//! Player 1's deck: 4, 9, 8, 5, 2
+//! Player 2's deck: 3, 10, 1, 7, 6
+//! Player 1 plays: 4
+//! Player 2 plays: 3
+//! Playing a sub-game to determine the winner...
+//!
+//! === Game 2 ===
+//!
+//! -- Round 1 (Game 2) --
+//! Player 1's deck: 9, 8, 5, 2
+//! Player 2's deck: 10, 1, 7
+//! Player 1 plays: 9
+//! Player 2 plays: 10
+//! Player 2 wins round 1 of game 2!
+//!
+//! -- Round 2 (Game 2) --
+//! Player 1's deck: 8, 5, 2
+//! Player 2's deck: 1, 7, 10, 9
+//! Player 1 plays: 8
+//! Player 2 plays: 1
+//! Player 1 wins round 2 of game 2!
+//!
+//! -- Round 3 (Game 2) --
+//! Player 1's deck: 5, 2, 8, 1
+//! Player 2's deck: 7, 10, 9
+//! Player 1 plays: 5
+//! Player 2 plays: 7
+//! Player 2 wins round 3 of game 2!
+//!
+//! -- Round 4 (Game 2) --
+//! Player 1's deck: 2, 8, 1
+//! Player 2's deck: 10, 9, 7, 5
+//! Player 1 plays: 2
+//! Player 2 plays: 10
+//! Player 2 wins round 4 of game 2!
+//!
+//! -- Round 5 (Game 2) --
+//! Player 1's deck: 8, 1
+//! Player 2's deck: 9, 7, 5, 10, 2
+//! Player 1 plays: 8
+//! Player 2 plays: 9
+//! Player 2 wins round 5 of game 2!
+//!
+//! -- Round 6 (Game 2) --
+//! Player 1's deck: 1
+//! Player 2's deck: 7, 5, 10, 2, 9, 8
+//! Player 1 plays: 1
+//! Player 2 plays: 7
+//! Player 2 wins round 6 of game 2!
+//! The winner of game 2 is player 2!
+//!
+//! ...anyway, back to game 1.
+//! Player 2 wins round 9 of game 1!
+//!
+//! -- Round 10 (Game 1) --
+//! Player 1's deck: 9, 8, 5, 2
+//! Player 2's deck: 10, 1, 7, 6, 3, 4
+//! Player 1 plays: 9
+//! Player 2 plays: 10
+//! Player 2 wins round 10 of game 1!
+//!
+//! -- Round 11 (Game 1) --
+//! Player 1's deck: 8, 5, 2
+//! Player 2's deck: 1, 7, 6, 3, 4, 10, 9
+//! Player 1 plays: 8
+//! Player 2 plays: 1
+//! Player 1 wins round 11 of game 1!
+//!
+//! -- Round 12 (Game 1) --
+//! Player 1's deck: 5, 2, 8, 1
+//! Player 2's deck: 7, 6, 3, 4, 10, 9
+//! Player 1 plays: 5
+//! Player 2 plays: 7
+//! Player 2 wins round 12 of game 1!
+//!
+//! -- Round 13 (Game 1) --
+//! Player 1's deck: 2, 8, 1
+//! Player 2's deck: 6, 3, 4, 10, 9, 7, 5
+//! Player 1 plays: 2
+//! Player 2 plays: 6
+//! Playing a sub-game to determine the winner...
+//!
+//! === Game 3 ===
+//!
+//! -- Round 1 (Game 3) --
+//! Player 1's deck: 8, 1
+//! Player 2's deck: 3, 4, 10, 9, 7, 5
+//! Player 1 plays: 8
+//! Player 2 plays: 3
+//! Player 1 wins round 1 of game 3!
+//!
+//! -- Round 2 (Game 3) --
+//! Player 1's deck: 1, 8, 3
+//! Player 2's deck: 4, 10, 9, 7, 5
+//! Player 1 plays: 1
+//! Player 2 plays: 4
+//! Playing a sub-game to determine the winner...
+//!
+//! === Game 4 ===
+//!
+//! -- Round 1 (Game 4) --
+//! Player 1's deck: 8
+//! Player 2's deck: 10, 9, 7, 5
+//! Player 1 plays: 8
+//! Player 2 plays: 10
+//! Player 2 wins round 1 of game 4!
+//! The winner of game 4 is player 2!
+//!
+//! ...anyway, back to game 3.
+//! Player 2 wins round 2 of game 3!
+//!
+//! -- Round 3 (Game 3) --
+//! Player 1's deck: 8, 3
+//! Player 2's deck: 10, 9, 7, 5, 4, 1
+//! Player 1 plays: 8
+//! Player 2 plays: 10
+//! Player 2 wins round 3 of game 3!
+//!
+//! -- Round 4 (Game 3) --
+//! Player 1's deck: 3
+//! Player 2's deck: 9, 7, 5, 4, 1, 10, 8
+//! Player 1 plays: 3
+//! Player 2 plays: 9
+//! Player 2 wins round 4 of game 3!
+//! The winner of game 3 is player 2!
+//!
+//! ...anyway, back to game 1.
+//! Player 2 wins round 13 of game 1!
+//!
+//! -- Round 14 (Game 1) --
+//! Player 1's deck: 8, 1
+//! Player 2's deck: 3, 4, 10, 9, 7, 5, 6, 2
+//! Player 1 plays: 8
+//! Player 2 plays: 3
+//! Player 1 wins round 14 of game 1!
+//!
+//! -- Round 15 (Game 1) --
+//! Player 1's deck: 1, 8, 3
+//! Player 2's deck: 4, 10, 9, 7, 5, 6, 2
+//! Player 1 plays: 1
+//! Player 2 plays: 4
+//! Playing a sub-game to determine the winner...
+//!
+//! === Game 5 ===
+//!
+//! -- Round 1 (Game 5) --
+//! Player 1's deck: 8
+//! Player 2's deck: 10, 9, 7, 5
+//! Player 1 plays: 8
+//! Player 2 plays: 10
+//! Player 2 wins round 1 of game 5!
+//! The winner of game 5 is player 2!
+//!
+//! ...anyway, back to game 1.
+//! Player 2 wins round 15 of game 1!
+//!
+//! -- Round 16 (Game 1) --
+//! Player 1's deck: 8, 3
+//! Player 2's deck: 10, 9, 7, 5, 6, 2, 4, 1
+//! Player 1 plays: 8
+//! Player 2 plays: 10
+//! Player 2 wins round 16 of game 1!
+//!
+//! -- Round 17 (Game 1) --
+//! Player 1's deck: 3
+//! Player 2's deck: 9, 7, 5, 6, 2, 4, 1, 10, 8
+//! Player 1 plays: 3
+//! Player 2 plays: 9
+//! Player 2 wins round 17 of game 1!
+//! The winner of game 1 is player 2!
+//!
+//!
+//! == Post-game results ==
+//! Player 1's deck:
+//! Player 2's deck: 7, 5, 6, 2, 4, 1, 10, 8, 9, 3
+//! After the game, the winning player's score is calculated from the cards they have in their original deck using the same rules as regular Combat. In the above game, the winning player's score is 291.
+//!
+//! Defend your honor as Raft Captain by playing the small crab in a game of Recursive Combat using the same two decks as before. What is the winning player's score?
+
+use std::collections::{HashSet, VecDeque};
+
+use aoc_runner_derive::aoc;
+
+use crate::debug_println;
+
+#[derive(Clone, Debug, PartialEq)]
+struct Players {
+    p1: VecDeque<usize>,
+    p2: VecDeque<usize>,
+}
+
+fn generator(input: &str) -> Players {
+    let players: Vec<_> = input.split("\n\n").collect();
+    Players {
+        p1: players[0]
+            .split('\n')
+            .skip(1)
+            .map(|s| s.trim().parse().expect("couldn't parse p1 number"))
+            .collect::<VecDeque<usize>>(),
+        p2: players[1]
+            .split('\n')
+            .skip(1)
+            .map(|s| s.trim().parse().expect("couldn't parse p2 number"))
+            .collect::<VecDeque<usize>>(),
+    }
+}
+
+fn deck_to_str(deck: &VecDeque<usize>) -> String {
+    let mut s = format!("{}", deck.iter().nth(0).unwrap());
+    for c in deck.iter().skip(1) {
+        s = format!("{}, {}", s, c);
+    }
+
+    s
+}
+use std::sync::atomic::{AtomicUsize, Ordering};
+static GAME_NUM: AtomicUsize = AtomicUsize::new(1);
+impl Players {
+    fn play_recursive(&mut self, game: usize, parent_game: usize) -> bool {
+        debug_println!("=== Game {} ===\n", game);
+        let mut round = 0;
+        // For debug builds only.
+        let _ = round;
+        let _ = parent_game;
+        let mut previous_rounds = HashSet::new();
+        while !self.p1.is_empty() && !self.p2.is_empty() {
+            let p1s = deck_to_str(&self.p1);
+            let p2s = deck_to_str(&self.p2);
+            let deck_key = format!("{} *** {}", p1s, p2s);
+            if previous_rounds.contains(&deck_key) {
+                // Loop detected, p1 wins
+                return true;
+            }
+            debug_println!("{}: {}", game, deck_key);
+            previous_rounds.insert(deck_key);
+
+            let p1 = self.p1.pop_front().unwrap();
+            let p2 = self.p2.pop_front().unwrap();
+            round += 1;
+            debug_println!("-- Round {} (Game {}) --", round, game);
+            debug_println!("Player 1's deck: {}", p1s);
+            debug_println!("Player 2's deck: {}", p2s);
+            debug_println!("Player 1 plays: {}", p1);
+            debug_println!("Player 2 plays: {}", p2);
+            //dbg!(p1, self.p1.len(), p2, self.p2.len());
+            let p1_won = if p1 <= self.p1.len() && p2 <= self.p2.len() {
+                // Recurse
+                debug_println!("Playing a sub-game to determine the winner...\n");
+                let mut sub_game = self.clone();
+                sub_game.p1.truncate(p1);
+                sub_game.p2.truncate(p2);
+                let next_game = GAME_NUM.fetch_add(1, Ordering::SeqCst);
+                let p1_won = sub_game.play_recursive(next_game, game);
+                p1_won
+            } else {
+                p1 > p2
+            };
+
+            if p1_won {
+                debug_println!("Player 1 wins round {} of game {}!", round, game);
+                self.p1.push_back(p1);
+                self.p1.push_back(p2);
+            } else {
+                debug_println!("Player 2 wins round {} of game {}!", round, game);
+                self.p2.push_back(p2);
+                self.p2.push_back(p1);
+            }
+            debug_println!();
+        }
+        let p1_won = self.p1.len() > self.p2.len();
+        if p1_won {
+            debug_println!("The winner of game {} is player 1!", game);
+        } else {
+            debug_println!("The winner of game {} is player 2!", game);
+        }
+
+        debug_println!("...anyway, back to game {}.", parent_game);
+        p1_won
+    }
+
+    fn play(&mut self) {
+        //let mut round = 0;
+        while !self.p1.is_empty() && !self.p2.is_empty() {
+            let p1 = self.p1.pop_front().unwrap();
+            let p2 = self.p2.pop_front().unwrap();
+            //round += 1;
+            //println!("-- Round {} --", round);
+            //println!("Player 1's deck: {:?}", self.p1);
+            //println!("Player 2's deck: {:?}", self.p2);
+            //println!("Player 1 plays: {}", p1);
+            //println!("Player 2 plays: {}", p2);
+            if p1 > p2 {
+                //println!("Play 1 wins the round!");
+                self.p1.push_back(p1);
+                self.p1.push_back(p2);
+            } else {
+                //println!("Play 2 wins the round!");
+                self.p2.push_back(p2);
+                self.p2.push_back(p1);
+            }
+            //println!();
+        }
+    }
+    fn winning_score(&self) -> usize {
+        let winner = if self.p1.len() > self.p2.len() {
+            &self.p1
+        } else {
+            &self.p2
+        };
+        winner
+            .iter()
+            .rev()
+            .enumerate()
+            .map(|(i, n)| (i + 1) * *n)
+            .sum()
+    }
+}
+
+#[aoc(day22, part1)]
+fn solution1(input: &str) -> usize {
+    let mut players = generator(input);
+    players.play();
+    players.winning_score()
+}
+
+#[aoc(day22, part2)]
+fn solution2(input: &str) -> usize {
+    let mut players = generator(input);
+    players.play_recursive(GAME_NUM.fetch_add(1, Ordering::SeqCst), 0);
+    players.winning_score()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const INPUT: &'static str = r#"Player 1:
+        9
+        2
+        6
+        3
+        1
+
+        Player 2:
+        5
+        8
+        4
+        7
+        10"#;
+
+    #[test]
+    fn test_generator() {
+        assert_eq!(
+            generator(INPUT),
+            Players {
+                p1: vec![9, 2, 6, 3, 1].into(),
+                p2: vec![5, 8, 4, 7, 10].into(),
+            }
+        );
+    }
+
+    #[test]
+    fn test_solution1() {
+        assert_eq!(solution1(INPUT), 306);
+    }
+
+    #[test]
+    fn test_solution2() {
+        assert_eq!(solution2(INPUT), 291);
+    }
+}

2020/src/day23.rs

@@ -0,0 +1,461 @@
+//! --- Day 23: Crab Cups ---
+//! The small crab challenges you to a game! The crab is going to mix up some cups, and you have to predict where they'll end up.
+//!
+//! The cups will be arranged in a circle and labeled clockwise (your puzzle input). For example, if your labeling were 32415, there would be five cups in the circle; going clockwise around the circle from the first cup, the cups would be labeled 3, 2, 4, 1, 5, and then back to 3 again.
+//!
+//! Before the crab starts, it will designate the first cup in your list as the current cup. The crab is then going to do 100 moves.
+//!
+//! Each move, the crab does the following actions:
+//!
+//! The crab picks up the three cups that are immediately clockwise of the current cup. They are removed from the circle; cup spacing is adjusted as necessary to maintain the circle.
+//! The crab selects a destination cup: the cup with a label equal to the current cup's label minus one. If this would select one of the cups that was just picked up, the crab will keep subtracting one until it finds a cup that wasn't just picked up. If at any point in this process the value goes below the lowest value on any cup's label, it wraps around to the highest value on any cup's label instead.
+//! The crab places the cups it just picked up so that they are immediately clockwise of the destination cup. They keep the same order as when they were picked up.
+//! The crab selects a new current cup: the cup which is immediately clockwise of the current cup.
+//! For example, suppose your cup labeling were 389125467. If the crab were to do merely 10 moves, the following changes would occur:
+//!
+//! -- move 1 --
+//! cups: (3) 8  9  1  2  5  4  6  7
+//! pick up: 8, 9, 1
+//! destination: 2
+//!
+//! -- move 2 --
+//! cups:  3 (2) 8  9  1  5  4  6  7
+//! pick up: 8, 9, 1
+//! destination: 7
+//!
+//! -- move 3 --
+//! cups:  3  2 (5) 4  6  7  8  9  1
+//! pick up: 4, 6, 7
+//! destination: 3
+//!
+//! -- move 4 --
+//! cups:  7  2  5 (8) 9  1  3  4  6
+//! pick up: 9, 1, 3
+//! destination: 7
+//!
+//! -- move 5 --
+//! cups:  3  2  5  8 (4) 6  7  9  1
+//! pick up: 6, 7, 9
+//! destination: 3
+//!
+//! -- move 6 --
+//! cups:  9  2  5  8  4 (1) 3  6  7
+//! pick up: 3, 6, 7
+//! destination: 9
+//!
+//! -- move 7 --
+//! cups:  7  2  5  8  4  1 (9) 3  6
+//! pick up: 3, 6, 7
+//! destination: 8
+//!
+//! -- move 8 --
+//! cups:  8  3  6  7  4  1  9 (2) 5
+//! pick up: 5, 8, 3
+//! destination: 1
+//!
+//! -- move 9 --
+//! cups:  7  4  1  5  8  3  9  2 (6)
+//! pick up: 7, 4, 1
+//! destination: 5
+//!
+//! -- move 10 --
+//! cups: (5) 7  4  1  8  3  9  2  6
+//! pick up: 7, 4, 1
+//! destination: 3
+//!
+//! -- final --
+//! cups:  5 (8) 3  7  4  1  9  2  6
+//! In the above example, the cups' values are the labels as they appear moving clockwise around the circle; the current cup is marked with ( ).
+//!
+//! After the crab is done, what order will the cups be in? Starting after the cup labeled 1, collect the other cups' labels clockwise into a single string with no extra characters; each number except 1 should appear exactly once. In the above example, after 10 moves, the cups clockwise from 1 are labeled 9, 2, 6, 5, and so on, producing 92658374. If the crab were to complete all 100 moves, the order after cup 1 would be 67384529.
+//!
+//! Using your labeling, simulate 100 moves. What are the labels on the cups after cup 1?
+
+//! --- Part Two ---
+//! Due to what you can only assume is a mistranslation (you're not exactly fluent in Crab), you are quite surprised when the crab starts arranging many cups in a circle on your raft - one million (1000000) in total.
+//!
+//! Your labeling is still correct for the first few cups; after that, the remaining cups are just numbered in an increasing fashion starting from the number after the highest number in your list and proceeding one by one until one million is reached. (For example, if your labeling were 54321, the cups would be numbered 5, 4, 3, 2, 1, and then start counting up from 6 until one million is reached.) In this way, every number from one through one million is used exactly once.
+//!
+//! After discovering where you made the mistake in translating Crab Numbers, you realize the small crab isn't going to do merely 100 moves; the crab is going to do ten million (10000000) moves!
+//!
+//! The crab is going to hide your stars - one each - under the two cups that will end up immediately clockwise of cup 1. You can have them if you predict what the labels on those cups will be when the crab is finished.
+//!
+//! In the above example (389125467), this would be 934001 and then 159792; multiplying these together produces 149245887792.
+//!
+//! Determine which two cups will end up immediately clockwise of cup 1. What do you get if you multiply their labels together?
+
+use std::fmt;
+
+use aoc_runner_derive::aoc;
+
+use crate::debug_println;
+
+trait Hand {
+    fn play(&mut self, rounds: usize) {
+        use std::time::{Duration, Instant};
+        let start = Instant::now();
+        let mut last_report = Instant::now();
+        (0..rounds).for_each(|i| {
+            debug_println!("-- move {} --", i + 1);
+            if last_report.elapsed() > Duration::new(1, 0) {
+                let elapsed = start.elapsed();
+                let runtime = elapsed * rounds as u32 / i as u32;
+                let eta = runtime - elapsed;
+
+                println!(
+                    "{} steps ({}%) in {}s, Estimated runtime {}s, ETA {}s",
+                    i,
+                    100 * i / rounds,
+                    elapsed.as_secs_f32(),
+                    runtime.as_secs_f32(),
+                    eta.as_secs_f32(),
+                );
+                last_report = Instant::now();
+            }
+            self.step();
+        });
+    }
+    fn part1_answer(&self) -> String;
+    fn part2_answer(&self) -> usize;
+    fn step(&mut self);
+    fn test_cur_to_end(&self) -> Vec<usize>;
+}
+
+/// TODO(wathiede): redo based on this sentence from glenng:
+/// `So a circular linked list containing 2,1,3 would be [3,1,2]`
+#[derive(Debug)]
+struct FastHand {
+    // A cup labeled `1` will be represented by the index 0, in that cell will be the index of cup
+    // clockwise to `1`.
+    // Stores the next cup as indexed value (i.e. label-1).
+    cups: Vec<usize>,
+    cur: Cup,
+    min: usize,
+    max: usize,
+}
+
+/// Stores the label of a cup.  Use `as_idx` to compute the index into FastHand.cups. Use
+/// `from_idx` to build a `Cup` from a given index into FastHand.cups.
+#[derive(Copy, Clone, Debug, PartialEq)]
+struct Cup(usize);
+
+impl Cup {
+    fn new(val: usize) -> Cup {
+        Cup(val)
+    }
+    fn from_idx(idx: usize) -> Cup {
+        Cup(idx + 1)
+    }
+    fn as_idx(&self) -> usize {
+        self.0 - 1
+    }
+}
+
+impl FastHand {
+    fn new(s: &str) -> FastHand {
+        let data: Vec<_> = s.bytes().map(|s| (s - b'0') as usize).collect();
+        let min = *data.iter().min().unwrap();
+        let max = *data.iter().max().unwrap();
+        let mut cups = vec![0; max];
+        let mut last = 0;
+        data.windows(2).for_each(|nums| {
+            let cur_cup = Cup::new(nums[0]);
+            let next_cup = Cup::new(nums[1]);
+            last = next_cup.as_idx();
+            cups[cur_cup.as_idx()] = next_cup.as_idx();
+        });
+        let cur = Cup(data[0]);
+        cups[last] = cur.as_idx();
+        FastHand {
+            cups,
+            cur,
+            min,
+            max,
+        }
+    }
+    fn new_part2(s: &str) -> FastHand {
+        let mut data: Vec<_> = s.bytes().map(|s| (s - b'0') as usize).collect();
+        let min = *data.iter().min().unwrap();
+        let mut max = *data.iter().max().unwrap();
+        data.extend(max + 1..=1000000);
+        max = 1000000;
+        let mut cups = vec![0; max];
+        let mut last = 0;
+        data.windows(2).for_each(|nums| {
+            let cur_cup = Cup::new(nums[0]);
+            let next_cup = Cup::new(nums[1]);
+            last = next_cup.as_idx();
+            cups[cur_cup.as_idx()] = next_cup.as_idx();
+        });
+        let cur = Cup(data[0]);
+        cups[last] = cur.as_idx();
+        FastHand {
+            cups,
+            cur,
+            min,
+            max,
+        }
+    }
+
+    fn destination(&self, skip_vals: &[Cup]) -> Cup {
+        let mut search_val = Cup::new(self.cur.0 - 1);
+        while skip_vals.contains(&search_val) {
+            search_val = Cup::new(search_val.0 - 1);
+        }
+        if search_val.0 < self.min {
+            search_val = Cup::new(self.max);
+        }
+        while skip_vals.contains(&search_val) {
+            search_val = Cup::new(search_val.0 - 1);
+        }
+        search_val
+    }
+
+    fn next(&self, c: Cup) -> Cup {
+        //dbg!(c.as_idx(), self.cups[c.as_idx()]);
+        Cup::from_idx(self.cups[c.as_idx()])
+    }
+}
+
+impl fmt::Display for FastHand {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut cur = self.cur;
+        write!(f, "({}) ", cur.0)?;
+
+        for _ in 1..self.cups.len() {
+            cur = Cup::from_idx(self.cups[cur.as_idx()]);
+            write!(f, "{} ", cur.0)?;
+        }
+        Ok(())
+    }
+}
+
+impl Hand for FastHand {
+    fn step(&mut self) {
+        let mut cur = self.cur;
+        let three: Vec<_> = (0..3)
+            .map(|_| {
+                cur = self.next(cur);
+                cur
+            })
+            .collect();
+        let dst = self.destination(&three);
+        debug_println!(
+            "cur {} cups {} three {:?} destination {:?}",
+            self.cur.0,
+            self,
+            three,
+            dst
+        );
+        debug_println!("cups (raw) {:?}", self.cups);
+
+        // Cur points to whatever end of three used to.
+        self.cups[self.cur.as_idx()] = self.cups[three[2].as_idx()];
+
+        // End of three points to whatever dst used to point to.
+        self.cups[three[2].as_idx()] = self.cups[dst.as_idx()];
+
+        // Dst points to the beginning of three.
+        self.cups[dst.as_idx()] = three[0].as_idx();
+
+        // Cur points to whatever is next in the circle.
+        self.cur = self.next(self.cur);
+    }
+    fn test_cur_to_end(&self) -> Vec<usize> {
+        let mut res = Vec::with_capacity(self.cups.len());
+        let mut cur = self.cur;
+        (0..self.cups.len()).for_each(|_| {
+            res.push(cur.0);
+            cur = Cup::from_idx(self.cups[cur.as_idx()]);
+        });
+        res
+    }
+    fn part1_answer(&self) -> String {
+        let mut cur = Cup::new(1);
+        let mut s = "".to_string();
+        for _ in 1..self.cups.len() {
+            cur = self.next(cur);
+            s = format!("{}{}", s, cur.0);
+        }
+
+        s
+    }
+    fn part2_answer(&self) -> usize {
+        let one = Cup::new(1);
+        let v1 = self.next(one);
+        let v2 = self.next(v1);
+        v1.0 * v2.0
+    }
+}
+
+struct SlowHand {
+    cups: Vec<usize>,
+    cur: usize,
+    min: usize,
+    max: usize,
+}
+
+impl fmt::Display for SlowHand {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        for (i, cup) in self.cups.iter().enumerate() {
+            if i == self.cur {
+                write!(f, "({}) ", cup)?;
+            } else {
+                write!(f, "{} ", cup)?;
+            };
+        }
+        Ok(())
+    }
+}
+
+impl SlowHand {
+    #[allow(dead_code)]
+    fn new(s: &str) -> SlowHand {
+        let cups: Vec<_> = s.bytes().map(|s| (s - b'0') as usize).collect();
+        let min = *cups.iter().min().unwrap();
+        let max = *cups.iter().max().unwrap();
+        SlowHand {
+            cups,
+            cur: 0,
+            min,
+            max,
+        }
+    }
+}
+
+impl Hand for SlowHand {
+    fn part1_answer(&self) -> String {
+        let idx = self.cups.iter().position(|i| i == &1).unwrap();
+        let s = self.cups[idx + 1..]
+            .iter()
+            .fold("".to_string(), |acc, c| format!("{}{}", acc, c));
+        self.cups[..idx]
+            .iter()
+            .fold(s, |acc, c| format!("{}{}", acc, c))
+    }
+    fn step(&mut self) {
+        debug_println!("{}", self);
+        let cur = self.cups[self.cur];
+        let mut pickups = Vec::new();
+        let mut destination = self.cups[self.cur] - 1;
+        let mut rm_idx = (self.cur + 1) % self.cups.len();
+        (0..3).for_each(|_| {
+            pickups.push(self.cups.remove(rm_idx));
+            if rm_idx >= self.cups.len() {
+                rm_idx -= self.cups.len();
+            }
+        });
+        let cur = self.cups.iter().position(|i| i == &cur).unwrap();
+        let next = self.cups[(cur + 1) % self.cups.len()];
+
+        while pickups.contains(&destination) {
+            destination -= 1;
+        }
+        if destination < self.min {
+            destination = self.max;
+            while pickups.contains(&destination) {
+                destination -= 1;
+            }
+        }
+        //dbg!(&pickups, &self.cups, destination);
+        let idx = self.cups.iter().position(|i| i == &destination).unwrap();
+        debug_println!("pick up: {:?}", pickups);
+        debug_println!("destination: {}({})", destination, idx);
+        debug_println!("next destination: {}", next);
+
+        pickups
+            .into_iter()
+            .rev()
+            .for_each(|v| self.cups.insert(idx + 1, v));
+
+        self.cur = self.cups.iter().position(|i| i == &next).unwrap();
+    }
+
+    /// Return internal state in a way unit tests can use
+    fn test_cur_to_end(&self) -> Vec<usize> {
+        self.cups[self.cur..]
+            .iter()
+            .chain(self.cups[..self.cur].iter())
+            .cloned()
+            .collect()
+    }
+    fn part2_answer(&self) -> usize {
+        let one = self.cups.iter().position(|n| n == &1).unwrap();
+        self.cups[one + 1] * self.cups[one + 2]
+    }
+}
+
+#[aoc(day23, part1)]
+fn solution1(input: &str) -> String {
+    let mut hand = FastHand::new(input);
+    hand.play(100);
+    hand.part1_answer()
+}
+
+#[aoc(day23, part2)]
+fn solution2(input: &str) -> usize {
+    let mut hand = FastHand::new_part2(input);
+    hand.play(10_000_000);
+    hand.part2_answer()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const INPUT: &'static str = "389125467";
+
+    fn test_hand<H: Hand>(mut hand: H) {
+        let want = vec![
+            [3, 8, 9, 1, 2, 5, 4, 6, 7],
+            [2, 8, 9, 1, 5, 4, 6, 7, 3],
+            [5, 4, 6, 7, 8, 9, 1, 3, 2],
+            [8, 9, 1, 3, 4, 6, 7, 2, 5],
+            [4, 6, 7, 9, 1, 3, 2, 5, 8],
+            [1, 3, 6, 7, 9, 2, 5, 8, 4],
+            [9, 3, 6, 7, 2, 5, 8, 4, 1],
+            [2, 5, 8, 3, 6, 7, 4, 1, 9],
+            [6, 7, 4, 1, 5, 8, 3, 9, 2],
+            [5, 7, 4, 1, 8, 3, 9, 2, 6],
+            [8, 3, 7, 4, 1, 9, 2, 6, 5],
+        ];
+        want.iter().enumerate().for_each(|(step, want)| {
+            assert_eq!(hand.test_cur_to_end(), want, "step0 {}", step);
+            hand.step();
+        });
+    }
+    #[test]
+    fn slow_step() {
+        let hand = SlowHand::new(INPUT);
+        test_hand(hand);
+    }
+
+    #[test]
+    fn fast_step() {
+        let hand = FastHand::new(INPUT);
+        test_hand(hand);
+    }
+
+    #[test]
+    fn part1_10step_slow() {
+        let mut hand = SlowHand::new(INPUT);
+        hand.play(10);
+        assert_eq!(hand.part1_answer(), "92658374");
+    }
+
+    #[test]
+    fn part1_10step_fast() {
+        let mut hand = FastHand::new(INPUT);
+        hand.play(10);
+        assert_eq!(hand.part1_answer(), "92658374");
+    }
+    #[test]
+    fn part1() {
+        assert_eq!(solution1(INPUT), "67384529");
+    }
+    // This is too slow in debug mode due to debug_println, build in release to run.
+    #[cfg(not(debug_assertions))]
+    #[test]
+    fn part2() {
+        assert_eq!(solution2("389125467"), 149245887792);
+    }
+}

2020/src/day24.rs

@@ -0,0 +1,294 @@
+//! --- Day 24: Lobby Layout ---
+//! Your raft makes it to the tropical island; it turns out that the small crab was an excellent navigator. You make your way to the resort.
+//!
+//! As you enter the lobby, you discover a small problem: the floor is being renovated. You can't even reach the check-in desk until they've finished installing the new tile floor.
+//!
+//! The tiles are all hexagonal; they need to be arranged in a hex grid with a very specific color pattern. Not in the mood to wait, you offer to help figure out the pattern.
+//!
+//! The tiles are all white on one side and black on the other. They start with the white side facing up. The lobby is large enough to fit whatever pattern might need to appear there.
+//!
+//! A member of the renovation crew gives you a list of the tiles that need to be flipped over (your puzzle input). Each line in the list identifies a single tile that needs to be flipped by giving a series of steps starting from a reference tile in the very center of the room. (Every line starts from the same reference tile.)
+//!
+//! Because the tiles are hexagonal, every tile has six neighbors: east, southeast, southwest, west, northwest, and northeast. These directions are given in your list, respectively, as e, se, sw, w, nw, and ne. A tile is identified by a series of these directions with no delimiters; for example, esenee identifies the tile you land on if you start at the reference tile and then move one tile east, one tile southeast, one tile northeast, and one tile east.
+//!
+//! Each time a tile is identified, it flips from white to black or from black to white. Tiles might be flipped more than once. For example, a line like esew flips a tile immediately adjacent to the reference tile, and a line like nwwswee flips the reference tile itself.
+//!
+//! Here is a larger example:
+//!
+//! sesenwnenenewseeswwswswwnenewsewsw
+//! neeenesenwnwwswnenewnwwsewnenwseswesw
+//! seswneswswsenwwnwse
+//! nwnwneseeswswnenewneswwnewseswneseene
+//! swweswneswnenwsewnwneneseenw
+//! eesenwseswswnenwswnwnwsewwnwsene
+//! sewnenenenesenwsewnenwwwse
+//! wenwwweseeeweswwwnwwe
+//! wsweesenenewnwwnwsenewsenwwsesesenwne
+//! neeswseenwwswnwswswnw
+//! nenwswwsewswnenenewsenwsenwnesesenew
+//! enewnwewneswsewnwswenweswnenwsenwsw
+//! sweneswneswneneenwnewenewwneswswnese
+//! swwesenesewenwneswnwwneseswwne
+//! enesenwswwswneneswsenwnewswseenwsese
+//! wnwnesenesenenwwnenwsewesewsesesew
+//! nenewswnwewswnenesenwnesewesw
+//! eneswnwswnwsenenwnwnwwseeswneewsenese
+//! neswnwewnwnwseenwseesewsenwsweewe
+//! wseweeenwnesenwwwswnew
+//! In the above example, 10 tiles are flipped once (to black), and 5 more are flipped twice (to black, then back to white). After all of these instructions have been followed, a total of 10 tiles are black.
+//!
+//! Go through the renovation crew's list and determine which tiles they need to flip. After all of the instructions have been followed, how many tiles are left with the black side up?
+//!
+//! --- Part Two ---
+//! The tile floor in the lobby is meant to be a living art exhibit. Every day, the tiles are all flipped according to the following rules:
+//!
+//! Any black tile with zero or more than 2 black tiles immediately adjacent to it is flipped to white.
+//! Any white tile with exactly 2 black tiles immediately adjacent to it is flipped to black.
+//! Here, tiles immediately adjacent means the six tiles directly touching the tile in question.
+//!
+//! The rules are applied simultaneously to every tile; put another way, it is first determined which tiles need to be flipped, then they are all flipped at the same time.
+//!
+//! In the above example, the number of black tiles that are facing up after the given number of days has passed is as follows:
+//!
+//! Day 1: 15
+//! Day 2: 12
+//! Day 3: 25
+//! Day 4: 14
+//! Day 5: 23
+//! Day 6: 28
+//! Day 7: 41
+//! Day 8: 37
+//! Day 9: 49
+//! Day 10: 37
+//!
+//! Day 20: 132
+//! Day 30: 259
+//! Day 40: 406
+//! Day 50: 566
+//! Day 60: 788
+//! Day 70: 1106
+//! Day 80: 1373
+//! Day 90: 1844
+//! Day 100: 2208
+//! After executing this process a total of 100 times, there would be 2208 black tiles facing up.
+//!
+//! How many tiles will be black after 100 days?
+
+use std::collections::HashMap;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[derive(Debug, PartialEq)]
+enum Direction {
+    East,
+    SouthEast,
+    SouthWest,
+    West,
+    NorthWest,
+    NorthEast,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+struct TileCoord((isize, isize, isize));
+
+#[derive(Debug, PartialEq)]
+struct Tile {
+    directions: Vec<Direction>,
+}
+
+impl std::str::FromStr for Tile {
+    type Err = ();
+    fn from_str(s: &str) -> Result<Tile, ()> {
+        let mut it = s.bytes();
+        let mut directions = Vec::new();
+        use Direction::*;
+        while let Some(b) = it.next() {
+            match b {
+                b'n' => match it.next().unwrap() {
+                    b'e' => directions.push(NorthEast),
+                    b'w' => directions.push(NorthWest),
+                    c => panic!(format!("unexpected tile direction {}", c)),
+                },
+                b's' => match it.next().unwrap() {
+                    b'e' => directions.push(SouthEast),
+                    b'w' => directions.push(SouthWest),
+                    c => panic!(format!("unexpected tile direction {}", c)),
+                },
+                b'e' => directions.push(East),
+                b'w' => directions.push(West),
+                c => panic!(format!("unexpected tile direction {}", c)),
+            }
+        }
+        Ok(Tile { directions })
+    }
+}
+impl Tile {
+    fn coord(&self) -> TileCoord {
+        // Based on 'cube coordinates' from https://www.redblobgames.com/grids/hexagons/
+        TileCoord(
+            self.directions
+                .iter()
+                .fold((0, 0, 0), |(x, y, z), dir| match dir {
+                    Direction::East => (x + 1, y - 1, z),
+                    Direction::SouthEast => (x, y - 1, z + 1),
+                    Direction::SouthWest => (x - 1, y, z + 1),
+                    Direction::West => (x - 1, y + 1, z),
+                    Direction::NorthWest => (x, y + 1, z - 1),
+                    Direction::NorthEast => (x + 1, y, z - 1),
+                }),
+        )
+    }
+}
+
+#[aoc_generator(day24)]
+fn parse(input: &str) -> Vec<Tile> {
+    input
+        .split('\n')
+        .map(|l| l.parse().expect("Failed to parse tile"))
+        .collect()
+}
+
+fn follow_instructions(instructions: &[Tile]) -> HashMap<TileCoord, bool> {
+    // False == white
+    // True == black
+    // Default == white
+    let mut tiles: HashMap<TileCoord, bool> = HashMap::new();
+    instructions.iter().for_each(|t| {
+        let v = tiles.entry(t.coord()).or_insert(false);
+        *v = !*v;
+    });
+    tiles
+}
+
+#[aoc(day24, part1)]
+fn solution1(instructions: &[Tile]) -> usize {
+    let tiles = follow_instructions(instructions);
+    count_black(&tiles)
+}
+
+const NEIGHBOR_OFFSETS: [(isize, isize, isize); 6] = [
+    (-1, 1, 0),
+    (1, -1, 0),
+    (-1, 0, 1),
+    (1, 0, -1),
+    (0, -1, 1),
+    (0, 1, -1),
+];
+
+fn count_neighbors(coord: &TileCoord, tiles: &HashMap<TileCoord, bool>) -> usize {
+    let (x, y, z) = coord.0;
+    NEIGHBOR_OFFSETS
+        .iter()
+        .filter(|(x_o, y_o, z_o)| {
+            *tiles
+                .get(&TileCoord((x + x_o, y + y_o, z + z_o)))
+                .unwrap_or(&false)
+        })
+        .count()
+}
+
+fn count_black(tiles: &HashMap<TileCoord, bool>) -> usize {
+    tiles.values().filter(|v| **v).count()
+}
+
+fn step(tiles: HashMap<TileCoord, bool>) -> HashMap<TileCoord, bool> {
+    let mut output = HashMap::new();
+    tiles
+        .iter()
+        .filter_map(|(k, v)| if *v { Some(k) } else { None })
+        .for_each(|coord| {
+            match count_neighbors(coord, &tiles) {
+                1 | 2 => {
+                    // Leave black
+                    output.insert(*coord, true);
+                }
+                _ => {
+                    // 0 or >=2, default is white, so don't set anything in new map.
+                }
+            };
+
+            let (x, y, z) = coord.0;
+            // TODO search white neighbors.
+            NEIGHBOR_OFFSETS.iter().for_each(|(x_o, y_o, z_o)| {
+                let coord = TileCoord((x + x_o, y + y_o, z + z_o));
+                if *tiles.get(&coord).unwrap_or(&false) {
+                    // Black, we can skip
+                    return;
+                }
+                if count_neighbors(&coord, &tiles) == 2 {
+                    output.insert(coord, true);
+                }
+            });
+        });
+    output
+}
+
+#[aoc(day24, part2)]
+fn solution2(instructions: &[Tile]) -> usize {
+    let tiles = follow_instructions(instructions);
+    let tiles = (0..100).fold(tiles, |tiles, _| step(tiles));
+    count_black(&tiles)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const INPUT: &'static str = r#"
+sesenwnenenewseeswwswswwnenewsewsw
+neeenesenwnwwswnenewnwwsewnenwseswesw
+seswneswswsenwwnwse
+nwnwneseeswswnenewneswwnewseswneseene
+swweswneswnenwsewnwneneseenw
+eesenwseswswnenwswnwnwsewwnwsene
+sewnenenenesenwsewnenwwwse
+wenwwweseeeweswwwnwwe
+wsweesenenewnwwnwsenewsenwwsesesenwne
+neeswseenwwswnwswswnw
+nenwswwsewswnenenewsenwsenwnesesenew
+enewnwewneswsewnwswenweswnenwsenwsw
+sweneswneswneneenwnewenewwneswswnese
+swwesenesewenwneswnwwneseswwne
+enesenwswwswneneswsenwnewswseenwsese
+wnwnesenesenenwwnenwsewesewsesesew
+nenewswnwewswnenesenwnesewesw
+eneswnwswnwsenenwnwnwwseeswneewsenese
+neswnwewnwnwseenwseesewsenwsweewe
+wseweeenwnesenwwwswnew
+"#;
+
+    #[test]
+    fn tile() {
+        use Direction::*;
+        assert_eq!(
+            "esenee".parse::<Tile>().expect("failed to parse tile"),
+            Tile {
+                directions: vec![East, SouthEast, NorthEast, East]
+            }
+        );
+    }
+
+    #[test]
+    fn part1() {
+        assert_eq!(solution1(&parse(INPUT)), 10);
+    }
+
+    #[test]
+    fn test_step() {
+        let instructions = parse(INPUT);
+        let tiles = follow_instructions(&instructions);
+        let wants = vec![15, 12, 25, 14, 23, 28, 41, 37, 49, 37];
+        wants
+            .iter()
+            .enumerate()
+            .fold(tiles, |mut tiles, (i, want)| {
+                tiles = step(tiles);
+                assert_eq!(count_black(&tiles), *want, "step {}", i);
+                tiles
+            });
+    }
+
+    #[test]
+    fn part2() {
+        assert_eq!(solution2(&parse(INPUT)), 2208);
+    }
+}

2020/src/day25.rs

@@ -0,0 +1,114 @@
+//! --- Day 25: Combo Breaker ---
+//! You finally reach the check-in desk. Unfortunately, their registration systems are currently offline, and they cannot check you in. Noticing the look on your face, they quickly add that tech support is already on the way! They even created all the room keys this morning; you can take yours now and give them your room deposit once the registration system comes back online.
+//!
+//! The room key is a small RFID card. Your room is on the 25th floor and the elevators are also temporarily out of service, so it takes what little energy you have left to even climb the stairs and navigate the halls. You finally reach the door to your room, swipe your card, and - beep - the light turns red.
+//!
+//! Examining the card more closely, you discover a phone number for tech support.
+//!
+//! "Hello! How can we help you today?" You explain the situation.
+//!
+//! "Well, it sounds like the card isn't sending the right command to unlock the door. If you go back to the check-in desk, surely someone there can reset it for you." Still catching your breath, you describe the status of the elevator and the exact number of stairs you just had to climb.
+//!
+//! "I see! Well, your only other option would be to reverse-engineer the cryptographic handshake the card does with the door and then inject your own commands into the data stream, but that's definitely impossible." You thank them for their time.
+//!
+//! Unfortunately for the door, you know a thing or two about cryptographic handshakes.
+//!
+//! The handshake used by the card and the door involves an operation that transforms a subject number. To transform a subject number, start with the value 1. Then, a number of times called the loop size, perform the following steps:
+//!
+//! Set the value to itself multiplied by the subject number.
+//! Set the value to the remainder after dividing the value by 20201227.
+//! The card always uses a specific, secret loop size when it transforms a subject number. The door always uses a different, secret loop size.
+//!
+//! The cryptographic handshake works like this:
+//!
+//! The card transforms the subject number of 7 according to the card's secret loop size. The result is called the card's public key.
+//! The door transforms the subject number of 7 according to the door's secret loop size. The result is called the door's public key.
+//! The card and door use the wireless RFID signal to transmit the two public keys (your puzzle input) to the other device. Now, the card has the door's public key, and the door has the card's public key. Because you can eavesdrop on the signal, you have both public keys, but neither device's loop size.
+//! The card transforms the subject number of the door's public key according to the card's loop size. The result is the encryption key.
+//! The door transforms the subject number of the card's public key according to the door's loop size. The result is the same encryption key as the card calculated.
+//! If you can use the two public keys to determine each device's loop size, you will have enough information to calculate the secret encryption key that the card and door use to communicate; this would let you send the unlock command directly to the door!
+//!
+//! For example, suppose you know that the card's public key is 5764801. With a little trial and error, you can work out that the card's loop size must be 8, because transforming the initial subject number of 7 with a loop size of 8 produces 5764801.
+//!
+//! Then, suppose you know that the door's public key is 17807724. By the same process, you can determine that the door's loop size is 11, because transforming the initial subject number of 7 with a loop size of 11 produces 17807724.
+//!
+//! At this point, you can use either device's loop size with the other device's public key to calculate the encryption key. Transforming the subject number of 17807724 (the door's public key) with a loop size of 8 (the card's loop size) produces the encryption key, 14897079. (Transforming the subject number of 5764801 (the card's public key) with a loop size of 11 (the door's loop size) produces the same encryption key: 14897079.)
+//!
+//! What encryption key is the handshake trying to establish?
+
+//! --- Part Two ---
+//! The light turns green and the door unlocks. As you collapse onto the bed in your room, your pager goes off!
+//!
+//! "It's an emergency!" the Elf calling you explains. "The soft serve machine in the cafeteria on sub-basement 7 just failed and you're the only one that knows how to fix it! We've already dispatched a reindeer to your location to pick you up."
+//!
+//! You hear the sound of hooves landing on your balcony.
+//!
+//! The reindeer carefully explores the contents of your room while you figure out how you're going to pay the 50 stars you owe the resort before you leave. Noticing that you look concerned, the reindeer wanders over to you; you see that it's carrying a small pouch.
+//!
+//! "Sorry for the trouble," a note in the pouch reads. Sitting at the bottom of the pouch is a gold coin with a little picture of a starfish on it.
+//!
+//! Looks like you only needed 49 stars after all.
+//!
+//! You don't have enough stars to pay the deposit, though. You need 2 more.
+
+use aoc_runner_derive::aoc;
+
+const MOD: usize = 20201227;
+const SUBJECT_NUM: usize = 7;
+// Returns loop size for given initial state.
+fn solve(subject: usize, pk: usize) -> usize {
+    let mut acc = subject;
+    (0..)
+        .position(|_| {
+            acc = (acc * subject) % MOD;
+            acc == pk
+        })
+        .unwrap()
+        + 1
+}
+
+fn find_encryption_key(pk0: usize, pk1: usize, subject: usize) -> usize {
+    //let l0 = solve(subject, pk0);
+    let l1 = solve(subject, pk1);
+    //(0..l0).fold(pk1, |acc, _| (acc * pk1) % MOD);
+    (0..l1).fold(pk0, |acc, _| (acc * pk0) % MOD)
+}
+
+#[aoc(day25, part1)]
+fn solution1(input: &str) -> usize {
+    let pks: Vec<usize> = input
+        .split('\n')
+        .map(|l| l.parse::<usize>().expect("couldn't parse public key"))
+        .collect();
+    find_encryption_key(pks[0], pks[1], SUBJECT_NUM)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const CARD_PUBKEY: usize = 5764801;
+    const DOOR_PUBKEY: usize = 17807724;
+    #[test]
+    fn loop_solver() {
+        // Puzzle gives input in 1's based numbering.
+        assert_eq!(solve(SUBJECT_NUM, CARD_PUBKEY), 8 - 1);
+        assert_eq!(solve(SUBJECT_NUM, DOOR_PUBKEY), 11 - 1);
+    }
+
+    #[test]
+    fn enc_solver() {
+        assert_eq!(
+            find_encryption_key(CARD_PUBKEY, DOOR_PUBKEY, SUBJECT_NUM),
+            14897079
+        );
+    }
+
+    #[test]
+    fn part1() {
+        assert_eq!(
+            solution1(&format!("{}\n{}", CARD_PUBKEY, DOOR_PUBKEY)),
+            14897079
+        )
+    }
+}

2020/src/lib.rs

@@ -7,9 +7,15 @@ pub mod day14;
 pub mod day15;
 pub mod day16;
 pub mod day17;
-//pub mod day18;
+pub mod day18;
 pub mod day19;
 pub mod day2;
+pub mod day20;
+pub mod day21;
+pub mod day22;
+pub mod day23;
+pub mod day24;
+pub mod day25;
 pub mod day3;
 pub mod day4;
 pub mod day5;
@@ -20,4 +26,14 @@ pub mod day9;
 
 use aoc_runner_derive::aoc_lib;
 
+#[macro_export]
+macro_rules! debug_print{
+    ($($arg:tt)*) => (#[cfg(debug_assertions)] print!($($arg)*));
+}
+
+#[macro_export]
+macro_rules! debug_println {
+    ($($arg:tt)*) => (#[cfg(debug_assertions)] println!($($arg)*));
+}
+
 aoc_lib! { year = 2020 }

2021/Cargo.lock

@@ -0,0 +1,225 @@
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+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+
+[[package]]
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+version = "0.1.0"
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+ "advent",
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+ "aoc-runner",
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+ "thiserror",
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
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2021/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "advent2021"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ansi_term = "0.12.1"
+anyhow = "1.0.45"
+aoc-runner = "0.3.0"
+aoc-runner-derive = "0.3.0"
+pretty_assertions = "1.0.0"
+thiserror = "1.0.30"
+advent = { path = "../" }

2021/input/2021/day10.txt

@@ -0,0 +1,98 @@
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2021/input/2021/day11.txt

@@ -0,0 +1,10 @@
+7313511551
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+2374331571
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+6511566287
+6727245532
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+2348138263
+2417483121
+8812617112

2021/input/2021/day12.txt

@@ -0,0 +1,22 @@
+zs-WO
+zs-QJ
+WO-zt
+zs-DP
+WO-end
+gv-zt
+iu-SK
+HW-zs
+iu-WO
+gv-WO
+gv-start
+gv-DP
+start-WO
+HW-zt
+iu-HW
+gv-HW
+zs-SK
+HW-end
+zs-end
+DP-by
+DP-iu
+zt-start

2021/input/2021/day13.txt

@@ -0,0 +1,910 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6

2021/input/2021/day14.txt

@@ -0,0 +1,102 @@
+VHCKBFOVCHHKOHBPNCKO
+
+SO -> F
+OP -> V
+NF -> F
+BO -> V
+BH -> S
+VB -> B
+SV -> B
+BK -> S
+KC -> N
+SP -> O
+CP -> O
+VN -> O
+HO -> S
+PC -> B
+CS -> O
+PO -> K
+KF -> B
+BP -> K
+VO -> O
+HB -> N
+PH -> O
+FF -> O
+FB -> K
+CC -> H
+FK -> F
+HV -> P
+CO -> S
+OC -> N
+KV -> V
+SS -> O
+FC -> O
+NP -> B
+OH -> B
+OF -> K
+KB -> K
+BN -> C
+OK -> C
+NC -> O
+NO -> O
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+VP -> K
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+VS -> B
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+KH -> P
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+FH -> F
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+BS -> V
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+OS -> K
+BC -> H
+OV -> N
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+VH -> N
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+PV -> K
+VC -> N
+PF -> S
+NB -> B
+PP -> S
+NS -> F
+PB -> B
+CV -> C
+HK -> P
+PK -> S
+NH -> B
+SH -> V
+KO -> H
+NV -> B
+HH -> V
+FO -> O
+CK -> O
+VK -> F
+HF -> O
+BF -> C
+BV -> P
+KN -> K
+VF -> C
+FN -> V
+ON -> C
+SF -> F
+SC -> C
+OO -> S
+FP -> K
+PS -> C
+NK -> O
+BB -> V
+HC -> H
+FV -> V
+CH -> N
+HS -> V
+CF -> F
+CN -> S

2021/input/2021/day15.txt

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2021/input/2021/day16.txt

@@ -0,0 +1 @@
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2021/input/2021/day17.txt

@@ -0,0 +1 @@
+target area: x=88..125, y=-157..-103

2021/input/2021/day18.txt

@@ -0,0 +1,100 @@
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2021/input/2021/day20.txt

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2021/input/2021/day21.txt

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2021/input/2021/day22.txt

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+on x=-32143..-25109,y=62219..88867,z=1027..29516

2021/input/2021/day23.txt

@@ -0,0 +1,5 @@
+#############
+#...........#
+###D#A#C#D###
+  #C#A#B#B#
+  #########

2021/input/2021/day4.txt

@@ -0,0 +1,601 @@
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2021/input/2021/day5.txt

@@ -0,0 +1,500 @@
+217,490 -> 217,764
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+161,663 -> 345,663
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+987,969 -> 57,39
+64,813 -> 64,468
+814,85 -> 469,85
+667,749 -> 154,236
+755,337 -> 755,50
+536,185 -> 536,217
+732,48 -> 529,48
+33,578 -> 430,578
+511,658 -> 669,658
+294,352 -> 353,352
+109,937 -> 820,226
+465,346 -> 465,114
+878,965 -> 34,121
+259,933 -> 576,933
+240,750 -> 240,296
+567,633 -> 899,965
+29,609 -> 169,469
+962,532 -> 962,921
+443,875 -> 395,875
+831,584 -> 510,263
+859,35 -> 84,810
+829,285 -> 829,463
+486,661 -> 883,661
+371,672 -> 959,84
+722,532 -> 722,241
+49,216 -> 468,216
+308,343 -> 308,277
+183,626 -> 264,545
+748,611 -> 356,611
+67,85 -> 925,943
+726,972 -> 726,272
+841,222 -> 841,867
+597,250 -> 813,250
+20,631 -> 555,631
+803,846 -> 589,632
+276,654 -> 222,708
+400,952 -> 672,952
+939,173 -> 534,173
+638,316 -> 638,935
+578,120 -> 578,101
+54,457 -> 723,457
+904,713 -> 904,721
+902,180 -> 99,983
+590,426 -> 174,10
+740,975 -> 309,975
+84,242 -> 803,961
+28,667 -> 362,333
+73,703 -> 73,354
+902,26 -> 902,365
+602,455 -> 578,431
+339,686 -> 339,846
+764,444 -> 311,444
+780,535 -> 862,453
+333,127 -> 911,127
+451,296 -> 451,832
+849,681 -> 849,580
+309,672 -> 309,913
+339,411 -> 147,411
+907,478 -> 974,545
+444,753 -> 855,342
+642,285 -> 683,244
+307,633 -> 751,633
+292,128 -> 767,603
+969,92 -> 647,414
+80,120 -> 942,982
+886,810 -> 740,810
+205,846 -> 168,846
+878,230 -> 72,230
+186,822 -> 628,822
+472,66 -> 472,609
+251,753 -> 129,753
+575,959 -> 102,959
+582,194 -> 858,194
+43,986 -> 43,589
+355,402 -> 751,402
+982,292 -> 86,292
+329,966 -> 329,379
+475,291 -> 475,924
+625,70 -> 625,350
+358,467 -> 981,467
+319,700 -> 736,283
+657,247 -> 654,247
+450,803 -> 450,497
+812,15 -> 812,425
+649,160 -> 377,160
+684,491 -> 690,491
+925,429 -> 772,429
+138,91 -> 883,91
+602,121 -> 774,293
+700,531 -> 451,531
+250,216 -> 800,766
+550,784 -> 289,784
+53,759 -> 228,759
+678,310 -> 645,343
+147,70 -> 171,46
+130,653 -> 130,103
+292,640 -> 731,640
+797,762 -> 618,762
+154,75 -> 964,885
+222,523 -> 557,523
+989,103 -> 989,964
+335,61 -> 422,61
+782,954 -> 160,332
+82,929 -> 82,528
+732,540 -> 635,637
+950,362 -> 798,362
+415,566 -> 916,566
+588,446 -> 743,291
+495,46 -> 495,435
+913,561 -> 303,561
+788,902 -> 788,698
+81,783 -> 715,149
+867,990 -> 867,558
+145,919 -> 145,725
+850,861 -> 727,861
+535,129 -> 535,496
+922,772 -> 922,917
+882,559 -> 672,349
+496,80 -> 496,948
+915,244 -> 516,643
+633,461 -> 748,461
+899,341 -> 677,341
+66,981 -> 878,169
+68,24 -> 984,940
+12,880 -> 23,869
+779,514 -> 779,752
+878,641 -> 949,641
+264,919 -> 229,919
+213,281 -> 213,196
+538,149 -> 538,278
+184,478 -> 364,298
+301,136 -> 923,758
+559,266 -> 559,986
+384,37 -> 384,558
+815,529 -> 800,514
+33,80 -> 624,80
+561,261 -> 215,607
+169,944 -> 169,921
+673,42 -> 164,42
+820,977 -> 424,581
+816,29 -> 802,29
+374,924 -> 121,671
+962,555 -> 426,19
+982,199 -> 860,77
+334,62 -> 359,62
+960,785 -> 260,85
+681,280 -> 860,280
+184,925 -> 184,30
+332,398 -> 858,924
+405,270 -> 218,270
+261,846 -> 29,614
+591,941 -> 591,716
+313,502 -> 313,637
+930,259 -> 779,259
+432,15 -> 566,149
+51,182 -> 223,182
+603,536 -> 603,281
+139,703 -> 825,17
+965,22 -> 55,932
+389,608 -> 771,608
+209,617 -> 923,617
+769,672 -> 769,236
+163,717 -> 638,717
+801,604 -> 136,604
+974,881 -> 110,17
+187,226 -> 929,968
+430,949 -> 473,949
+899,279 -> 899,224
+964,806 -> 964,876
+635,190 -> 349,190
+142,656 -> 142,216
+740,814 -> 35,109
+588,956 -> 534,956
+107,968 -> 707,968
+787,639 -> 787,50
+964,491 -> 964,148
+30,70 -> 30,323
+30,905 -> 806,129
+592,419 -> 91,419
+73,87 -> 973,987
+540,683 -> 540,139
+422,107 -> 422,90
+935,74 -> 935,590
+728,566 -> 188,26
+839,313 -> 839,620
+723,898 -> 723,719
+679,814 -> 679,617
+203,633 -> 417,633
+36,812 -> 546,302
+112,316 -> 598,802
+798,773 -> 989,964
+914,69 -> 520,69
+213,556 -> 213,19
+795,516 -> 795,220
+348,803 -> 664,803
+910,861 -> 238,189
+633,691 -> 594,691
+96,166 -> 96,60
+278,848 -> 854,272
+64,370 -> 64,815
+386,196 -> 386,222
+888,330 -> 888,834
+166,482 -> 37,482
+594,283 -> 594,865
+515,267 -> 515,448
+707,279 -> 239,747
+302,745 -> 302,268
+210,830 -> 885,155
+592,180 -> 592,324
+245,154 -> 245,613
+607,954 -> 545,954
+854,951 -> 19,116
+77,878 -> 963,878
+759,585 -> 759,892
+750,918 -> 750,130
+62,716 -> 329,983
+785,880 -> 785,590
+318,794 -> 318,599
+403,547 -> 719,863
+742,803 -> 742,937
+680,579 -> 680,425
+268,404 -> 826,962
+425,959 -> 710,959
+406,823 -> 976,253
+359,361 -> 165,361
+276,861 -> 657,480
+74,260 -> 743,929
+194,129 -> 194,651
+879,835 -> 65,21
+16,977 -> 980,13
+538,525 -> 624,439
+985,789 -> 985,510
+699,850 -> 560,711
+301,48 -> 477,224
+28,938 -> 905,61
+844,530 -> 793,530
+286,325 -> 936,975
+368,122 -> 677,431
+924,153 -> 924,774
+783,498 -> 783,148
+250,392 -> 578,392
+465,345 -> 573,345
+860,763 -> 860,40
+373,226 -> 599,226
+169,562 -> 169,292
+408,123 -> 569,123
+510,396 -> 733,396
+199,20 -> 199,770
+892,631 -> 237,631
+671,863 -> 705,863
+141,530 -> 141,630
+467,159 -> 367,159
+729,501 -> 255,975
+578,871 -> 578,225
+821,363 -> 821,820

2021/input/2021/day6.txt

@@ -0,0 +1 @@
+1,1,1,3,3,2,1,1,1,1,1,4,4,1,4,1,4,1,1,4,1,1,1,3,3,2,3,1,2,1,1,1,1,1,1,1,3,4,1,1,4,3,1,2,3,1,1,1,5,2,1,1,1,1,2,1,2,5,2,2,1,1,1,3,1,1,1,4,1,1,1,1,1,3,3,2,1,1,3,1,4,1,2,1,5,1,4,2,1,1,5,1,1,1,1,4,3,1,3,2,1,4,1,1,2,1,4,4,5,1,3,1,1,1,1,2,1,4,4,1,1,1,3,1,5,1,1,1,1,1,3,2,5,1,5,4,1,4,1,3,5,1,2,5,4,3,3,2,4,1,5,1,1,2,4,1,1,1,1,2,4,1,2,5,1,4,1,4,2,5,4,1,1,2,2,4,1,5,1,4,3,3,2,3,1,2,3,1,4,1,1,1,3,5,1,1,1,3,5,1,1,4,1,4,4,1,3,1,1,1,2,3,3,2,5,1,2,1,1,2,2,1,3,4,1,3,5,1,3,4,3,5,1,1,5,1,3,3,2,1,5,1,1,3,1,1,3,1,2,1,3,2,5,1,3,1,1,3,5,1,1,1,1,2,1,2,4,4,4,2,2,3,1,5,1,2,1,3,3,3,4,1,1,5,1,3,2,4,1,5,5,1,4,4,1,4,4,1,1,2

2021/input/2021/day7.txt

@@ -0,0 +1 @@
+1101,1,29,67,1102,0,1,65,1008,65,35,66,1005,66,28,1,67,65,20,4,0,1001,65,1,65,1106,0,8,99,35,67,101,99,105,32,110,39,101,115,116,32,112,97,115,32,117,110,101,32,105,110,116,99,111,100,101,32,112,114,111,103,114,97,109,10,160,1267,277,1068,422,1235,790,1391,45,252,513,1029,414,216,409,1373,1419,1176,757,64,748,835,20,436,147,347,1264,1532,240,272,430,7,85,51,12,107,1277,779,867,260,802,361,89,754,206,80,25,559,220,657,178,186,2,31,825,290,144,379,0,1682,1166,1241,180,102,464,444,122,718,25,100,1050,1358,604,546,1157,130,59,127,1351,238,97,75,821,265,23,786,116,115,93,730,1340,777,1114,263,352,115,5,69,1041,101,1222,203,1273,217,28,976,425,480,7,124,45,192,860,312,1107,1040,137,306,523,692,590,562,789,383,145,86,297,791,240,697,22,230,834,963,837,1164,1758,487,414,86,1026,1034,478,613,1,769,85,980,935,1455,16,204,170,380,324,14,699,220,50,451,738,52,437,963,718,178,508,711,1739,936,1515,246,908,126,602,295,591,22,484,752,1,1442,167,132,52,613,1172,353,36,56,468,123,393,765,1456,218,269,6,20,649,727,454,86,640,1113,836,124,405,571,882,107,75,730,346,94,35,626,1174,299,392,1449,502,854,500,128,852,248,645,159,774,155,884,1336,285,426,0,269,466,1483,93,13,17,255,295,530,694,1178,968,612,224,160,32,1154,194,494,24,845,43,274,344,301,486,43,351,581,929,168,1629,163,206,98,1242,1242,1706,1777,721,293,1621,132,199,12,66,247,1244,333,445,154,795,70,424,11,826,835,250,288,408,516,822,411,69,636,521,152,67,401,531,186,933,515,780,490,201,369,111,266,952,400,677,372,548,1325,1111,17,543,1293,20,507,74,116,656,644,872,35,80,1273,279,475,1585,1446,651,1338,285,284,23,1130,237,843,121,53,81,573,5,956,276,553,1084,544,731,35,16,53,34,405,1337,665,303,10,108,1132,233,3,834,415,161,409,1055,202,707,296,341,57,521,548,15,137,359,57,388,282,267,293,1450,28,424,819,941,1388,474,687,87,271,1462,522,33,26,841,345,104,150,573,481,297,1075,489,420,424,340,504,685,105,898,870,206,129,516,492,42,216,1829,1317,10,60,54,255,103,457,257,101,93,981,412,67,519,574,169,799,381,1509,60,409,51,151,464,1676,916,18,30,772,1566,1283,359,1260,10,405,750,160,181,541,358,213,300,1073,328,399,214,119,478,889,65,56,1077,1427,52,359,90,42,1248,336,51,1396,509,237,785,440,806,339,99,354,640,272,665,772,135,91,11,175,128,482,1244,1243,629,137,140,1003,626,433,391,731,1180,671,169,710,1561,385,1281,272,236,318,207,1323,16,233,9,720,295,34,183,362,987,1016,366,760,1244,878,600,275,1209,41,792,951,85,636,125,217,342,184,581,1300,66,165,804,285,756,96,278,598,163,655,138,869,537,141,1364,897,406,617,65,444,244,494,172,119,358,1183,310,226,98,550,634,948,985,247,1499,729,165,371,939,299,761,477,1480,840,3,319,675,492,564,3,3,80,182,69,460,341,789,742,46,1309,360,48,296,363,946,214,252,54,147,435,85,276,1072,23,71,755,572,268,1362,619,639,365,623,1560,322,535,997,1021,317,663,82,314,857,16,194,363,24,240,1596,1123,242,816,116,645,64,38,589,428,147,632,457,555,908,921,202,182,403,551,358,483,1195,1213,28,1156,725,320,16,74,931,103,145,146,1206,433,1052,158,531,699,675,379,393,475,384,1041,141,1248,521,136,326,199,725,200,465,796,724,672,569,70,663,15,150,131,1261,17,1211,66,175,608,17,81,551,627,1469,1032,342,2,972,184,798,960,22,55,462,1,151,91,119,76,1062,96,1424,567,366,831,633,205,691,50,1314,732,558,167,1624,5,147,47,110,250,935,177,445,79,306,653,47,75,626,173,104,354,573,523,46,46,757,541,431,1129,787,502,1328,1093,82,872,1876,1386,136,504,273,194,297,0,163,1025,996,354,1457,1127,52,45,1364,1128,457,1576,282,573,1648,16,28,582,768,92,92,817,1515,297,349,97,1523,634,923,76,1174,552,347,750,326,221,149,0,188,791,251,113,1,71,92,393,103,618,335,97,236,418,256,764,435,411,941,74,423,443,27,427,178,262,181,362,156,572,324,684,796,249,288,413,132,29,444,766,1135,1235,208,231,620,1481,228,174,133,918,1825,618,663,22,124,119,52,159,1318,1724,338,243,206,127,436,163,297,617,141,59,65,20,164,11,126,363,150,726,217,1282,1708,118,1055,60,603,852,170,1097,58,213,495,566,673,1607,994,539,1655

2021/input/2021/day8.txt

@@ -0,0 +1,200 @@
+bgafcde gfcd agc ebdgac adfceb bafeg efgca cgdfae cg ecadf | fabgced gc agc cdfg
+gbdacfe gcabfd cdb dcfba bfacg cgad fadeb feabcg cd gcbfed | bdagcef dcb cdag gbfca
+dgcbafe dbfca fbaed be cedb gefad dcfeab facdgb eba gbface | eb gadfcbe cfbad gfbeca
+ebc cb aedbf agcef badecg gaebfc bcgf adbcfge ceabf daecgf | cb bce efdab ecbaf
+fedbc cebad gfcbd fec gcdfab ecbfga dacgbfe gfed fe gefbdc | bfecag cef egdf fgde
+bafedc baefg dbfga daegcb gae egbcfa eg cefab fgce decbafg | abdgf cgfe cedgba befga
+dcba fagbed cgbfed dgfbeac da dag acbgde fcaeg becgd acgde | agd bacd dga gbecad
+ec aebgcfd fecd bagfec efagd edfgab cgdfea dgcab ecdga eac | ce ec ce gbacefd
+aegdbfc fe dacbf aefbgd aecgb cdfe ebadcf ecbfa cbfdga aef | dfce fe fcde afebdgc
+bgaf gcbad cagdfb gb dfbeca degfcb bfadc cfgeadb bdg agcde | fdegacb acbefgd bdg gafb
+gdecba dcae ec dbfeag bgead dgbce gec cgefab dcbgefa cdbfg | afdbgce agbfde abcgefd ec
+gacbefd fgbedc egafdc adf fcbae afedb ad bfeadg adbg dfgeb | ad degcfa ad dfbge
+fadebc baef eadfcg ebgdc eda cfgabd afbdc ea edcab cdgbefa | aefb ead ea ebaf
+badgecf caefd aebfdc fecbdg fadcg fed de ebad abgecf bceaf | ed gcfebd aebd gfdca
+bcdae aefcbg fgdea bf cdabegf adcebf fcbd fbead afb begadc | gbcafe faegbc fba eabdc
+bfcdeg ecd eabgc adeg ed dbaec bcfad ecabfg dbgcfea dbacge | de bdfcaeg ecgfbd bcdea
+deacf bf eagfdb gfecadb facbeg bfa cbdage abfce fbcg gecab | aebcf ecfagb abegfd bgeac
+eag dgbecf gdfae caed dfebgca ea ebcgfa dfbag gecfda dgcfe | ae ea deac fcdega
+edbga egdabc cgfdbe gabfe efcdgab gbdefa fb abdf fbg gecfa | cgaebd cbgdea acgfe begdca
+cgfedb egbdc agcfd cdagb eabgdf ab abce adb agcebfd dabegc | ba bda abd deagfb
+fc agfbce fdebg dgafeb ebfdc cbf cfedgba fdcg gcefdb eacdb | gbfaec fgcbed gbceafd bedagf
+bdcgefa acdfbe ed gbcea cfgbad ecbda edfcag afcbd ead bdef | dfbe de dea dea
+gfbeca gcefdb fegacd cgbda fbde ed bgedc begcf agdcefb ced | gbacd ced dec bcegfd
+dgbacf gfabec agd egdaf badcegf ad ecgaf defgb cade dfegca | cdae dga bgcaef ad
+dcf cfadb bcagd afebd fbgdec egfcbda fcea gfeabd fc ebdfac | gabdc ebfad aefc eacbdf
+cfgdba fcdab cgfbade adeb afdebc egcfdb de aedfc cfage edf | ed eadb dgebcf cefdabg
+bcae befga dgebfc fbagce cbefg agb fcedgab ba bdgacf dgfae | beca dcaegbf gab geafb
+dgafbec fedba cbega aebfdc eabfdg bdgfce edc fdac cd adceb | abedf dfeabg dc gdbefc
+adegfbc gbedcf cfabd gacedb abcfe fdbacg dgabc df dfga bfd | fdag dbf dafg fd
+dfbcag ebfcad ed agecdb bfacd egbfa badfe afbcegd aed cdef | afebd ecdf cfed eadfbgc
+fca dbcaf ebdcf fadbg cdbefa adec ac dacbgfe fbcdge cgefba | ac edca edac ca
+agdfce cedbfag agc dcbaeg gc bcdga bgdfa cfaebd ebdac cbge | ceadb becg ebadc gc
+aefbc aecdg efgcad cdebag bcg agfdbc bceag bdge bg fecdgab | bgecda bcdaeg gb caebf
+cfgebd acedf ag gbad gcfbad acg bgecfa bdfcg gbadecf cdfga | dgba dgcbf gac bgfdc
+cdgbafe cdgbe gd agde bcaged dfebc geacb cdg bgeacf gbdcfa | efgcba edag gecfdba cgd
+bcg bcaf cegdaf dfacg dgacb fgcebda bgdcaf efbcgd bc gadbe | gcb bcg caebdfg cfab
+eg cdgfae aecfd fgbaedc gbdfc facdeb cfegd ceag efg efdgab | fge acefbgd egf efg
+fcdg gefda cf edabc cedgfa cfa acefd cfebadg gdbafe bgecfa | fc fca cfabged fca
+ed bcadegf egdfb fgcdb edbafg facbeg abegf deba fadgec dge | eadb ged eadb adfegb
+bgedc cf cefadg ecbgdf gbfae cbdf fcg ecbgad abfgced becfg | bdcf dbceg fgcbde cdbeg
+cg gcaf defcag cdefg gdafe dgfabe gec dabegfc bcegad ebdcf | feadg degcf gcaf dcgefa
+fdeac gdcebf daecbg bgfec fdeagbc gca gecfa aefcbg fbag ag | ga decfagb ag agfb
+bc fbdc bagecdf gfdcab acdgb dcaeg dbgfa cgbaef ebgfda gbc | bdfc cb cfbd fbcd
+efagc bafegd abecg eab eb fgbeca gbedcfa bfec fcgade cgbad | abfgdce degacf fcaebg cdabfeg
+egbfcd afde ecgab fac fa edabcf cbdagfe afbec cfabgd fdebc | deaf feda cgbdfa fa
+gbafd defca ebcf eb cefbad dcebag dcgfae edfab deb bgedcfa | be deb gdbafce be
+afdgceb cf gbdeaf acdbfe abcef acf deafb fedgac cdbf cgeba | fac cfdb bdfcae fdcb
+cfdba ca afbgd eabc cda afbcdeg cfedb ecfgbd efcgad bcfeda | bfgad abec abce caeb
+cfebad debfacg acgfeb cab fedcb afcdb cdae febcdg ac dgbaf | bac ca faecbgd cgbfae
+eg dfcegb dge abedcgf facdg bafdgc degacf dafeg agec adebf | egd fegda fedbcag eagdf
+age gcbad feacb cgbdfae ge gfbe agebc fcadeg cbafde cgebaf | fagecdb bfeg baecg fceabd
+bfcdge fgcbead ebdgac ba dagbfe gab dabc bcegd gface cebga | cbda gbedc egcbafd gab
+dbcegfa fadceg fcage bcage gb bdagfc abdec gbfe bgafce bcg | ebfdagc ebfg ebgf egfb
+gcdefa bagf dgebf bdefc bgcafde dbefga edabg gfe gf dcgeba | fg efg agfb gebfd
+fabdc gdeabf dag gbace adcgb gd eagfcb gaedbc egdfabc egdc | adgbc bcadf gd cedfabg
+deagcf ce dfcaeb gfadceb bgade cde daegc cgdafb gadcf efcg | dbaecf fdecbga ce ecd
+dfcbag abceg db dgcefa dabec bcegdaf cdb bdef defac cfbdea | gdafec dcb febd bdef
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2021/input/2021/day9.txt

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2021/src/day1.rs

@@ -0,0 +1,140 @@
+//! --- Day 1: Sonar Sweep ---
+//! You're minding your own business on a ship at sea when the overboard alarm goes off! You rush to see if you can help. Apparently, one of the Elves tripped and accidentally sent the sleigh keys flying into the ocean!
+//!
+//! Before you know it, you're inside a submarine the Elves keep ready for situations like this. It's covered in Christmas lights (because of course it is), and it even has an experimental antenna that should be able to track the keys if you can boost its signal strength high enough; there's a little meter that indicates the antenna's signal strength by displaying 0-50 stars.
+//!
+//! Your instincts tell you that in order to save Christmas, you'll need to get all fifty stars by December 25th.
+//!
+//! Collect stars by solving puzzles. Two puzzles will be made available on each day in the Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants one star. Good luck!
+//!
+//! As the submarine drops below the surface of the ocean, it automatically performs a sonar sweep of the nearby sea floor. On a small screen, the sonar sweep report (your puzzle input) appears: each line is a measurement of the sea floor depth as the sweep looks further and further away from the submarine.
+//!
+//! For example, suppose you had the following report:
+//!
+//! 199
+//! 200
+//! 208
+//! 210
+//! 200
+//! 207
+//! 240
+//! 269
+//! 260
+//! 263
+//! This report indicates that, scanning outward from the submarine, the sonar sweep found depths of 199, 200, 208, 210, and so on.
+//!
+//! The first order of business is to figure out how quickly the depth increases, just so you know what you're dealing with - you never know if the keys will get carried into deeper water by an ocean current or a fish or something.
+//!
+//! To do this, count the number of times a depth measurement increases from the previous measurement. (There is no measurement before the first measurement.) In the example above, the changes are as follows:
+//!
+//! 199 (N/A - no previous measurement)
+//! 200 (increased)
+//! 208 (increased)
+//! 210 (increased)
+//! 200 (decreased)
+//! 207 (increased)
+//! 240 (increased)
+//! 269 (increased)
+//! 260 (decreased)
+//! 263 (increased)
+//! In this example, there are 7 measurements that are larger than the previous measurement.
+//!
+//! How many measurements are larger than the previous measurement?
+//! --- Part Two ---
+//! Considering every single measurement isn't as useful as you expected: there's just too much noise in the data.
+//!
+//! Instead, consider sums of a three-measurement sliding window. Again considering the above example:
+//!
+//! 199  A
+//! 200  A B
+//! 208  A B C
+//! 210    B C D
+//! 200  E   C D
+//! 207  E F   D
+//! 240  E F G
+//! 269    F G H
+//! 260      G H
+//! 263        H
+//! Start by comparing the first and second three-measurement windows. The measurements in the first window are marked A (199, 200, 208); their sum is 199 + 200 + 208 = 607. The second window is marked B (200, 208, 210); its sum is 618. The sum of measurements in the second window is larger than the sum of the first, so this first comparison increased.
+//!
+//! Your goal now is to count the number of times the sum of measurements in this sliding window increases from the previous sum. So, compare A with B, then compare B with C, then C with D, and so on. Stop when there aren't enough measurements left to create a new three-measurement sum.
+//!
+//! In the above example, the sum of each three-measurement window is as follows:
+//!
+//! A: 607 (N/A - no previous sum)
+//! B: 618 (increased)
+//! C: 618 (no change)
+//! D: 617 (decreased)
+//! E: 647 (increased)
+//! F: 716 (increased)
+//! G: 769 (increased)
+//! H: 792 (increased)
+//! In this example, there are 5 sums that are larger than the previous sum.
+//!
+//! Consider sums of a three-measurement sliding window. How many sums are larger than the previous sum?
+
+use anyhow::Result;
+use aoc_runner_derive::{aoc, aoc_generator};
+
+/// Reads text file containing one integer per line, and parses them into `Vec<u32>`.  
+#[aoc_generator(day1)]
+fn parse(input: &str) -> Result<Vec<u32>> {
+    input.split('\n').map(|s| Ok(s.parse()?)).collect()
+}
+
+#[aoc(day1, part1)]
+fn part1(depths: &[u32]) -> Result<u32> {
+    Ok(depths
+        .windows(2)
+        .map(|s| if s[0] < s[1] { 1 } else { 0 })
+        .sum())
+}
+
+#[aoc(day1, part2)]
+fn part2(depths: &[u32]) -> Result<u32> {
+    let sums: Vec<u32> = depths.windows(3).map(|s| s.iter().sum()).collect();
+    Ok(sums
+        .windows(2)
+        .map(|s| if s[0] < s[1] { 1 } else { 0 })
+        .sum())
+}
+
+#[test]
+fn test_part1() -> Result<()> {
+    assert_eq!(
+        part1(&parse(
+            r#"199
+200
+208
+210
+200
+207
+240
+269
+260
+263"#
+        )?)?,
+        7
+    );
+    Ok(())
+}
+
+#[test]
+fn test_part2() -> Result<()> {
+    assert_eq!(
+        part2(&parse(
+            r#"199
+200
+208
+210
+200
+207
+240
+269
+260
+263"#
+        )?)?,
+        5
+    );
+    Ok(())
+}

2021/src/day10.rs

@@ -0,0 +1,265 @@
+//! --- Day 10: Syntax Scoring ---
+//! You ask the submarine to determine the best route out of the deep-sea cave, but it only replies:
+//!
+//! Syntax error in navigation subsystem on line: all of them
+//! All of them?! The damage is worse than you thought. You bring up a copy of the navigation subsystem (your puzzle input).
+//!
+//! The navigation subsystem syntax is made of several lines containing chunks. There are one or more chunks on each line, and chunks contain zero or more other chunks. Adjacent chunks are not separated by any delimiter; if one chunk stops, the next chunk (if any) can immediately start. Every chunk must open and close with one of four legal pairs of matching characters:
+//!
+//! If a chunk opens with (, it must close with ).
+//! If a chunk opens with [, it must close with ].
+//! If a chunk opens with {, it must close with }.
+//! If a chunk opens with <, it must close with >.
+//! So, () is a legal chunk that contains no other chunks, as is []. More complex but valid chunks include ([]), {()()()}, <([{}])>, [<>({}){}[([])<>]], and even (((((((((()))))))))).
+//!
+//! Some lines are incomplete, but others are corrupted. Find and discard the corrupted lines first.
+//!
+//! A corrupted line is one where a chunk closes with the wrong character - that is, where the characters it opens and closes with do not form one of the four legal pairs listed above.
+//!
+//! Examples of corrupted chunks include (], {()()()>, (((()))}, and <([]){()}[{}]). Such a chunk can appear anywhere within a line, and its presence causes the whole line to be considered corrupted.
+//!
+//! For example, consider the following navigation subsystem:
+//!
+//! [({(<(())[]>[[{[]{<()<>>
+//! [(()[<>])]({[<{<<[]>>(
+//! {([(<{}[<>[]}>{[]{[(<()>
+//! (((({<>}<{<{<>}{[]{[]{}
+//! [[<[([]))<([[{}[[()]]]
+//! [{[{({}]{}}([{[{{{}}([]
+//! {<[[]]>}<{[{[{[]{()[[[]
+//! [<(<(<(<{}))><([]([]()
+//! <{([([[(<>()){}]>(<<{{
+//! <{([{{}}[<[[[<>{}]]]>[]]
+//! Some of the lines aren't corrupted, just incomplete; you can ignore these lines for now. The remaining five lines are corrupted:
+//!
+//! {([(<{}[<>[]}>{[]{[(<()> - Expected ], but found } instead.
+//! [[<[([]))<([[{}[[()]]] - Expected ], but found ) instead.
+//! [{[{({}]{}}([{[{{{}}([] - Expected ), but found ] instead.
+//! [<(<(<(<{}))><([]([]() - Expected >, but found ) instead.
+//! <{([([[(<>()){}]>(<<{{ - Expected ], but found > instead.
+//! Stop at the first incorrect closing character on each corrupted line.
+//!
+//! Did you know that syntax checkers actually have contests to see who can get the high score for syntax errors in a file? It's true! To calculate the syntax error score for a line, take the first illegal character on the line and look it up in the following table:
+//!
+//! ): 3 points.
+//! ]: 57 points.
+//! }: 1197 points.
+//! >: 25137 points.
+//! In the above example, an illegal ) was found twice (2*3 = 6 points), an illegal ] was found once (57 points), an illegal } was found once (1197 points), and an illegal > was found once (25137 points). So, the total syntax error score for this file is 6+57+1197+25137 = 26397 points!
+//!
+//! Find the first illegal character in each corrupted line of the navigation subsystem. What is the total syntax error score for those errors?
+//!
+//! --- Part Two ---
+//! Now, discard the corrupted lines. The remaining lines are incomplete.
+//!
+//! Incomplete lines don't have any incorrect characters - instead, they're missing some closing characters at the end of the line. To repair the navigation subsystem, you just need to figure out the sequence of closing characters that complete all open chunks in the line.
+//!
+//! You can only use closing characters (), ], }, or >), and you must add them in the correct order so that only legal pairs are formed and all chunks end up closed.
+//!
+//! In the example above, there are five incomplete lines:
+//!
+//!
+//! [({(<(())[]>[[{[]{<()<>> - Complete by adding }}]])})].
+//! [(()[<>])]({[<{<<[]>>( - Complete by adding )}>]}).
+//! (((({<>}<{<{<>}{[]{[]{} - Complete by adding }}>}>)))).
+//! {<[[]]>}<{[{[{[]{()[[[] - Complete by adding ]]}}]}]}>.
+//! <{([{{}}[<[[[<>{}]]]>[]] - Complete by adding ])}>.
+//! Did you know that autocomplete tools also have contests? It's true! The score is determined by considering the completion string character-by-character. Start with a total score of 0. Then, for each character, multiply the total score by 5 and then increase the total score by the point value given for the character in the following table:
+//!
+//! ): 1 point.
+//! ]: 2 points.
+//! }: 3 points.
+//! >: 4 points.
+//! So, the last completion string above - ])}> - would be scored as follows:
+//!
+//! Start with a total score of 0.
+//! Multiply the total score by 5 to get 0, then add the value of ] (2) to get a new total score of 2.
+//! Multiply the total score by 5 to get 10, then add the value of ) (1) to get a new total score of 11.
+//! Multiply the total score by 5 to get 55, then add the value of } (3) to get a new total score of 58.
+//! Multiply the total score by 5 to get 290, then add the value of > (4) to get a new total score of 294.
+//! The five lines' completion strings have total scores as follows:
+//!
+//! }}]])})] - 288957 total points.
+//! )}>]}) - 5566 total points.
+//! }}>}>)))) - 1480781 total points.
+//! ]]}}]}]}> - 995444 total points.
+//! ])}> - 294 total points.
+//! Autocomplete tools are an odd bunch: the winner is found by sorting all of the scores and then taking the middle score. (There will always be an odd number of scores to consider.) In this example, the middle score is 288957 because there are the same number of scores smaller and larger than it.
+//!
+//! Find the completion string for each incomplete line, score the completion strings, and sort the scores. What is the middle score?
+
+use std::collections::HashMap;
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+fn corrupt_score(b: u8) -> u64 {
+    match b {
+        b')' => 3,
+        b']' => 57,
+        b'}' => 1197,
+        b'>' => 25137,
+        _ => panic!("unknown illegal character '{}'", b),
+    }
+}
+
+fn corrupted(line: &str) -> Option<u8> {
+    let pairs: HashMap<_, _> = vec![
+        (b'(', b')'),
+        (b'{', b'}'),
+        (b'[', b']'),
+        (b'<', b'>'),
+        (b')', b'('),
+        (b'}', b'{'),
+        (b']', b'['),
+        (b'>', b'<'),
+    ]
+    .into_iter()
+    .collect();
+    let mut stack = Vec::new();
+    for b in line.as_bytes() {
+        match b {
+            b'[' | b'(' | b'{' | b'<' => stack.push(b),
+            b']' | b')' | b'}' | b'>' => {
+                let c = pairs[stack.pop().unwrap()];
+                if c != *b {
+                    return Some(*b);
+                }
+            }
+            _ => panic!("Unexpected delimiter '{}'", b),
+        }
+    }
+    None
+}
+fn incomplete_score(bs: &[u8]) -> u64 {
+    bs.iter().fold(0, |acc, b| {
+        acc * 5
+            + match b {
+                b')' => 1,
+                b']' => 2,
+                b'}' => 3,
+                b'>' => 4,
+                _ => panic!("unknown illegal character '{}'", b),
+            }
+    })
+}
+
+fn incompleted(line: &str) -> Vec<u8> {
+    let pairs: HashMap<_, _> = vec![
+        (b'(', b')'),
+        (b'{', b'}'),
+        (b'[', b']'),
+        (b'<', b'>'),
+        (b')', b'('),
+        (b'}', b'{'),
+        (b']', b'['),
+        (b'>', b'<'),
+    ]
+    .into_iter()
+    .collect();
+    let mut stack = Vec::new();
+    for b in line.as_bytes() {
+        match b {
+            b'[' | b'(' | b'{' | b'<' => stack.push(b),
+            b']' | b')' | b'}' | b'>' => {
+                stack.pop();
+            }
+            _ => panic!("Unexpected delimiter '{}'", b),
+        }
+    }
+    stack.iter().rev().map(|b| pairs[b]).collect()
+}
+
+#[aoc(day10, part1)]
+fn part1(input: &str) -> Result<u64> {
+    Ok(input.lines().filter_map(corrupted).map(corrupt_score).sum())
+}
+
+#[aoc(day10, part2)]
+fn part2(input: &str) -> Result<u64> {
+    let mut scores: Vec<_> = input
+        .lines()
+        .filter(|l| corrupted(l).is_none())
+        .filter_map(|l| {
+            let r = incompleted(l);
+            if r.is_empty() {
+                None
+            } else {
+                Some(r)
+            }
+        })
+        .map(|bs| incomplete_score(&bs))
+        .collect();
+    scores.sort_unstable();
+    Ok(scores[scores.len() / 2])
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
+    "#
+        .trim();
+        assert_eq!(part1(input)?, 26397);
+        Ok(())
+    }
+
+    #[test]
+    fn test_incompleted() {
+        assert_eq!(
+            incompleted("[({(<(())[]>[[{[]{<()<>>"),
+            b"}}]])})]".to_vec()
+        );
+        assert_eq!(incompleted("[(()[<>])]({[<{<<[]>>("), b")}>]})".to_vec());
+        assert_eq!(
+            incompleted("(((({<>}<{<{<>}{[]{[]{}"),
+            b"}}>}>))))".to_vec()
+        );
+        assert_eq!(
+            incompleted("{<[[]]>}<{[{[{[]{()[[[]"),
+            b"]]}}]}]}>".to_vec()
+        );
+        assert_eq!(incompleted("<{([{{}}[<[[[<>{}]]]>[]]"), b"])}>".to_vec());
+    }
+
+    #[test]
+    fn test_incomplete_score() {
+        assert_eq!(incomplete_score(&b"}}]])})]".to_vec()), 288957);
+        assert_eq!(incomplete_score(&b")}>]})".to_vec()), 5566);
+        assert_eq!(incomplete_score(&b"}}>}>))))".to_vec()), 1480781);
+        assert_eq!(incomplete_score(&b"]]}}]}]}>".to_vec()), 995444);
+        assert_eq!(incomplete_score(&b"])}>".to_vec()), 294);
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 288957);
+        Ok(())
+    }
+}

2021/src/day11.rs

@@ -0,0 +1,444 @@
+use std::{
+    collections::HashSet,
+    convert::Infallible,
+    fmt::{Debug, Error, Formatter},
+    ops::{Index, IndexMut},
+    str::FromStr,
+};
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+struct Image {
+    width: usize,
+    height: usize,
+    pixels: Vec<u8>,
+    flashes: usize,
+}
+
+impl Image {
+    fn kernel3x3<F>(&mut self, (x, y): (usize, usize), func: F)
+    where
+        F: Fn(u8) -> u8,
+    {
+        if x > 0 {
+            self[(x - 1, y)] = func(self[(x - 1, y)]);
+            if y > 0 {
+                self[(x - 1, y - 1)] = func(self[(x - 1, y - 1)]);
+            }
+            if y < self.height - 1 {
+                self[(x - 1, y + 1)] = func(self[(x - 1, y + 1)]);
+            }
+        }
+
+        if y > 0 {
+            self[(x, y - 1)] = func(self[(x, y - 1)]);
+        }
+        if y < self.height - 1 {
+            self[(x, y + 1)] = func(self[(x, y + 1)]);
+        }
+
+        if x < self.width - 1 {
+            self[(x + 1, y)] = func(self[(x + 1, y)]);
+            if y > 0 {
+                self[(x + 1, y - 1)] = func(self[(x + 1, y - 1)]);
+            }
+            if y < self.height - 1 {
+                self[(x + 1, y + 1)] = func(self[(x + 1, y + 1)]);
+            }
+        }
+    }
+
+    fn step(&mut self) {
+        self.pixels.iter_mut().for_each(|p| *p += 1);
+        let mut flashed: HashSet<(usize, usize)> = HashSet::new();
+        loop {
+            let mut flashes = 0;
+            // Apply the effect of a flash on neighbors
+            let mut need_to_flash = Vec::new();
+            for y in 0..self.height {
+                for x in 0..self.width {
+                    if self[(x, y)] > 9 && !flashed.contains(&(x, y)) {
+                        need_to_flash.push((x, y));
+                    }
+                }
+            }
+            for (x, y) in need_to_flash {
+                self.kernel3x3((x, y), |x| x + 1);
+                flashed.insert((x, y));
+                flashes += 1;
+            }
+
+            if flashes == 0 {
+                break;
+            }
+            self.flashes += flashes;
+        }
+
+        self.pixels.iter_mut().for_each(|p| {
+            if *p > 9 {
+                *p = 0
+            }
+        });
+    }
+
+    fn sync(&self) -> bool {
+        let sentinel = self[(0, 0)];
+        for p in &self.pixels {
+            if *p != sentinel {
+                return false;
+            }
+        }
+        true
+    }
+}
+
+impl PartialEq for Image {
+    fn eq(&self, other: &Self) -> bool {
+        self.width == other.width && self.height == other.height && self.pixels == other.pixels
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                write!(f, "{:3}", self[(x, y)])?;
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl FromStr for Image {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let rows: Vec<_> = s.lines().collect();
+        let width = rows[0].len();
+        let height = rows.len();
+        let pixels = rows
+            .iter()
+            .flat_map(|row| row.as_bytes().iter().map(|b| b - b'0'))
+            .collect();
+
+        Ok(Image {
+            width,
+            height,
+            pixels,
+            flashes: 0,
+        })
+    }
+}
+
+impl Index<(usize, usize)> for Image {
+    type Output = u8;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+impl IndexMut<(usize, usize)> for Image {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        &mut self.pixels[x + y * self.width]
+    }
+}
+
+#[aoc(day11, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let mut im: Image = input.parse()?;
+    for _ in 0..100 {
+        im.step();
+    }
+    if im.width > 11 {
+        assert!(im.flashes > 1355);
+    }
+    Ok(im.flashes)
+}
+
+#[aoc(day11, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let mut im: Image = input.parse()?;
+    for i in 1.. {
+        im.step();
+        if im.sync() {
+            return Ok(i);
+        }
+    }
+    unreachable!();
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use pretty_assertions::assert_eq;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
+"#
+        .trim();
+        assert_eq!(part1(input)?, 1656);
+        Ok(())
+    }
+
+    #[test]
+    fn test_step() -> Result<()> {
+        let mut im: Image = r#"
+11111
+19991
+19191
+19991
+11111
+"#
+        .trim()
+        .parse()?;
+        let step1: Image = r#"
+34543
+40004
+50005
+40004
+34543
+"#
+        .trim()
+        .parse()?;
+
+        let step2: Image = r#"
+45654
+51115
+61116
+51115
+45654
+"#
+        .trim()
+        .parse()?;
+
+        im.step();
+        assert_eq!(im, step1);
+        im.step();
+        assert_eq!(im, step2);
+        Ok(())
+    }
+
+    #[test]
+    fn test_many_iterations() -> Result<()> {
+        let mut im: Image = r#"
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
+"#
+        .trim()
+        .parse()?;
+
+        let step1: Image = r#"
+6594254334
+3856965822
+6375667284
+7252447257
+7468496589
+5278635756
+3287952832
+7993992245
+5957959665
+6394862637
+"#
+        .trim()
+        .parse()?;
+
+        let step2: Image = r#"
+8807476555
+5089087054
+8597889608
+8485769600
+8700908800
+6600088989
+6800005943
+0000007456
+9000000876
+8700006848
+"#
+        .trim()
+        .parse()?;
+
+        let step3: Image = r#"
+0050900866
+8500800575
+9900000039
+9700000041
+9935080063
+7712300000
+7911250009
+2211130000
+0421125000
+0021119000
+"#
+        .trim()
+        .parse()?;
+
+        let step4: Image = r#"
+2263031977
+0923031697
+0032221150
+0041111163
+0076191174
+0053411122
+0042361120
+5532241122
+1532247211
+1132230211
+"#
+        .trim()
+        .parse()?;
+
+        let step5: Image = r#"
+4484144000
+2044144000
+2253333493
+1152333274
+1187303285
+1164633233
+1153472231
+6643352233
+2643358322
+2243341322
+"#
+        .trim()
+        .parse()?;
+
+        let step6: Image = r#"
+5595255111
+3155255222
+3364444605
+2263444496
+2298414396
+2275744344
+2264583342
+7754463344
+3754469433
+3354452433
+"#
+        .trim()
+        .parse()?;
+
+        let step7: Image = r#"
+6707366222
+4377366333
+4475555827
+3496655709
+3500625609
+3509955566
+3486694453
+8865585555
+4865580644
+4465574644
+"#
+        .trim()
+        .parse()?;
+
+        let step8: Image = r#"
+7818477333
+5488477444
+5697666949
+4608766830
+4734946730
+4740097688
+6900007564
+0000009666
+8000004755
+6800007755
+"#
+        .trim()
+        .parse()?;
+
+        let step9: Image = r#"
+9060000644
+7800000976
+6900000080
+5840000082
+5858000093
+6962400000
+8021250009
+2221130009
+9111128097
+7911119976
+"#
+        .trim()
+        .parse()?;
+
+        let step10: Image = r#"
+0481112976
+0031112009
+0041112504
+0081111406
+0099111306
+0093511233
+0442361130
+5532252350
+0532250600
+0032240000
+"#
+        .trim()
+        .parse()?;
+        let step10_flashes = 204;
+
+        im.step();
+        assert_eq!(im, step1, "step1");
+        im.step();
+        assert_eq!(im, step2, "step2");
+        im.step();
+        assert_eq!(im, step3, "step3");
+        im.step();
+        assert_eq!(im, step4, "step4");
+        im.step();
+        assert_eq!(im, step5, "step5");
+        im.step();
+        assert_eq!(im, step6, "step6");
+        im.step();
+        assert_eq!(im, step7, "step7");
+        im.step();
+        assert_eq!(im, step8, "step8");
+        im.step();
+        assert_eq!(im, step9, "step9");
+        im.step();
+        assert_eq!(im, step10, "step10");
+        assert_eq!(im.flashes, step10_flashes, "step10 wrong flashes");
+        Ok(())
+    }
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 195);
+        Ok(())
+    }
+}

2021/src/day12.rs

@@ -0,0 +1,140 @@
+use std::collections::HashMap;
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+fn search(node: &str, nodes: &HashMap<&str, Vec<&str>>, path: String, paths: &mut Vec<String>) {
+    if node == "end" {
+        paths.push(path);
+        return;
+    }
+    for neighbor in &nodes[node] {
+        // If lowercase.
+        if neighbor.as_bytes()[0] & 0x20 != 0 && path.contains(neighbor) {
+            continue;
+        }
+        search(neighbor, nodes, format!("{},{}", path, neighbor), paths);
+    }
+}
+
+fn paths(nodes: &HashMap<&str, Vec<&str>>) -> usize {
+    let mut paths = Vec::new();
+    search("start", nodes, "start".to_string(), &mut paths);
+    paths.len()
+}
+
+#[aoc(day12, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let mut nodes = HashMap::new();
+    input.lines().for_each(|p| {
+        let (n1, n2) = p.split_once('-').expect("missing dash");
+        nodes.entry(n1).or_insert_with(Vec::new).push(n2);
+        nodes.entry(n2).or_insert_with(Vec::new).push(n1);
+    });
+    Ok(paths(&nodes))
+}
+
+fn search2<'a>(
+    node: &str,
+    nodes: &HashMap<&'a str, Vec<&'a str>>,
+    path: &[&'a str],
+    paths: &mut Vec<Vec<&'a str>>,
+    double: &'a str,
+    smalls: &[&'a str],
+) {
+    if node == "end" {
+        paths.push(path.to_vec());
+        return;
+    }
+    for neighbor in &nodes[node] {
+        // If lowercase.
+        if neighbor.as_bytes()[0] & 0x20 != 0 {
+            if neighbor == &double {
+                // Allow two passes for this small node.
+                if path.iter().filter(|p| p == &neighbor).count() >= 2 {
+                    continue;
+                }
+            } else {
+                // Only allow one pass for this small node.
+                if path.contains(neighbor) {
+                    continue;
+                }
+            }
+        }
+        let mut child_path = path.to_vec();
+        child_path.push(neighbor);
+        search2(neighbor, nodes, &child_path, paths, double, smalls);
+    }
+}
+fn paths2(nodes: &HashMap<&str, Vec<&str>>) -> usize {
+    let mut paths = Vec::new();
+    let smalls: Vec<_> = nodes
+        .keys()
+        .filter(|n| n.as_bytes()[0] & 0x20 != 0)
+        .filter(|&n| n != &"start" && n != &"end")
+        .cloned()
+        .collect();
+
+    for double in &smalls {
+        search2(
+            "start",
+            nodes,
+            &["start"],
+            &mut paths,
+            double,
+            smalls.as_slice(),
+        );
+    }
+    paths.sort();
+    paths.dedup();
+    paths.len()
+}
+
+#[aoc(day12, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let mut nodes = HashMap::new();
+    input.lines().for_each(|p| {
+        let (n1, n2) = p.split_once('-').expect("missing dash");
+        nodes.entry(n1).or_insert_with(Vec::new).push(n2);
+        nodes.entry(n2).or_insert_with(Vec::new).push(n1);
+    });
+    Ok(paths2(&nodes))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+start-A
+start-b
+A-c
+A-b
+b-d
+A-end
+b-end
+"#
+        .trim();
+
+        assert_eq!(part1(input)?, 10);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+start-A
+start-b
+A-c
+A-b
+b-d
+A-end
+b-end
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 36);
+        Ok(())
+    }
+}

2021/src/day13.rs

@@ -0,0 +1,258 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+struct Image {
+    width: usize,
+    height: usize,
+    pixels: Vec<u8>,
+}
+
+impl Image {
+    fn new(width: usize, height: usize) -> Image {
+        let pixels = vec![0; width * height];
+        Image {
+            width,
+            height,
+            pixels,
+        }
+    }
+    fn new_with_pts(width: usize, height: usize, pts: &[(usize, usize)]) -> Image {
+        let pixels = vec![0; width * height];
+        let mut im = Image {
+            width,
+            height,
+            pixels,
+        };
+        dbg!(&width, &height);
+        pts.iter().for_each(|xy| im[*xy] = 1);
+        im
+    }
+    fn fold_y(&self, y_axis: usize) -> Image {
+        println!("fold_y @ {}", y_axis);
+        let mut im = Image::new(self.width, y_axis);
+        let odd = self.height % 2;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                //dbg!( self.width, self.height, x, y, y_axis, (y % y_axis), self.pixels.len(), im.pixels.len());
+                if self[(x, y)] > 0 {
+                    if y > y_axis {
+                        im[(x, self.height - y - odd)] = self[(x, y)];
+                    } else {
+                        im[(x, y)] = self[(x, y)];
+                    }
+                }
+            }
+        }
+        im
+    }
+    fn fold_x(&self, x_axis: usize) -> Image {
+        let odd = self.width % 2;
+        println!("fold_x @ {}", x_axis);
+        for y in 0..self.height {
+            assert_eq!(
+                self[(x_axis, y)],
+                0,
+                "w,h {},{} x_axis {}",
+                self.width,
+                self.height,
+                x_axis,
+            );
+        }
+        let mut im = Image::new(x_axis, self.height);
+        for y in 0..self.height {
+            for x in 0..self.width {
+                if self[(x, y)] > 0 {
+                    if x > x_axis {
+                        im[(self.width - x - odd, y)] = self[(x, y)];
+                    } else {
+                        im[(x, y)] = self[(x, y)];
+                    }
+                }
+            }
+        }
+        im
+    }
+
+    fn count(&self) -> usize {
+        self.pixels.iter().filter(|&n| *n != 0).count()
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                if self[(x, y)] > 0 {
+                    write!(f, "#")?;
+                } else {
+                    write!(f, ".")?;
+                }
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl Index<(usize, usize)> for Image {
+    type Output = u8;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+impl IndexMut<(usize, usize)> for Image {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        //dbg!(self.width, self.height, x, y, self.pixels.len());
+        &mut self.pixels[x + y * self.width]
+    }
+}
+
+#[aoc(day13, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let (pts, folds) = input.split_once("\n\n").unwrap();
+    let pts: Vec<(usize, usize)> = pts
+        .lines()
+        .map(|l| l.split_once(',').unwrap())
+        .map(|(x, y)| (x.parse().unwrap(), y.parse().unwrap()))
+        .collect();
+    let folds: Vec<_> = folds
+        .lines()
+        .map(|l| l.split(' ').nth(2).unwrap().split_once('=').unwrap())
+        .map(|(axis, idx)| (axis, idx.parse().unwrap()))
+        .collect();
+    let (maxx, maxy) = pts
+        .iter()
+        .fold((0, 0), |(maxx, maxy), (x, y)| (maxx.max(*x), maxy.max(*y)));
+    let mut im = Image::new_with_pts(maxx + 1, maxy + 1, &pts);
+    //dbg!(&im);
+
+    for (axis, idx) in folds.iter().take(1) {
+        im = if *axis == "y" {
+            im.fold_y(*idx)
+        } else {
+            im.fold_x(*idx)
+        };
+    }
+    //assert!(im.count() < 896);
+    dbg!(&im);
+    Ok(im.count())
+}
+
+#[aoc(day13, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let (pts, folds) = input.split_once("\n\n").unwrap();
+    let pts: Vec<(usize, usize)> = pts
+        .lines()
+        .map(|l| l.split_once(',').unwrap())
+        .map(|(x, y)| (x.parse().unwrap(), y.parse().unwrap()))
+        .collect();
+    let folds: Vec<_> = folds
+        .lines()
+        .map(|l| l.split(' ').nth(2).unwrap().split_once('=').unwrap())
+        .map(|(axis, idx)| (axis, idx.parse().unwrap()))
+        .collect();
+    let (maxx, maxy) = pts
+        .iter()
+        .fold((0, 0), |(maxx, maxy), (x, y)| (maxx.max(*x), maxy.max(*y)));
+    let mut im = Image::new_with_pts(maxx + 1, maxy + 1, &pts);
+    //dbg!(&im);
+
+    for (axis, idx) in folds.iter() {
+        im = if *axis == "y" {
+            im.fold_y(*idx)
+        } else {
+            im.fold_x(*idx)
+        };
+    }
+    dbg!(&im);
+    Ok(im.count())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5
+
+"#
+        .trim();
+        assert_eq!(part1(input)?, 17);
+        Ok(())
+    }
+
+    #[test]
+    fn test_fold_x() -> Result<()> {
+        let input = r#"
+0,0
+1,1
+3,3
+4,4
+
+fold along x=2
+fold along y=2
+
+"#
+        .trim();
+        let (pts, folds) = input.split_once("\n\n").unwrap();
+        let pts: Vec<(usize, usize)> = pts
+            .lines()
+            .map(|l| l.split_once(',').unwrap())
+            .map(|(x, y)| (x.parse().unwrap(), y.parse().unwrap()))
+            .collect();
+        let folds: Vec<_> = folds
+            .lines()
+            .map(|l| l.split(' ').nth(2).unwrap().split_once('=').unwrap())
+            .map(|(axis, idx)| (axis, idx.parse().unwrap()))
+            .collect();
+        let (maxx, maxy) = pts
+            .iter()
+            .fold((0, 0), |(maxx, maxy), (x, y)| (maxx.max(*x), maxy.max(*y)));
+        let mut im = Image::new_with_pts(maxx + 1, maxy + 1, &pts);
+        dbg!(&im);
+        for (axis, idx) in folds.iter() {
+            im = if *axis == "y" {
+                im.fold_y(*idx)
+            } else {
+                im.fold_x(*idx)
+            };
+        }
+        dbg!(&im);
+        //assert_eq!(im.count(), 17);
+        Ok(())
+    }
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+    let input = r#"
+    "#
+    .trim();
+    assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

2021/src/day14.rs

@@ -0,0 +1,298 @@
+use std::collections::HashMap;
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+struct TupleWindow<I, T>
+where
+    I: Iterator<Item = T>,
+{
+    iter: I,
+    prev: Option<T>,
+    next: Option<T>,
+}
+
+impl<I, T> TupleWindow<I, T>
+where
+    I: Iterator<Item = T>,
+{
+    fn new(iter: I, rules: &HashMap<&[u8], u8>) -> Self {
+        TupleWindow {
+            iter,
+            prev: None,
+            next: None,
+        }
+    }
+}
+
+impl<I, T> Iterator for TupleWindow<I, T>
+where
+    I: Iterator<Item = T>,
+{
+    type Item = T;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.prev.is_none() {
+            self.prev = self.iter.next();
+        }
+        /*
+           template.next() {
+           template.flat_map(|y|
+           let z = rules[xy];
+           res[i * 2] = xy[0];
+           res[i * 2 + 1] = z;
+           res[i * 2 + 2] = xy[1];
+           });
+        //dbg!(String::from_utf8_lossy(&res));
+        res
+        */
+
+        if let Some(next) = self.iter.next() {
+            let prev = self.prev.take();
+            self.prev = Some(next);
+            return prev;
+        }
+        None
+    }
+}
+
+fn expand_it<'a, I: 'a + Iterator<Item = &'a u8>>(
+    template: I,
+    rules: &HashMap<&[u8], u8>,
+) -> impl Iterator<Item = &'a u8> {
+    TupleWindow::new(template, rules)
+}
+
+fn forty_steps<'a, I: 'a + Iterator<Item = &'a u8>>(it: I, rules: &HashMap<&[u8], u8>) -> usize {
+    return 0;
+    //let it = (1..40).fold(it, |acc, _| expand_it(acc, &rules));
+    expand_it(
+        expand_it(
+            expand_it(
+                expand_it(
+                    expand_it(
+                        expand_it(
+                            expand_it(
+                                expand_it(
+                                    expand_it(
+                                        expand_it(
+                                            expand_it(
+                                                expand_it(
+                                                    expand_it(
+                                                        expand_it(
+                                                            expand_it(
+                                                                expand_it(
+                                                                    expand_it(
+                                                                        expand_it(
+                                                                            expand_it(
+                                                                                expand_it(
+                                                                                    expand_it(
+                                                                                        expand_it(
+                                                                                            expand_it(
+                                                                                                expand_it(
+                                                                                                    expand_it(
+                                                                                                        expand_it(
+                                                                                                            expand_it(
+                                                                                                                expand_it(
+                                                                                                                    expand_it(
+                                                                                                                        expand_it(
+                                                                                                                            expand_it(
+                                                                                                                                expand_it(
+                                                                                                                                    expand_it(
+                                                                                                                                        expand_it(
+                                                                                                                                            expand_it(
+                                                                                                                                                expand_it(
+                                                                                                                                                    expand_it(
+                                                                                                                                                        expand_it(
+    expand_it(
+        expand_it(it, &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+                                                                                                                                                                    &rules),
+        &rules,
+    )
+    .count()
+}
+
+fn expand(template: &[u8], rules: &HashMap<&[u8], u8>) -> Vec<u8> {
+    let mut res = vec![0u8; template.len() * 2 - 1];
+    template.windows(2).enumerate().for_each(|(i, xy)| {
+        let z = rules[xy];
+        res[i * 2] = xy[0];
+        res[i * 2 + 1] = z;
+        res[i * 2 + 2] = xy[1];
+    });
+    //dbg!(String::from_utf8_lossy(&res));
+    res
+}
+
+fn count(template: &[u8]) -> (usize, usize) {
+    let m = template
+        .iter()
+        .fold(HashMap::<u8, usize>::new(), |mut m, v| {
+            *m.entry(*v).or_insert(0) += 1;
+            m
+        });
+    let mut keys: Vec<_> = m.keys().collect();
+    keys.sort_unstable();
+    let mut s = "".to_string();
+    for k in keys {
+        s.push_str(&format!("{}: {} ", String::from_utf8_lossy(&[*k]), m[k]));
+    }
+    m.values()
+        .fold((usize::MAX, 0), |(min, max), v| (min.min(*v), max.max(*v)))
+}
+
+#[aoc(day14, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let (template, rules) = input.split_once("\n\n").unwrap();
+    let rules: HashMap<&[u8], u8> = rules
+        .lines()
+        .map(|l| {
+            let (pair, insert) = l.split_once(" -> ").unwrap();
+            (pair.as_bytes(), insert.as_bytes()[0])
+        })
+        .collect();
+    let mut template = template.as_bytes().to_vec();
+    for i in 1..11 {
+        template = expand(&template, &rules);
+        let s = String::from_utf8_lossy(&template);
+        count(&template);
+    }
+    let (min, max) = count(&template);
+    Ok(max - min)
+}
+
+// TODO
+//#[aoc(day14, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let (template, rules) = input.split_once("\n\n").unwrap();
+    let rules: HashMap<&[u8], u8> = rules
+        .lines()
+        .map(|l| {
+            let (pair, insert) = l.split_once(" -> ").unwrap();
+            (pair.as_bytes(), insert.as_bytes()[0])
+        })
+        .collect();
+    let cnt = forty_steps(template.as_bytes().iter(), &rules);
+    dbg!(cnt);
+    //println!("After step {}: {}", i, String::from_utf8_lossy(&template));
+    //let (min, max) = count(template);
+    //Ok(max - min)
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
+            "#
+        .trim();
+        assert_eq!(part1(input)?, 1588);
+        Ok(())
+    }
+
+    // TODO
+    //#[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
+            "#
+        .trim();
+        assert_eq!(part2(input)?, 2188189693529);
+        Ok(())
+    }
+}
+
+// BB -> N   BN NB    BB NB NB BB
+// BC -> B   BB BC    BN NB BB BC
+// BH -> H   BH HH    BH HH HN NH
+// BN -> B   BB NB    BN NB NB BB
+// CB -> H   CH HB    \
+// CC -> N   CN NC
+// CH -> B   CB BH
+// CN -> C   CC CN
+// HB -> C   HC CB
+// HC -> B   HB BC
+// HH -> N   HN NH
+// HN -> C   HC CN
+// NB -> B   NB BB
+// NC -> B   NC BC
+// NH -> C   NC CH
+// NN -> C   NC CN
+//
+//
+//

2021/src/day15.rs

@@ -0,0 +1,272 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+struct Image {
+    width: usize,
+    height: usize,
+    pixels: Vec<usize>,
+}
+
+impl Image {
+    fn new(width: usize, height: usize) -> Image {
+        let pixels = vec![0; width * height];
+        Image {
+            width,
+            height,
+            pixels,
+        }
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                write!(f, "{}", self[(x, y)])?;
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl Index<(usize, usize)> for Image {
+    type Output = usize;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+impl IndexMut<(usize, usize)> for Image {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        &mut self.pixels[x + y * self.width]
+    }
+}
+
+impl FromStr for Image {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let rows: Vec<_> = s.lines().collect();
+        let width = rows[0].len();
+        let height = rows.len();
+        let pixels = rows
+            .iter()
+            .flat_map(|row| row.as_bytes().iter().map(|b| (b - b'0') as usize))
+            .collect();
+
+        Ok(Image {
+            width,
+            height,
+            pixels,
+        })
+    }
+}
+
+use std::{cmp::Ordering, collections::BinaryHeap};
+
+#[derive(Copy, Clone, Eq, PartialEq)]
+struct State {
+    cost: usize,
+    position: usize,
+}
+
+// The priority queue depends on `Ord`.
+// Explicitly implement the trait so the queue becomes a min-heap
+// instead of a max-heap.
+impl Ord for State {
+    fn cmp(&self, other: &Self) -> Ordering {
+        // Notice that the we flip the ordering on costs.
+        // In case of a tie we compare positions - this step is necessary
+        // to make implementations of `PartialEq` and `Ord` consistent.
+        other
+            .cost
+            .cmp(&self.cost)
+            .then_with(|| self.position.cmp(&other.position))
+    }
+}
+
+// `PartialOrd` needs to be implemented as well.
+impl PartialOrd for State {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+// Each node is represented as a `usize`, for a shorter implementation.
+struct Edge {
+    node: usize,
+    cost: usize,
+}
+impl Debug for Edge {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        write!(f, "Edge{{node: {}, cost: {}}}", self.node, self.cost)?;
+        Ok(())
+    }
+}
+
+// From https://doc.rust-lang.org/std/collections/binary_heap/index.html
+
+// Dijkstra's shortest path algorithm.
+
+// Start at `start` and use `dist` to track the current shortest distance
+// to each node. This implementation isn't memory-efficient as it may leave duplicate
+// nodes in the queue. It also uses `usize::MAX` as a sentinel value,
+// for a simpler implementation.
+fn shortest_path(adj_list: &[Vec<Edge>], start: usize, goal: usize) -> Option<usize> {
+    // dist[node] = current shortest distance from `start` to `node`
+    let mut dist: Vec<_> = (0..adj_list.len()).map(|_| usize::MAX).collect();
+
+    let mut heap = BinaryHeap::new();
+
+    // We're at `start`, with a zero cost
+    dist[start] = 0;
+    heap.push(State {
+        cost: 0,
+        position: start,
+    });
+
+    // Examine the frontier with lower cost nodes first (min-heap)
+    while let Some(State { cost, position }) = heap.pop() {
+        // Alternatively we could have continued to find all shortest paths
+        if position == goal {
+            return Some(cost);
+        }
+
+        // Important as we may have already found a better way
+        if cost > dist[position] {
+            continue;
+        }
+
+        // For each node we can reach, see if we can find a way with
+        // a lower cost going through this node
+        for edge in &adj_list[position] {
+            let next = State {
+                cost: cost + edge.cost,
+                position: edge.node,
+            };
+
+            // If so, add it to the frontier and continue
+            if next.cost < dist[next.position] {
+                heap.push(next);
+                // Relaxation, we have now found a better way
+                dist[next.position] = next.cost;
+            }
+        }
+    }
+
+    // Goal not reachable
+    None
+}
+
+fn make_graph(im: &Image) -> Vec<Vec<Edge>> {
+    let idx = |x, y| y * im.width + x;
+    let mut graph: Vec<_> = Vec::new();
+    for y in 0..im.height {
+        for x in 0..im.width {
+            let mut edges = Vec::new();
+            if x > 0 {
+                edges.push(Edge {
+                    node: idx(x - 1, y),
+                    cost: im[(x - 1, y)],
+                });
+            }
+            if x < im.width - 1 {
+                edges.push(Edge {
+                    node: idx(x + 1, y),
+                    cost: im[(x + 1, y)],
+                });
+            }
+            if y > 0 {
+                edges.push(Edge {
+                    node: idx(x, y - 1),
+                    cost: im[(x, y - 1)],
+                });
+            }
+            if y < im.height - 1 {
+                edges.push(Edge {
+                    node: idx(x, y + 1),
+                    cost: im[(x, y + 1)],
+                });
+            }
+            graph.push(edges);
+        }
+    }
+    graph
+}
+
+#[aoc(day15, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let im: Image = input.parse()?;
+    let graph = make_graph(&im);
+    Ok(shortest_path(&graph, 0, im.pixels.len() - 1).unwrap())
+}
+
+fn x5(im: &Image) -> Image {
+    let mut im5 = Image::new(im.width * 5, im.height * 5);
+    for iy in 0..5 {
+        for ix in 0..5 {
+            for y in 0..im.height {
+                for x in 0..im.width {
+                    let v = im[(x, y)] + ix + iy;
+                    let dst_x = ix * im.width + x;
+                    let dst_y = iy * im.height + y;
+                    im5[(dst_x, dst_y)] = if v > 9 { v % 9 } else { v };
+                }
+            }
+        }
+    }
+    im5
+}
+
+#[aoc(day15, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let im: Image = input.parse()?;
+    let im = x5(&im);
+    let graph = make_graph(&im);
+    Ok(shortest_path(&graph, 0, im.pixels.len() - 1).unwrap())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
+"#
+        .trim();
+        assert_eq!(part1(input)?, 40);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 315);
+        Ok(())
+    }
+}

2021/src/day16.rs

@@ -0,0 +1,245 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+fn hex(b: &u8) -> u8 {
+    if *b >= b'A' {
+        10 + b - b'A'
+    } else {
+        b - b'0'
+    }
+}
+
+fn sum_version(packet: &Packet) -> u64 {
+    fn sum_packets(packets: &[Packet]) -> u64 {
+        packets.iter().map(sum_version).sum()
+    }
+    packet.version as u64
+        + match &packet.packet_type {
+            PacketType::Sum(packets) => sum_packets(packets),
+            PacketType::Product(packets) => sum_packets(packets),
+            PacketType::Minimum(packets) => sum_packets(packets),
+            PacketType::Maximum(packets) => sum_packets(packets),
+            PacketType::Literal(_) => 0,
+            PacketType::GreaterThan(packets) => sum_packets(packets),
+            PacketType::LessThan(packets) => sum_packets(packets),
+            PacketType::Equal(packets) => sum_packets(packets),
+        }
+}
+
+fn interpret(packet: &Packet) -> u64 {
+    match &packet.packet_type {
+        PacketType::Sum(packets) => packets.iter().map(interpret).sum(),
+        PacketType::Product(packets) => packets.iter().map(interpret).product(),
+        PacketType::Minimum(packets) => packets.iter().map(interpret).min().unwrap(),
+        PacketType::Maximum(packets) => packets.iter().map(interpret).max().unwrap(),
+        PacketType::Literal(v) => *v,
+        PacketType::GreaterThan(packets) => {
+            if interpret(&packets[0]) > interpret(&packets[1]) {
+                1
+            } else {
+                0
+            }
+        }
+        PacketType::LessThan(packets) => {
+            if interpret(&packets[0]) < interpret(&packets[1]) {
+                1
+            } else {
+                0
+            }
+        }
+        PacketType::Equal(packets) => {
+            if interpret(&packets[0]) == interpret(&packets[1]) {
+                1
+            } else {
+                0
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+enum PacketType {
+    // 0
+    Sum(Vec<Packet>),
+    // 1
+    Product(Vec<Packet>),
+    // 2
+    Minimum(Vec<Packet>),
+    // 3
+    Maximum(Vec<Packet>),
+    // 4
+    Literal(u64),
+    // 5
+    GreaterThan(Vec<Packet>),
+    // 6
+    LessThan(Vec<Packet>),
+    // 7
+    Equal(Vec<Packet>),
+}
+
+#[derive(Debug)]
+struct Packet {
+    version: u64,
+    bit_size: u64,
+    packet_type: PacketType,
+}
+
+struct Parser<'a> {
+    bytes: &'a [u8],
+    tmp: u64,
+    tmp_len: usize,
+}
+
+impl<'a> Parser<'a> {
+    fn new(input: &str) -> Parser {
+        Parser {
+            bytes: input.as_bytes(),
+            tmp: 0,
+            tmp_len: 0,
+        }
+    }
+    fn read(&mut self, n: usize) -> u64 {
+        assert!(n < 32, "can't read more than 32 bits at time");
+        //print!( "   BEGIN n {0} tmp 0b{1:b} len {2}    - ", n, self.tmp, self.tmp_len);
+        while self.tmp_len < n {
+            let mut buf = [0; 1];
+            self.bytes.read_exact(&mut buf).expect("EOF");
+            // Convert the byte from hexdecimal to binary and merge with any leftover bits.
+            self.tmp = (self.tmp << 4) | hex(&buf[0]) as u64;
+            self.tmp_len += 4;
+        }
+
+        let mask = (1 << n) - 1;
+        self.tmp_len -= n;
+        let v = (self.tmp >> self.tmp_len) & mask;
+
+        let mask = (1 << self.tmp_len) - 1;
+        self.tmp &= mask;
+
+        //println!( "   END n {0} tmp 0b{2:b} len {3} v 0b{1:00$b} ", n, v, self.tmp, self.tmp_len);
+        v as u64
+    }
+}
+
+fn parse_packet(p: &mut Parser) -> Packet {
+    let mut bit_size: u64 = 0;
+    let version = p.read(3);
+    bit_size += 3;
+    let packet_type_id = p.read(3);
+    bit_size += 3;
+    let packet_type = if packet_type_id == 4 {
+        // Literal, read 5 bits at a time until MSB is 0
+        let mut v = 0;
+        loop {
+            let l = p.read(5);
+            v = (v << 4) | (l & 0b1111);
+            bit_size += 5;
+            if 0b10000 & l == 0 {
+                break;
+            }
+        }
+        PacketType::Literal(v)
+    } else {
+        // length type ID
+        let ltid = p.read(1);
+        bit_size += 1;
+        let mut packets = Vec::new();
+        if ltid == 0 {
+            // If the length type ID is 0, then the next 15 bits are a number that represents the total length in bits of the sub-packets contained by this packet.
+            let len = p.read(15);
+            bit_size += 15;
+            let mut sub_bits = 0;
+            while sub_bits < len {
+                let sub_p = parse_packet(p);
+                bit_size += sub_p.bit_size;
+                sub_bits += sub_p.bit_size;
+                packets.push(sub_p);
+            }
+        } else {
+            // If the length type ID is 1, then the next 11 bits are a number that represents the number of sub-packets immediately contained by this packet.
+            let num = p.read(11);
+            bit_size += 11;
+            for _ in 0..num {
+                let sub_p = parse_packet(p);
+                bit_size += sub_p.bit_size;
+                packets.push(sub_p);
+            }
+        }
+        match packet_type_id {
+            0 => PacketType::Sum(packets),
+            1 => PacketType::Product(packets),
+            2 => PacketType::Minimum(packets),
+            3 => PacketType::Maximum(packets),
+            5 => PacketType::GreaterThan(packets),
+            6 => PacketType::LessThan(packets),
+            7 => PacketType::Equal(packets),
+            _ => panic!("unknown packet type ID {}", packet_type_id),
+        }
+    };
+    Packet {
+        version,
+        bit_size,
+        packet_type,
+    }
+}
+
+#[aoc(day16, part1)]
+fn part1(input: &str) -> Result<u64> {
+    let mut p = Parser::new(input);
+    let packet = parse_packet(&mut p);
+    Ok(sum_version(&packet))
+}
+
+#[aoc(day16, part2)]
+fn part2(input: &str) -> Result<u64> {
+    let mut p = Parser::new(input);
+    let packet = parse_packet(&mut p);
+    Ok(interpret(&packet))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = vec![
+            ("D2FE28", 6),
+            //("38006F45291200", 1 + 0 + 0),
+            ("8A004A801A8002F478", 16),
+            ("620080001611562C8802118E34", 12),
+            ("C0015000016115A2E0802F182340", 23),
+            ("A0016C880162017C3686B18A3D4780", 31),
+        ];
+        for (inp, want) in input {
+            print!("\nTesting '{}'\n - ", inp);
+            inp.as_bytes().iter().for_each(|c| print!("{:04b}", hex(c)));
+            println!();
+            assert_eq!(part1(inp)?, want);
+            println!("Passed '{}'", inp);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = vec![
+            ("C200B40A82", 3),
+            ("04005AC33890", 54),
+            ("880086C3E88112", 7),
+            ("CE00C43D881120", 9),
+            ("D8005AC2A8F0", 1),
+            ("F600BC2D8F", 0),
+            ("9C005AC2F8F0", 0),
+            ("9C0141080250320F1802104A08", 1),
+        ];
+        for (inp, want) in input {
+            print!("\nTesting '{}'\n - ", inp);
+            inp.as_bytes().iter().for_each(|c| print!("{:04b}", hex(c)));
+            println!();
+            assert_eq!(part2(inp)?, want);
+            println!("Passed '{}'", inp);
+        }
+        Ok(())
+    }
+}

2021/src/day17.rs

@@ -0,0 +1,107 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+#[derive(Debug)]
+struct Target {
+    x_min: isize,
+    x_max: isize,
+    y_min: isize,
+    y_max: isize,
+}
+
+impl Target {
+    fn hit(&self, x: isize, y: isize) -> bool {
+        x >= self.x_min && x <= self.x_max && y >= self.y_min && y <= self.y_max
+    }
+}
+
+fn shoot(x: isize, y: isize, tgt: &Target) -> bool {
+    let mut x_inc = x;
+    let mut y_inc = y;
+    let mut x_cur = 0;
+    let mut y_cur = 0;
+    while x_cur <= tgt.x_max && y_cur >= tgt.y_min {
+        x_cur += x_inc;
+        y_cur += y_inc;
+        if x_inc > 0 {
+            x_inc -= 1;
+        }
+        y_inc -= 1;
+        if tgt.hit(x_cur, y_cur) {
+            return true;
+        }
+    }
+    false
+}
+
+impl FromStr for Target {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Target, Infallible> {
+        let parts: Vec<_> = input.split(' ').collect();
+        let x = &parts[2][2..].strip_suffix(',').unwrap();
+        let y = &parts[3][2..];
+        let (x_min, x_max) = x
+            .split_once("..")
+            .map(|(min, max)| (min.parse().unwrap(), max.parse().unwrap()))
+            .unwrap();
+        let (y_min, y_max) = y
+            .split_once("..")
+            .map(|(min, max)| (min.parse().unwrap(), max.parse().unwrap()))
+            .unwrap();
+
+        Ok(Target {
+            x_min,
+            x_max,
+            y_min,
+            y_max,
+        })
+    }
+}
+
+#[aoc(day17, part1)]
+fn part1(input: &str) -> Result<isize> {
+    let tgt: Target = input.parse()?;
+    let n = tgt.y_min.abs() - 1;
+    Ok(n * (n + 1) / 2)
+}
+
+#[aoc(day17, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let tgt: Target = input.parse()?;
+    let mut cnt = 0;
+    let y_range = tgt.y_min.abs().max(tgt.y_min.abs());
+    for y in -y_range..=y_range {
+        for x in 1..=tgt.x_max {
+            if shoot(x, y, &tgt) {
+                cnt += 1;
+            }
+        }
+    }
+    Ok(cnt)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+target area: x=20..30, y=-10..-5
+"#
+        .trim();
+        assert_eq!(part1(input)?, 45);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+target area: x=20..30, y=-10..-5
+"#
+        .trim();
+        assert_eq!(part2(input)?, 112);
+        Ok(())
+    }
+}

2021/src/day18.rs

@@ -0,0 +1,732 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+use std::{
+    io::{BufReader, Cursor, Read},
+    ops::Add,
+};
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+enum ChildType {
+    None,
+    Value(usize),
+    Subtree(Idx),
+}
+
+#[derive(Copy, Clone, Default, PartialEq)]
+struct Idx(usize);
+
+impl Debug for Idx {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl Display for Idx {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+#[derive(Debug, PartialEq)]
+struct Node {
+    deleted: bool,
+    idx: Idx,
+    parent: Option<Idx>,
+    left: ChildType,
+    right: ChildType,
+}
+// Tree needs to support merging two into one for adding snailfish numbers.
+// Tree needs to support rightward and leftward depth first searches to find neighbors for applying
+// exploded spill over.
+// Need to support remove and/or replace for explode.
+// Need to support insert and/or replace for split.
+#[derive(Debug, Default)]
+struct Tree {
+    root: Idx,
+    nodes: Vec<Node>,
+}
+
+struct TreeIter {
+    it: std::vec::IntoIter<Idx>,
+}
+
+impl TreeIter {
+    fn new(indices: &[Idx]) -> TreeIter {
+        let indices = indices.to_vec();
+        TreeIter {
+            it: indices.into_iter(),
+        }
+    }
+}
+
+impl Iterator for TreeIter {
+    type Item = Idx;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.it.next()
+    }
+}
+
+impl PartialEq for Tree {
+    fn eq(&self, other: &Self) -> bool {
+        // Lazy but should work.
+        self.to_string() == other.to_string()
+    }
+}
+
+fn read_byte<R: Read>(reader: &mut R) -> std::io::Result<Option<u8>> {
+    reader.bytes().next().transpose()
+}
+
+impl Tree {
+    fn reduce(&mut self) {
+        let mut changed = true;
+        while changed {
+            changed = self.explode();
+            println!("after explode {}", self);
+            if changed {
+                continue;
+            }
+            changed = self.split();
+            println!("after split {}", self);
+            //println!("splice changed {}", changed);
+        }
+    }
+    fn magnitude(&self) -> usize {
+        fn inner(tree: &Tree, node: &Node) -> usize {
+            match (node.left, node.right) {
+                (ChildType::Value(l), ChildType::Value(r)) => 3 * l + 2 * r,
+                (ChildType::Subtree(idx), ChildType::Value(r)) => {
+                    3 * inner(&tree, &tree[idx]) + 2 * r
+                }
+                (ChildType::Value(l), ChildType::Subtree(idx)) => {
+                    3 * l + 2 * inner(&tree, &tree[idx])
+                }
+                (ChildType::Subtree(l_idx), ChildType::Subtree(r_idx)) => {
+                    3 * inner(&tree, &tree[l_idx]) + 2 * inner(&tree, &tree[r_idx])
+                }
+                _ => panic!("unhandled combo for magnitude"),
+            }
+        }
+        inner(self, &self[self.root])
+    }
+
+    fn split(&mut self) -> bool {
+        if let Some(split_idx) = self
+            .left_to_right()
+            .skip_while(|idx| {
+                let n = &self[*idx];
+                if let ChildType::Value(v) = n.left {
+                    if v > 9 {
+                        return false;
+                    }
+                }
+                if let ChildType::Value(v) = n.right {
+                    if v > 9 {
+                        return false;
+                    }
+                }
+                true
+            })
+            .next()
+        {
+            if let ChildType::Value(v) = self[split_idx].left {
+                if v > 9 {
+                    let l = v / 2;
+                    let r = if v % 2 == 1 { 1 + v / 2 } else { v / 2 };
+                    let mut new_idx = self.add_node(ChildType::Value(l), ChildType::Value(r));
+                    self[new_idx].parent = Some(split_idx);
+                    self[split_idx].left = ChildType::Subtree(new_idx);
+                }
+            }
+            if let ChildType::Value(v) = self[split_idx].right {
+                if v > 9 {
+                    let l = v / 2;
+                    let r = if v % 2 == 1 { 1 + v / 2 } else { v / 2 };
+                    let mut new_idx = self.add_node(ChildType::Value(l), ChildType::Value(r));
+                    self[new_idx].parent = Some(split_idx);
+                    self[split_idx].right = ChildType::Subtree(new_idx);
+                }
+            }
+            return true;
+        }
+        false
+    }
+    fn explode(&mut self) -> bool {
+        let mut changed = false;
+        if let Some(node) = self
+            .nodes
+            .iter()
+            .filter(|n| !n.deleted)
+            .find(|n| self.depth(n) >= 4)
+        {
+            changed = true;
+            let ex_idx = node.idx;
+            // Find spillover to the right
+            if let Some(spillover) = self
+                .left_to_right()
+                .skip_while(|idx| *idx != ex_idx)
+                .skip(1)
+                .find(|idx| {
+                    let n = &self[*idx];
+                    match (n.left, n.right) {
+                        (ChildType::Subtree(_), ChildType::Subtree(_)) => false,
+                        _ => true,
+                    }
+                })
+            {
+                let src = self[ex_idx].right;
+                let tgt = &mut self[spillover];
+                if let (ChildType::Value(l), ChildType::Value(r)) = (src, tgt.left) {
+                    tgt.left = ChildType::Value(l + r);
+                } else if let (ChildType::Value(l), ChildType::Value(r)) = (src, tgt.right) {
+                    tgt.right = ChildType::Value(l + r);
+                } else {
+                    unreachable!()
+                };
+            }
+            // Find spillover to the left
+            if let Some(spillover) = self
+                .right_to_left()
+                .skip_while(|idx| *idx != ex_idx)
+                .skip(1)
+                .find(|idx| {
+                    let n = &self[*idx];
+                    match (n.left, n.right) {
+                        (ChildType::Subtree(_), ChildType::Subtree(_)) => false,
+                        _ => true,
+                    }
+                })
+            {
+                let src = self[ex_idx].left;
+                let tgt = &mut self[spillover];
+                if let (ChildType::Value(l), ChildType::Value(r)) = (src, tgt.right) {
+                    tgt.right = ChildType::Value(l + r);
+                } else if let (ChildType::Value(l), ChildType::Value(r)) = (src, tgt.left) {
+                    tgt.left = ChildType::Value(l + r);
+                } else {
+                    unreachable!()
+                };
+            }
+            // Replace exploded node
+            self[ex_idx].deleted = true;
+            let p_idx = self[ex_idx].parent.expect("exploded root");
+            let p = &mut self[p_idx];
+            if let ChildType::Subtree(idx) = p.left {
+                if idx == ex_idx {
+                    p.left = ChildType::Value(0);
+                }
+            }
+            if let ChildType::Subtree(idx) = p.right {
+                if idx == ex_idx {
+                    p.right = ChildType::Value(0);
+                }
+            }
+        }
+        changed
+    }
+    fn depth(&self, node: &Node) -> usize {
+        if let Some(parent_idx) = node.parent {
+            1 + self.depth(&self[parent_idx])
+        } else {
+            0
+        }
+    }
+    fn find_root(&self, node: &Node) -> Idx {
+        match node.parent {
+            Some(parent_idx) => self.find_root(&self[parent_idx]),
+            None => node.idx,
+        }
+    }
+    fn add_node(&mut self, left: ChildType, right: ChildType) -> Idx {
+        let idx = Idx(self.nodes.len());
+        self.nodes.push(Node {
+            deleted: false,
+            idx,
+            parent: None,
+            left,
+            right,
+        });
+        idx
+    }
+
+    fn from_str_node(&mut self, r: &mut BufReader<Cursor<&[u8]>>) -> ChildType {
+        let mut parsing_left = true;
+        // Can this be rewritten to eliminate the need for `None`?
+        let mut left = ChildType::None;
+        let mut right = ChildType::None;
+        while let Ok(Some(b)) = read_byte(r) {
+            match b {
+                b'[' => {
+                    let node = self.from_str_node(r);
+                    if parsing_left {
+                        left = node;
+                    } else {
+                        right = node;
+                    }
+                }
+                b']' => {
+                    let mut left_idx = None;
+                    let mut right_idx = None;
+                    if let ChildType::Subtree(idx) = left {
+                        left_idx = Some(idx);
+                    }
+                    if let ChildType::Subtree(idx) = right {
+                        right_idx = Some(idx);
+                    }
+                    let child_idx = self.add_node(left, right);
+                    if let Some(idx) = left_idx {
+                        self[idx].parent = Some(child_idx);
+                    }
+                    if let Some(idx) = right_idx {
+                        self[idx].parent = Some(child_idx);
+                    }
+                    return ChildType::Subtree(child_idx);
+                }
+                b',' => parsing_left = false,
+                b'0'..=b'9' => {
+                    let mut v = b - b'0';
+                    if let Ok(Some(peek)) = read_byte(r) {
+                        match peek {
+                            b'0'..=b'9' => v = (peek - b'0') + 10 * v,
+                            // Wasn't a number >9, push the byte back into the buffer.
+                            _ => r.seek_relative(-1).expect("failed to seek"),
+                        }
+                    }
+                    if parsing_left {
+                        left = ChildType::Value(v.into());
+                        parsing_left = false;
+                    } else {
+                        right = ChildType::Value(v.into());
+                    }
+                    continue;
+                }
+                _ => panic!("unknown byte '{}'", b),
+            }
+        }
+        unreachable!()
+    }
+
+    fn fmt_node(&self, f: &mut Formatter<'_>, node: &Node) -> std::fmt::Result {
+        write!(f, "[")?;
+        match node.left {
+            ChildType::None => panic!("left node was None"),
+            ChildType::Value(v) => write!(f, "{}", v)?,
+            ChildType::Subtree(idx) => self.fmt_node(f, &self[idx])?,
+        };
+        write!(f, ",")?;
+        match node.right {
+            ChildType::None => panic!("right node was None"),
+            ChildType::Value(v) => write!(f, "{}", v)?,
+            ChildType::Subtree(idx) => self.fmt_node(f, &self[idx])?,
+        };
+        write!(f, "]")?;
+        Ok(())
+    }
+
+    fn left_to_right(&mut self) -> TreeIter {
+        fn dfs(tree: &Tree, n: &Node, mut indices: &mut Vec<Idx>) {
+            if let ChildType::Subtree(idx) = n.left {
+                dfs(tree, &tree[idx], indices);
+            }
+            indices.push(n.idx);
+            if let ChildType::Subtree(idx) = n.right {
+                dfs(tree, &tree[idx], indices);
+            }
+        }
+        let mut indices = Vec::with_capacity(self.nodes.len());
+        dfs(self, &self[self.root], &mut indices);
+        TreeIter::new(&indices)
+    }
+    fn right_to_left(&mut self) -> TreeIter {
+        fn dfs(tree: &Tree, n: &Node, mut indices: &mut Vec<Idx>) {
+            if let ChildType::Subtree(idx) = n.right {
+                dfs(tree, &tree[idx], indices);
+            }
+            indices.push(n.idx);
+            if let ChildType::Subtree(idx) = n.left {
+                dfs(tree, &tree[idx], indices);
+            }
+        }
+        let mut indices = Vec::with_capacity(self.nodes.len());
+        dfs(self, &self[self.root], &mut indices);
+        TreeIter::new(&indices)
+    }
+}
+
+impl Add for Tree {
+    type Output = Tree;
+
+    fn add(self, other: Self) -> Self {
+        // This is lazy but works for simple any obvious reasons (if FromStr and Display work
+        // correctly).
+        format!("[{},{}]", self, other)
+            .parse()
+            .expect("failed to parse merge tree")
+    }
+}
+
+impl FromStr for Tree {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Tree, Infallible> {
+        let mut tree = Tree::default();
+        let mut bytes = input.as_bytes();
+        assert_eq!(
+            read_byte(&mut bytes).expect("couldn't read first byte"),
+            Some(b'[')
+        );
+        let mut b = BufReader::new(Cursor::new(bytes));
+        tree.from_str_node(&mut b);
+        tree.root = tree.find_root(&tree[Idx(0)]);
+        Ok(tree)
+    }
+}
+
+impl Index<Idx> for Tree {
+    type Output = Node;
+    fn index(&self, idx: Idx) -> &Self::Output {
+        &self.nodes[idx.0]
+    }
+}
+
+impl IndexMut<Idx> for Tree {
+    fn index_mut(&mut self, idx: Idx) -> &mut Self::Output {
+        &mut self.nodes[idx.0]
+    }
+}
+
+impl Display for Tree {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        if self.nodes.is_empty() {
+            return write!(f, "[]");
+        }
+
+        let node = &self[self.root];
+        self.fmt_node(f, &node)?;
+        Ok(())
+    }
+}
+
+fn sum(input: &str) -> Tree {
+    input
+        .lines()
+        .map(|l| l.parse().expect("failed to parse"))
+        .reduce(|acc, t| acc + t)
+        .expect("failed to reduce")
+}
+
+#[aoc(day18, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let nums: Vec<Tree> = input
+        .lines()
+        .map(|l| {
+            dbg!(l);
+            l.parse().expect("failed to parse")
+        })
+        .collect();
+    let mut it = nums.into_iter();
+    let mut last = it.next().unwrap();
+    while let Some(next) = it.next() {
+        println!("  {}", last);
+        println!("+ {}", next);
+        last = last + next;
+        println!("= {}", last);
+        last.reduce();
+        println!("= {}\n", last);
+    }
+    Ok(last.magnitude())
+}
+
+/*
+#[aoc(day18, part2)]
+fn part2(input: &str) -> Result<usize> {
+todo!("part2");
+Ok(0)
+}
+*/
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_display() -> Result<()> {
+        for (i, s) in ["[1,2]", "[[1,2],3]", "[1,[2,3]]", "[[1,2],[3,4]]"]
+            .into_iter()
+            .enumerate()
+        {
+            let t = s.parse::<Tree>()?;
+            assert_eq!(&t.to_string(), s, "input {}: '{}'", i, s);
+            //assert_eq!(&t.to_string(), s, "input {}: '{}'\ntree: {:#?}", i, s, t);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_sum() -> Result<()> {
+        let l: Tree = "[1,2]".parse().unwrap();
+        let r: Tree = "[[3,4],5]".parse().unwrap();
+        assert_eq!(l + r, "[[1,2],[[3,4],5]]".parse().unwrap());
+
+        let input = r#"
+[[[[4,3],4],4],[7,[[8,4],9]]]
+[1,1]
+    "#
+        .trim();
+        let mut s = sum(input);
+        s.reduce();
+        assert_eq!(s.to_string(), "[[[[0,7],4],[[7,8],[6,0]]],[8,1]]");
+        Ok(())
+    }
+
+    #[test]
+    fn test_reduce() -> Result<()> {
+        for (input, want) in [
+            ("[0,[0,[0,[0,[0,0]]]]]", "[0,[0,[0,[0,0]]]]"),
+            ("[[[[[[[[0,0],0],0],0],0],0],0],0]", "[[[[0,0],0],0],0]"),
+            ("[[[[[[[0,0],0],0],0],0],0],0]", "[[[[0,0],0],0],0]"),
+        ] {
+            println!("== test_reduce: {}", input);
+            let mut tree: Tree = input.parse()?;
+            tree.reduce();
+            let want = want.parse()?;
+            assert_eq!(tree, want, "\nInput {} Got {} Want {}", input, tree, want);
+        }
+        Ok(())
+    }
+    #[test]
+    fn test_explode() -> Result<()> {
+        for (input, want) in [
+            ("[[[[0,0],0],0],0]", "[[[[0,0],0],0],0]"),
+            ("[[[0,0],0],0]", "[[[0,0],0],0]"),
+            ("[[0,0],0]", "[[0,0],0]"),
+            ("[0,[0,[0,[0,0]]]]", "[0,[0,[0,[0,0]]]]"),
+            ("[0,[0,[0,0]]]", "[0,[0,[0,0]]]"),
+            ("[0,[0,0]]", "[0,[0,0]]"),
+            ("[[[[[9,8],1],2],3],4]", "[[[[0,9],2],3],4]"),
+            ("[7,[6,[5,[4,[3,2]]]]]", "[7,[6,[5,[7,0]]]]"),
+            ("[[6,[5,[4,[3,2]]]],1]", "[[6,[5,[7,0]]],3]"),
+            (
+                "[[3,[2,[1,[7,3]]]],[6,[5,[4,[3,2]]]]]",
+                "[[3,[2,[8,0]]],[9,[5,[4,[3,2]]]]]",
+            ),
+            (
+                "[[3,[2,[8,0]]],[9,[5,[4,[3,2]]]]]",
+                "[[3,[2,[8,0]]],[9,[5,[7,0]]]]",
+            ),
+        ] {
+            println!("== test_explode: {}", input);
+            let mut tree: Tree = input.parse()?;
+            tree.explode();
+            let want = want.parse()?;
+            assert_eq!(tree, want, "\nInput {} Got {} Want {}", input, tree, want);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_split() -> Result<()> {
+        for (input, want) in [
+            ("[10,0]", "[[5,5],0]"), //
+            ("[0,11]", "[0,[5,6]]"),
+            ("[[0,11],0]", "[[0,[5,6]],0]"),
+            ("[11,0]", "[[5,6],0]"),
+            ("[0,[11,0]]", "[0,[[5,6],0]]"),
+            ("[12,0]", "[[6,6],0]"),
+            ("[0,12]", "[0,[6,6]]"),
+        ] {
+            println!("== test_split: {}", input);
+            let mut tree: Tree = input.parse()?;
+            dbg!(&tree);
+            tree.split();
+            let want = want.parse()?;
+            assert_eq!(tree, want, "\nInput {} Got {} Want {}", input, tree, want);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_magnitude() -> Result<()> {
+        for (input, want) in [
+            ("[9,1]", 29),
+            ("[1,9]", 21),
+            ("[[9,1],[1,9]]", 129),
+            ("[[1,2],[[3,4],5]]", 143),
+            ("[[[[0,7],4],[[7,8],[6,0]]],[8,1]]", 1384),
+            ("[[[[1,1],[2,2]],[3,3]],[4,4]]", 445),
+            ("[[[[3,0],[5,3]],[4,4]],[5,5]]", 791),
+            ("[[[[5,0],[7,4]],[5,5]],[6,6]]", 1137),
+            (
+                "[[[[8,7],[7,7]],[[8,6],[7,7]]],[[[0,7],[6,6]],[8,7]]]",
+                3488,
+            ),
+        ] {
+            let tree: Tree = input.parse()?;
+            assert_eq!(tree.magnitude(), want);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_add_and_reduce() -> Result<()> {
+        for (input, want) in [
+            (
+                r#"
+[1,1]
+[2,2]
+[3,3]
+[4,4]
+"#,
+                "[[[[1,1],[2,2]],[3,3]],[4,4]]",
+            ),
+            (
+                r#"
+[1,1]
+[2,2]
+[3,3]
+[4,4]
+[5,5]
+    "#
+                .trim(),
+                "[[[[3,0],[5,3]],[4,4]],[5,5]]",
+            ),
+            (
+                r#"
+[1,1]
+[2,2]
+[3,3]
+[4,4]
+[5,5]
+[6,6]
+    "#
+                .trim(),
+                "[[[[5,0],[7,4]],[5,5]],[6,6]]",
+            ),
+            (
+                r#"
+[[[[4,3],4],4],[7,[[8,4],9]]]
+[1,1]
+"#
+                .trim(),
+                "[[[[0,7],4],[[7,8],[6,0]]],[8,1]]",
+            ),
+        ] {
+            println!("== 1. test_add_and_reduce: {}", input);
+            let mut num = sum(input.trim());
+            println!("before reduce: {}", num);
+            num.reduce();
+            println!("after reduce: {}", num);
+            assert_eq!(num.to_string(), want);
+        }
+
+        for (l, r, eq) in [
+            (
+                "[[[[4,3],4],4],[7,[[8,4],9]]]",
+                "[1,1]",
+                "[[[[0,7],4],[[7,8],[6,0]]],[8,1]]",
+            ),
+            (
+                "[[[0,[4,5]],[0,0]],[[[4,5],[2,6]],[9,5]]]",
+                "[7,[[[3,7],[4,3]],[[6,3],[8,8]]]]",
+                "[[[[4,0],[5,4]],[[7,7],[6,0]]],[[8,[7,7]],[[7,9],[5,0]]]]",
+            ),
+            (
+                "[[[[4,0],[5,4]],[[7,7],[6,0]]],[[8,[7,7]],[[7,9],[5,0]]]]",
+                "[[2,[[0,8],[3,4]]],[[[6,7],1],[7,[1,6]]]]",
+                "[[[[6,7],[6,7]],[[7,7],[0,7]]],[[[8,7],[7,7]],[[8,8],[8,0]]]]",
+            ),
+            (
+                "[[[[6,7],[6,7]],[[7,7],[0,7]]],[[[8,7],[7,7]],[[8,8],[8,0]]]]",
+                "[[[[2,4],7],[6,[0,5]]],[[[6,8],[2,8]],[[2,1],[4,5]]]]",
+                "[[[[7,0],[7,7]],[[7,7],[7,8]]],[[[7,7],[8,8]],[[7,7],[8,7]]]]",
+            ),
+            (
+                "[[[[7,0],[7,7]],[[7,7],[7,8]]],[[[7,7],[8,8]],[[7,7],[8,7]]]]",
+                "[7,[5,[[3,8],[1,4]]]]",
+                "[[[[7,7],[7,8]],[[9,5],[8,7]]],[[[6,8],[0,8]],[[9,9],[9,0]]]]",
+            ),
+            (
+                "[[[[7,7],[7,8]],[[9,5],[8,7]]],[[[6,8],[0,8]],[[9,9],[9,0]]]]",
+                "[[2,[2,2]],[8,[8,1]]]",
+                "[[[[6,6],[6,6]],[[6,0],[6,7]]],[[[7,7],[8,9]],[8,[8,1]]]]",
+            ),
+            (
+                "[[[[6,6],[6,6]],[[6,0],[6,7]]],[[[7,7],[8,9]],[8,[8,1]]]]",
+                "[2,9]",
+                "[[[[6,6],[7,7]],[[0,7],[7,7]]],[[[5,5],[5,6]],9]]",
+            ),
+            (
+                "[[[[6,6],[7,7]],[[0,7],[7,7]]],[[[5,5],[5,6]],9]]",
+                "[1,[[[9,3],9],[[9,0],[0,7]]]]",
+                "[[[[7,8],[6,7]],[[6,8],[0,8]]],[[[7,7],[5,0]],[[5,5],[5,6]]]]",
+            ),
+            (
+                "[[[[7,8],[6,7]],[[6,8],[0,8]]],[[[7,7],[5,0]],[[5,5],[5,6]]]]",
+                "[[[5,[7,4]],7],1]",
+                "[[[[7,7],[7,7]],[[8,7],[8,7]]],[[[7,0],[7,7]],9]]",
+            ),
+            (
+                "[[[[7,7],[7,7]],[[8,7],[8,7]]],[[[7,0],[7,7]],9]]",
+                "[[[[4,2],2],6],[8,7]]",
+                "[[[[8,7],[7,7]],[[8,6],[7,7]]],[[[0,7],[6,6]],[8,7]]]",
+            ),
+        ] {
+            let l: Tree = l.parse()?;
+            let r: Tree = r.parse()?;
+            let mut num = l + r;
+            println!("== 2. test_add_and_reduce: {}", num);
+            println!("before reduce: {}", num);
+            num.reduce();
+            println!("after reduce: {}", num);
+            assert_eq!(num.to_string(), eq);
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+[[[0,[4,5]],[0,0]],[[[4,5],[2,6]],[9,5]]]
+[7,[[[3,7],[4,3]],[[6,3],[8,8]]]]
+[[2,[[0,8],[3,4]]],[[[6,7],1],[7,[1,6]]]]
+[[[[2,4],7],[6,[0,5]]],[[[6,8],[2,8]],[[2,1],[4,5]]]]
+[7,[5,[[3,8],[1,4]]]]
+[[2,[2,2]],[8,[8,1]]]
+[2,9]
+[1,[[[9,3],9],[[9,0],[0,7]]]]
+[[[5,[7,4]],7],1]
+[[[[4,2],2],6],[8,7]]
+    "#
+        .trim();
+
+        assert_eq!(part1(input)?, 3488);
+
+        let input = r#"
+[[[0,[5,8]],[[1,7],[9,6]]],[[4,[1,2]],[[1,4],2]]]
+[[[5,[2,8]],4],[5,[[9,9],0]]]
+[6,[[[6,2],[5,6]],[[7,6],[4,7]]]]
+[[[6,[0,7]],[0,9]],[4,[9,[9,0]]]]
+[[[7,[6,4]],[3,[1,3]]],[[[5,5],1],9]]
+[[6,[[7,3],[3,2]]],[[[3,8],[5,7]],4]]
+[[[[5,4],[7,7]],8],[[8,3],8]]
+[[9,3],[[9,9],[6,[4,9]]]]
+[[2,[[7,7],7]],[[5,8],[[9,3],[0,2]]]]
+[[[[5,2],5],[8,[3,7]]],[[5,[7,5]],[4,4]]]
+    "#
+        .trim();
+        assert_eq!(part1(input)?, 4140);
+        Ok(())
+    }
+
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+    let input = r#"
+    "#
+    .trim();
+    assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

2021/src/day19.rs

@@ -0,0 +1,469 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+use std::ops::{Add, Sub};
+
+#[derive(Clone, Copy, Default, Eq, Hash, PartialEq, PartialOrd, Ord)]
+struct Vec3([i64; 3]);
+
+impl Add for Vec3 {
+    type Output = Self;
+    fn add(self, other: Self) -> Self::Output {
+        Vec3([
+            self.0[0] + other.0[0],
+            self.0[1] + other.0[1],
+            self.0[2] + other.0[2],
+        ])
+    }
+}
+
+impl Sub for Vec3 {
+    type Output = Self;
+    fn sub(self, other: Self) -> Self::Output {
+        Vec3([
+            self.0[0] - other.0[0],
+            self.0[1] - other.0[1],
+            self.0[2] - other.0[2],
+        ])
+    }
+}
+
+impl Debug for Vec3 {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        write!(f, "<{:4},{:4},{:4}>", self.0[0], self.0[1], self.0[2])
+    }
+}
+
+impl FromStr for Vec3 {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Vec3, Infallible> {
+        let v: Vec<_> = input.split(',').map(|s| s.parse().unwrap()).collect();
+        Ok(Vec3(v.try_into().unwrap()))
+    }
+}
+
+#[derive(Debug)]
+struct Scanner {
+    id: usize,
+    offset: Option<Vec3>,
+    points: Vec<Vec3>,
+}
+
+impl Scanner {
+    fn translate(&mut self, distance: Vec3, orientation: [usize; 3], signs: [i64; 3]) {
+        for p in &mut self.points {
+            *p = Vec3([
+                signs[0] * p.0[orientation[0]] + distance.0[0],
+                signs[1] * p.0[orientation[1]] + distance.0[1],
+                signs[2] * p.0[orientation[2]] + distance.0[2],
+            ]);
+        }
+    }
+}
+
+impl FromStr for Scanner {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Scanner, Infallible> {
+        let mut it = input.lines();
+        let id = it
+            .next()
+            .unwrap()
+            .split(' ')
+            .nth(2)
+            .unwrap()
+            .parse()
+            .unwrap();
+        Ok(Scanner {
+            id,
+            offset: None,
+            points: it.map(|l| l.parse().unwrap()).collect(),
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+struct Match {
+    abs_points: Vec<Vec3>,
+    distance: Vec3,
+    orientation: [usize; 3],
+    signs: [i64; 3],
+}
+
+// Returns overlap, and  in s1 space
+fn find_overlap(s1: &Scanner, s2: &Scanner) -> Option<Match> {
+    let mut counts: HashMap<(Vec3, [usize; 3], [i64; 3]), Vec<Vec3>> = HashMap::new();
+    let orientations = [
+        [0, 1, 2],
+        [0, 2, 1],
+        [1, 0, 2],
+        [1, 2, 0],
+        [2, 0, 1],
+        [2, 1, 0],
+    ];
+    let signs = [
+        [-1, -1, -1],
+        [1, -1, -1],
+        [-1, 1, -1],
+        [1, 1, -1],
+        [-1, -1, 1],
+        [1, -1, 1],
+        [-1, 1, 1],
+    ];
+    for v1 in &s1.points {
+        for v2 in &s2.points {
+            for or in orientations {
+                for sign in signs {
+                    let [x, y, z] = sign;
+                    let v = Vec3([x * v2.0[or[0]], y * v2.0[or[1]], z * v2.0[or[2]]]);
+                    let diff = *v1 - v;
+                    counts.entry((diff, or, sign)).or_default().push(*v1);
+                }
+            }
+        }
+    }
+    if let Some(((distance, orientation, signs), list)) =
+        counts.into_iter().find(|(_k, v)| v.len() >= 12)
+    {
+        // s1's points should already be in absolute coords.  s2 will be translated in
+        // part1().
+        return Some(Match {
+            abs_points: list,
+            distance,
+            orientation,
+            signs,
+        });
+    }
+    None
+}
+
+fn parse(input: &str) -> Result<Vec<Scanner>> {
+    input.split("\n\n").map(|s| Ok(s.parse()?)).collect()
+}
+#[aoc(day19, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let mut scanner = parse(input)?;
+    // Assign the first scanner to the origin (0,0,0).
+    // Put that in a list of recently registered scanners.
+    // In a loop
+    // - For each recently registered scanner, attempt to find overlap with each unregistered
+    // scanner.
+    // - Matches should be translated according to the offsets found during the match. This should
+    // put them in absolute space.
+    // - Each match should be added to the recently registered list for the next iteration.
+    // - Do this until all scanners are registered.
+    scanner[0].offset = Some(Vec3::default());
+    let (mut registered, mut unregistered): (VecDeque<_>, VecDeque<_>) =
+        scanner.into_iter().partition(|s| s.offset.is_some());
+
+    let mut becons = HashSet::new();
+    let mut done = Vec::new();
+    while let Some(reg) = registered.pop_front() {
+        let mut unregs = VecDeque::new();
+        for mut unreg in unregistered {
+            if let Some(mat) = find_overlap(&reg, &unreg) {
+                unreg.offset = Some(mat.distance);
+                unreg.translate(mat.distance, mat.orientation, mat.signs);
+                println!(
+                    "scanner {} @ {:?} found {} hits",
+                    &unreg.id,
+                    &unreg.offset.unwrap(),
+                    mat.abs_points.len()
+                );
+                registered.push_back(unreg);
+                for pt in mat.abs_points {
+                    becons.insert(pt);
+                }
+            } else {
+                unregs.push_back(unreg);
+            }
+        }
+        done.push(reg);
+        unregistered = unregs;
+    }
+
+    println!("before pass 2: {}", becons.len());
+    for i in 0..registered.len() {
+        for j in i..registered.len() {
+            let s1 = &registered[i];
+            let s2 = &registered[j];
+            if let Some(mat) = find_overlap(s1, s2) {
+                for pt in mat.abs_points {
+                    becons.insert(pt);
+                }
+            }
+        }
+    }
+    println!("after pass 2: {}", becons.len());
+
+    //assert_eq!(done.len(), 12);
+    let mut becons: Vec<_> = becons.iter().collect();
+    becons.sort();
+    dbg!(&becons);
+    Ok(becons.len())
+}
+
+/*
+#[aoc(day19, part2)]
+fn part2(input: &str) -> Result<usize> {
+todo!("part2");
+Ok(0)
+}
+*/
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_overlap() -> Result<()> {
+        use pretty_assertions::assert_eq;
+
+        let input = r#"
+--- scanner 0 ---
+404,-588,-901
+528,-643,409
+-838,591,734
+390,-675,-793
+-537,-823,-458
+-485,-357,347
+-345,-311,381
+-661,-816,-575
+-876,649,763
+-618,-824,-621
+553,345,-567
+474,580,667
+-447,-329,318
+-584,868,-557
+544,-627,-890
+564,392,-477
+455,729,728
+-892,524,684
+-689,845,-530
+423,-701,434
+7,-33,-71
+630,319,-379
+443,580,662
+-789,900,-551
+459,-707,401
+
+--- scanner 1 ---
+686,422,578
+605,423,415
+515,917,-361
+-336,658,858
+95,138,22
+-476,619,847
+-340,-569,-846
+567,-361,727
+-460,603,-452
+669,-402,600
+729,430,532
+-500,-761,534
+-322,571,750
+-466,-666,-811
+-429,-592,574
+-355,545,-477
+703,-491,-529
+-328,-685,520
+413,935,-424
+-391,539,-444
+586,-435,557
+-364,-763,-893
+807,-499,-711
+755,-354,-619
+553,889,-390
+"#
+        .trim();
+        let mut abs_points: Vec<Vec3> = r#"
+-618,-824,-621
+-537,-823,-458
+-447,-329,318
+404,-588,-901
+544,-627,-890
+528,-643,409
+-661,-816,-575
+390,-675,-793
+423,-701,434
+-345,-311,381
+459,-707,401
+-485,-357,347
+"#
+        .trim()
+        .lines()
+        .map(|l| l.parse().unwrap())
+        .collect();
+        abs_points.sort();
+        let orientation = [0, 1, 2];
+        let signs = [-1, 1, -1];
+        let distance = Vec3([68, -1246, -43]);
+        let want = Match {
+            distance,
+            abs_points,
+            orientation,
+            signs,
+        };
+
+        let scanners = parse(input)?;
+        let mut got = find_overlap(&scanners[0], &scanners[1]).unwrap();
+        got.abs_points.sort();
+        assert_eq!(want, got);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+--- scanner 0 ---
+404,-588,-901
+528,-643,409
+-838,591,734
+390,-675,-793
+-537,-823,-458
+-485,-357,347
+-345,-311,381
+-661,-816,-575
+-876,649,763
+-618,-824,-621
+553,345,-567
+474,580,667
+-447,-329,318
+-584,868,-557
+544,-627,-890
+564,392,-477
+455,729,728
+-892,524,684
+-689,845,-530
+423,-701,434
+7,-33,-71
+630,319,-379
+443,580,662
+-789,900,-551
+459,-707,401
+
+--- scanner 1 ---
+686,422,578
+605,423,415
+515,917,-361
+-336,658,858
+95,138,22
+-476,619,847
+-340,-569,-846
+567,-361,727
+-460,603,-452
+669,-402,600
+729,430,532
+-500,-761,534
+-322,571,750
+-466,-666,-811
+-429,-592,574
+-355,545,-477
+703,-491,-529
+-328,-685,520
+413,935,-424
+-391,539,-444
+586,-435,557
+-364,-763,-893
+807,-499,-711
+755,-354,-619
+553,889,-390
+
+--- scanner 2 ---
+649,640,665
+682,-795,504
+-784,533,-524
+-644,584,-595
+-588,-843,648
+-30,6,44
+-674,560,763
+500,723,-460
+609,671,-379
+-555,-800,653
+-675,-892,-343
+697,-426,-610
+578,704,681
+493,664,-388
+-671,-858,530
+-667,343,800
+571,-461,-707
+-138,-166,112
+-889,563,-600
+646,-828,498
+640,759,510
+-630,509,768
+-681,-892,-333
+673,-379,-804
+-742,-814,-386
+577,-820,562
+
+--- scanner 3 ---
+-589,542,597
+605,-692,669
+-500,565,-823
+-660,373,557
+-458,-679,-417
+-488,449,543
+-626,468,-788
+338,-750,-386
+528,-832,-391
+562,-778,733
+-938,-730,414
+543,643,-506
+-524,371,-870
+407,773,750
+-104,29,83
+378,-903,-323
+-778,-728,485
+426,699,580
+-438,-605,-362
+-469,-447,-387
+509,732,623
+647,635,-688
+-868,-804,481
+614,-800,639
+595,780,-596
+
+--- scanner 4 ---
+727,592,562
+-293,-554,779
+441,611,-461
+-714,465,-776
+-743,427,-804
+-660,-479,-426
+832,-632,460
+927,-485,-438
+408,393,-506
+466,436,-512
+110,16,151
+-258,-428,682
+-393,719,612
+-211,-452,876
+808,-476,-593
+-575,615,604
+-485,667,467
+-680,325,-822
+-627,-443,-432
+872,-547,-609
+833,512,582
+807,604,487
+839,-516,451
+891,-625,532
+-652,-548,-490
+30,-46,-14
+"#
+        .trim();
+        assert_eq!(part1(input)?, 79);
+        Ok(())
+    }
+
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+    let input = r#"
+    "#
+    .trim();
+    assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

2021/src/day2.rs

@@ -0,0 +1,125 @@
+//! --- Day 2: Dive! ---
+//! Now, you need to figure out how to pilot this thing.
+//!
+//! It seems like the submarine can take a series of commands like forward 1, down 2, or up 3:
+//!
+//! forward X increases the horizontal position by X units.
+//! down X increases the depth by X units.
+//! up X decreases the depth by X units.
+//! Note that since you're on a submarine, down and up affect your depth, and so they have the opposite result of what you might expect.
+//!
+//! The submarine seems to already have a planned course (your puzzle input). You should probably figure out where it's going. For example:
+//!
+//! forward 5
+//! down 5
+//! forward 8
+//! up 3
+//! down 8
+//! forward 2
+//! Your horizontal position and depth both start at 0. The steps above would then modify them as follows:
+//!
+//! forward 5 adds 5 to your horizontal position, a total of 5.
+//! down 5 adds 5 to your depth, resulting in a value of 5.
+//! forward 8 adds 8 to your horizontal position, a total of 13.
+//! up 3 decreases your depth by 3, resulting in a value of 2.
+//! down 8 adds 8 to your depth, resulting in a value of 10.
+//! forward 2 adds 2 to your horizontal position, a total of 15.
+//! After following these instructions, you would have a horizontal position of 15 and a depth of 10. (Multiplying these together produces 150.)
+//!
+//! Calculate the horizontal position and depth you would have after following the planned course. What do you get if you multiply your final horizontal position by your final depth?
+//!
+//! --- Part Two ---
+//! Based on your calculations, the planned course doesn't seem to make any sense. You find the submarine manual and discover that the process is actually slightly more complicated.
+//!
+//! In addition to horizontal position and depth, you'll also need to track a third value, aim, which also starts at 0. The commands also mean something entirely different than you first thought:
+//!
+//! down X increases your aim by X units.
+//! up X decreases your aim by X units.
+//! forward X does two things:
+//! It increases your horizontal position by X units.
+//! It increases your depth by your aim multiplied by X.
+//! Again note that since you're on a submarine, down and up do the opposite of what you might expect: "down" means aiming in the positive direction.
+//!
+//! Now, the above example does something different:
+//!
+//! forward 5 adds 5 to your horizontal position, a total of 5. Because your aim is 0, your depth does not change.
+//! down 5 adds 5 to your aim, resulting in a value of 5.
+//! forward 8 adds 8 to your horizontal position, a total of 13. Because your aim is 5, your depth increases by 8*5=40.
+//! up 3 decreases your aim by 3, resulting in a value of 2.
+//! down 8 adds 8 to your aim, resulting in a value of 10.
+//! forward 2 adds 2 to your horizontal position, a total of 15. Because your aim is 10, your depth increases by 2*10=20 to a total of 60.
+//! After following these new instructions, you would have a horizontal position of 15 and a depth of 60. (Multiplying these produces 900.)
+//!
+//! Using this new interpretation of the commands, calculate the horizontal position and depth you would have after following the planned course. What do you get if you multiply your final horizontal position by your final depth?
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+#[aoc(day2, part1)]
+fn part1(input: &str) -> Result<i32> {
+    let mut horizontal: i32 = 0;
+    let mut depth: i32 = 0;
+    for l in input.split('\n') {
+        let p: Vec<_> = l.split(' ').collect();
+
+        match p[0] {
+            "forward" => horizontal += p[1].parse::<i32>()?,
+            "up" => depth -= p[1].parse::<i32>()?,
+            "down" => depth += p[1].parse::<i32>()?,
+            _ => panic!("unknown command {}", p[0]),
+        }
+    }
+    Ok(horizontal * depth)
+}
+
+#[aoc(day2, part2)]
+fn part2(input: &str) -> Result<i32> {
+    let mut horizontal: i32 = 0;
+    let mut depth: i32 = 0;
+    let mut aim: i32 = 0;
+    for l in input.split('\n') {
+        let p: Vec<_> = l.split(' ').collect();
+
+        match p[0] {
+            "forward" => {
+                let v = p[1].parse::<i32>()?;
+                horizontal += v;
+                depth += v * aim;
+            }
+            "up" => aim -= p[1].parse::<i32>()?,
+            "down" => aim += p[1].parse::<i32>()?,
+            _ => panic!("unknown command {}", p[0]),
+        }
+    }
+    Ok(horizontal * depth)
+}
+
+#[test]
+fn test_part1() -> Result<()> {
+    let input = r#"
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
+"#
+    .trim();
+    assert_eq!(part1(input)?, 150);
+    Ok(())
+}
+
+#[test]
+fn test_part2() -> Result<()> {
+    let input = r#"
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
+"#
+    .trim();
+    assert_eq!(part2(input)?, 900);
+    Ok(())
+}

2021/src/day20.rs

@@ -0,0 +1,199 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+use std::ops::RangeInclusive;
+
+struct Image(HashSet<(isize, isize)>);
+
+impl Image {
+    fn new(input: &str) -> Image {
+        let rows: Vec<_> = input.lines().collect();
+        let width = rows[0].len();
+        Image(
+            rows.iter()
+                .flat_map(|row| row.as_bytes().iter())
+                .enumerate()
+                .filter(|(_i, b)| *b == &b'#')
+                .map(|(i, _b)| ((i % width) as isize, (i / width) as isize))
+                .collect(),
+        )
+    }
+    fn lookup(
+        &self,
+        x: isize,
+        y: isize,
+        algo: &[bool],
+        odd: bool,
+        x_rng: &RangeInclusive<isize>,
+        y_rng: &RangeInclusive<isize>,
+    ) -> usize {
+        assert_eq!(algo.len(), 512);
+        let mut idx = 0;
+        for y_off in -1..=1 {
+            for x_off in -1..=1 {
+                let x_idx = x + x_off;
+                let y_idx = y + y_off;
+                let out_of_bounds = !(x_rng.contains(&x_idx) && y_rng.contains(&y_idx));
+                let val = if (odd && out_of_bounds && algo[0]) || self.0.contains(&(x_idx, y_idx)) {
+                    1
+                } else {
+                    0
+                };
+                idx <<= 1;
+                idx |= val;
+            }
+        }
+        idx
+    }
+    fn extents(&self) -> (isize, isize, isize, isize) {
+        self.0.iter().fold(
+            (isize::MAX, isize::MIN, isize::MAX, isize::MIN),
+            |(min_x, max_x, min_y, max_y), (x, y)| {
+                (min_x.min(*x), max_x.max(*x), min_y.min(*y), max_y.max(*y))
+            },
+        )
+    }
+
+    fn enhance(&self, algo: &[bool], odd: bool) -> Image {
+        let (min_x, max_x, min_y, max_y) = self.extents();
+        let x_rng = min_x..=max_x;
+        let y_rng = min_y..=max_y;
+        let mut new_im = HashSet::new();
+        for y in min_y - 1..=max_y + 1 {
+            for x in min_x - 1..=max_x + 1 {
+                let idx = self.lookup(x, y, algo, odd, &x_rng, &y_rng);
+                if algo[idx] {
+                    new_im.insert((x, y));
+                }
+            }
+        }
+        Image(new_im)
+    }
+
+    fn lights(&self) -> usize {
+        self.0.len()
+    }
+    fn crop(&self, min_x: isize, max_x: isize, min_y: isize, max_y: isize) -> Image {
+        let x_rng = min_x..=max_x;
+        let y_rng = min_y..=max_y;
+        Image(
+            self.0
+                .iter()
+                .filter(|(x, y)| x_rng.contains(x) && y_rng.contains(y))
+                .cloned()
+                .collect(),
+        )
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        let (min_x, max_x, min_y, max_y) = self.extents();
+        writeln!(f, "({}..{})x({}..{})", min_x, max_x, min_y, max_y)?;
+        for y in min_y..=max_y {
+            for x in min_x..=max_x {
+                if self.0.contains(&(x, y)) {
+                    write!(f, "#")?;
+                } else {
+                    write!(f, ".")?;
+                }
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+fn process(im: Image, algo: &[bool], num_steps: isize) -> Image {
+    let mut im = im;
+    for step in 0..num_steps {
+        let (min_x, max_x, min_y, max_y) = im.extents();
+        im = im.enhance(algo, step % 2 == 1);
+        im = im.crop(min_x - 1, max_x + 1, min_y - 1, max_y + 1)
+    }
+    im
+}
+
+#[aoc(day20, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let (algo, im) = input.split_once("\n\n").unwrap();
+    let im = Image::new(im);
+    let algo: Vec<bool> = algo.as_bytes().iter().map(|c| c == &b'#').collect();
+    let im = process(im, &algo, 2);
+
+    dbg!(&im, im.lights());
+    let answer = im.lights();
+    assert!(answer == 5268 || answer == 35);
+    Ok(answer)
+}
+
+#[aoc(day20, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let (algo, im) = input.split_once("\n\n").unwrap();
+    let im = Image::new(im);
+    let algo: Vec<bool> = algo.as_bytes().iter().map(|c| c == &b'#').collect();
+    let im = process(im, &algo, 50);
+
+    dbg!(&im, im.lights());
+    let answer = im.lights();
+    assert!(answer < 19245);
+    Ok(answer)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn lookup() -> Result<()> {
+        let input = r#"
+..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
+
+#..#.
+#....
+##..#
+..#..
+..###
+"#
+.trim();
+        let (algo, im) = input.split_once("\n\n").unwrap();
+        let im = Image::new(im);
+        let algo: Vec<bool> = algo.as_bytes().iter().map(|c| c == &b'#').collect();
+        let (min_x, max_x, min_y, max_y) = im.extents();
+        assert_eq!(
+            im.lookup(2, 2, &algo, false, &(min_x..=max_x), &(min_y..=max_y)),
+            34,
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
+
+#..#.
+#....
+##..#
+..#..
+..###
+"#
+.trim();
+        assert_eq!(part1(input)?, 35);
+        Ok(())
+    }
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
+
+#..#.
+#....
+##..#
+..#..
+..###
+"#
+.trim();
+        assert_eq!(part2(input)?, 3351);
+        Ok(())
+    }
+}

2021/src/day21.rs

@@ -0,0 +1,171 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+#[derive(Copy, Clone, Debug)]
+struct Player {
+    tally: usize,
+    score: usize,
+}
+
+impl Player {
+    fn space(&self) -> usize {
+        (self.tally % 10) + 1
+    }
+}
+
+#[derive(Debug, Default)]
+struct Die {
+    roll_count: usize,
+}
+
+impl Die {
+    fn roll(&mut self) -> usize {
+        let val = (self.roll_count % 100) + 1;
+        self.roll_count += 1;
+        val
+    }
+}
+
+fn take_turn(p: &mut Player, die: &mut Die) -> bool {
+    p.tally += die.roll() + die.roll() + die.roll();
+    p.score += p.space();
+
+    if p.score >= 1000 {
+        return true;
+    }
+    false
+}
+
+#[aoc(day21, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let mut p: Vec<_> = input
+        .lines()
+        .map(|l| l.split_once(": ").unwrap())
+        .map(|(_, space)| space.parse().expect("couldn't parse starting spaceition"))
+        .map(|space: usize| Player {
+            tally: space - 1,
+            score: 0,
+        })
+        .collect();
+    let mut die = Die::default();
+    loop {
+        if take_turn(&mut p[0], &mut die) {
+            return Ok(die.roll_count * p[1].score);
+        }
+        //println!( "Player 1 space {} for a total score of {}.", p[0].space(), p[0].score);
+
+        if take_turn(&mut p[1], &mut die) {
+            return Ok(die.roll_count * p[0].score);
+        }
+        //println!( "Player 2 space {} for a total score of {}.", p[1].space(), p[1].score);
+    }
+}
+
+fn play_part2(p1: Player, p2: Player) -> (usize, usize) {
+    fn play_part2_rec(
+        mut p1: Player,
+        mut p2: Player,
+        r1: usize,
+        r2: usize,
+        r3: usize,
+        r4: usize,
+        r5: usize,
+        r6: usize,
+    ) -> (usize, usize) {
+        //println!( "p1 {} {} p2 {} {} die {} {} {} {} {} {}", p1.score, p1.space(), p2.score, p2.space(), r1, r2, r3, r4, r5, r6,);
+        p1.tally += r1 + r2 + r3;
+        p1.score += p1.space();
+        if p1.score >= 21 {
+            return (1, 0);
+        }
+
+        p2.tally += r4 + r5 + r6;
+        p2.score += p2.space();
+        if p2.score >= 21 {
+            return (0, 1);
+        }
+
+        let mut p1_score = 0;
+        let mut p2_score = 0;
+
+        for i in [1, 2, 3] {
+            for j in [1, 2, 3] {
+                for k in [1, 2, 3] {
+                    for x in [1, 2, 3] {
+                        for y in [1, 2, 3] {
+                            for z in [1, 2, 3] {
+                                let (p1s, p2s) = play_part2_rec(p1, p2, i, j, k, x, y, z);
+                                p1_score += p1s;
+                                p2_score += p2s;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        (p1_score, p2_score)
+    }
+
+    let mut p1_score = 0;
+    let mut p2_score = 0;
+
+    for i in [1, 2, 3] {
+        for j in [1, 2, 3] {
+            for k in [1, 2, 3] {
+                for x in [1, 2, 3] {
+                    for y in [1, 2, 3] {
+                        for z in [1, 2, 3] {
+                            let (p1s, p2s) = play_part2_rec(p1, p2, i, j, k, x, y, z);
+                            p1_score += p1s;
+                            p2_score += p2s;
+                            println!("Running score {} vs {}", p1_score, p2_score);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    (p1_score, p2_score)
+}
+
+//#[aoc(day21, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let p: Vec<_> = input
+        .lines()
+        .map(|l| l.split_once(": ").unwrap())
+        .map(|(_, space)| space.parse().expect("couldn't parse starting spaceition"))
+        .map(|space: usize| Player {
+            tally: space - 1,
+            score: 0,
+        })
+        .collect();
+    let (p1_wins, p2_wins) = play_part2(p[0], p[1]);
+    Ok(if p1_wins > p2_wins { p1_wins } else { p2_wins })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+Player 1 starting position: 4
+Player 2 starting position: 8
+"#
+        .trim();
+        assert_eq!(part1(input)?, 739785);
+        Ok(())
+    }
+
+    //#[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+Player 1 starting position: 4
+Player 2 starting position: 8
+"#
+        .trim();
+        assert_eq!(part2(input)?, 444356092776315);
+        Ok(())
+    }
+}

2021/src/day22.rs

@@ -0,0 +1,214 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+#[derive(Debug)]
+struct Instruction {
+    on: bool,
+    x_rng: RangeInclusive<i64>,
+    y_rng: RangeInclusive<i64>,
+    z_rng: RangeInclusive<i64>,
+}
+
+impl FromStr for Instruction {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Instruction, Infallible> {
+        // on x=11..13,y=11..13,z=11..13
+        // off x=9..11,y=9..11,z=9..11
+        let (verb, rest) = input.split_once(' ').unwrap();
+        let on = match verb {
+            "on" => true,
+            "off" => false,
+            _ => unreachable!("unexpected instruction type"),
+        };
+
+        let parts: Vec<_> = rest.split(',').collect();
+        let parse_rng = |s: &str| -> RangeInclusive<i64> {
+            s.split_once('=')
+                .unwrap()
+                .1
+                .split_once("..")
+                .map(|(lo, hi)| (lo.parse().unwrap(), hi.parse().unwrap()))
+                .map(|(lo, hi)| lo..=hi)
+                .unwrap()
+        };
+        let x_rng = parse_rng(parts[0]);
+        let y_rng = parse_rng(parts[1]);
+        let z_rng = parse_rng(parts[2]);
+        Ok(Instruction {
+            on,
+            x_rng,
+            y_rng,
+            z_rng,
+        })
+    }
+}
+
+fn part1_apply(insts: Vec<Instruction>) -> usize {
+    let mut grid = HashSet::new();
+    for inst in &insts {
+        dbg!(&inst);
+        for x in inst.x_rng.clone() {
+            for y in inst.y_rng.clone() {
+                for z in inst.z_rng.clone() {
+                    if inst.on {
+                        grid.insert((x, y, z));
+                    } else {
+                        grid.remove(&(x, y, z));
+                    }
+                }
+            }
+        }
+    }
+    grid.len()
+}
+
+fn inbounds(r: &RangeInclusive<i64>) -> bool {
+    // lazy but good enough for part1
+    r.start().abs() <= 50
+}
+
+#[aoc(day22, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let insts: Vec<Instruction> = input
+        .lines()
+        .map(|l| l.parse().expect("failed to parse instruction"))
+        .filter(|i: &Instruction| inbounds(&i.x_rng) && inbounds(&i.y_rng) && inbounds(&i.z_rng))
+        .collect();
+    dbg!(&insts);
+    Ok(part1_apply(insts))
+}
+
+//#[aoc(day22, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let insts: Vec<Instruction> = input
+        .lines()
+        .map(|l| l.parse().expect("failed to parse instruction"))
+        .collect();
+    dbg!(&insts);
+    for i in insts {
+        if i.x_rng.end()
+            - i.x_rng.start() * i.y_rng.end()
+            - i.y_rng.start() * i.z_rng.end()
+            - i.z_rng.start()
+            == 2758514936282235
+        {
+            println!("magic instructions {:?}", i)
+        }
+    }
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+        on x=10..12,y=10..12,z=10..12
+on x=11..13,y=11..13,z=11..13
+off x=9..11,y=9..11,z=9..11
+on x=10..10,y=10..10,z=10..10
+"#
+        .trim();
+        assert_eq!(part1(input)?, 39);
+
+        let input = r#"
+        on x=-20..26,y=-36..17,z=-47..7
+on x=-20..33,y=-21..23,z=-26..28
+on x=-22..28,y=-29..23,z=-38..16
+on x=-46..7,y=-6..46,z=-50..-1
+on x=-49..1,y=-3..46,z=-24..28
+on x=2..47,y=-22..22,z=-23..27
+on x=-27..23,y=-28..26,z=-21..29
+on x=-39..5,y=-6..47,z=-3..44
+on x=-30..21,y=-8..43,z=-13..34
+on x=-22..26,y=-27..20,z=-29..19
+off x=-48..-32,y=26..41,z=-47..-37
+on x=-12..35,y=6..50,z=-50..-2
+off x=-48..-32,y=-32..-16,z=-15..-5
+on x=-18..26,y=-33..15,z=-7..46
+off x=-40..-22,y=-38..-28,z=23..41
+on x=-16..35,y=-41..10,z=-47..6
+off x=-32..-23,y=11..30,z=-14..3
+on x=-49..-5,y=-3..45,z=-29..18
+off x=18..30,y=-20..-8,z=-3..13
+on x=-41..9,y=-7..43,z=-33..15
+on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
+on x=967..23432,y=45373..81175,z=27513..53682
+"#
+        .trim();
+        assert_eq!(part1(input)?, 590784);
+        Ok(())
+    }
+
+    //#[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+    on x=-5..47,y=-31..22,z=-19..33
+on x=-44..5,y=-27..21,z=-14..35
+on x=-49..-1,y=-11..42,z=-10..38
+on x=-20..34,y=-40..6,z=-44..1
+off x=26..39,y=40..50,z=-2..11
+on x=-41..5,y=-41..6,z=-36..8
+off x=-43..-33,y=-45..-28,z=7..25
+on x=-33..15,y=-32..19,z=-34..11
+off x=35..47,y=-46..-34,z=-11..5
+on x=-14..36,y=-6..44,z=-16..29
+on x=-57795..-6158,y=29564..72030,z=20435..90618
+on x=36731..105352,y=-21140..28532,z=16094..90401
+on x=30999..107136,y=-53464..15513,z=8553..71215
+on x=13528..83982,y=-99403..-27377,z=-24141..23996
+on x=-72682..-12347,y=18159..111354,z=7391..80950
+on x=-1060..80757,y=-65301..-20884,z=-103788..-16709
+on x=-83015..-9461,y=-72160..-8347,z=-81239..-26856
+on x=-52752..22273,y=-49450..9096,z=54442..119054
+on x=-29982..40483,y=-108474..-28371,z=-24328..38471
+on x=-4958..62750,y=40422..118853,z=-7672..65583
+on x=55694..108686,y=-43367..46958,z=-26781..48729
+on x=-98497..-18186,y=-63569..3412,z=1232..88485
+on x=-726..56291,y=-62629..13224,z=18033..85226
+on x=-110886..-34664,y=-81338..-8658,z=8914..63723
+on x=-55829..24974,y=-16897..54165,z=-121762..-28058
+on x=-65152..-11147,y=22489..91432,z=-58782..1780
+on x=-120100..-32970,y=-46592..27473,z=-11695..61039
+on x=-18631..37533,y=-124565..-50804,z=-35667..28308
+on x=-57817..18248,y=49321..117703,z=5745..55881
+on x=14781..98692,y=-1341..70827,z=15753..70151
+on x=-34419..55919,y=-19626..40991,z=39015..114138
+on x=-60785..11593,y=-56135..2999,z=-95368..-26915
+on x=-32178..58085,y=17647..101866,z=-91405..-8878
+on x=-53655..12091,y=50097..105568,z=-75335..-4862
+on x=-111166..-40997,y=-71714..2688,z=5609..50954
+on x=-16602..70118,y=-98693..-44401,z=5197..76897
+on x=16383..101554,y=4615..83635,z=-44907..18747
+off x=-95822..-15171,y=-19987..48940,z=10804..104439
+on x=-89813..-14614,y=16069..88491,z=-3297..45228
+on x=41075..99376,y=-20427..49978,z=-52012..13762
+on x=-21330..50085,y=-17944..62733,z=-112280..-30197
+on x=-16478..35915,y=36008..118594,z=-7885..47086
+off x=-98156..-27851,y=-49952..43171,z=-99005..-8456
+off x=2032..69770,y=-71013..4824,z=7471..94418
+on x=43670..120875,y=-42068..12382,z=-24787..38892
+off x=37514..111226,y=-45862..25743,z=-16714..54663
+off x=25699..97951,y=-30668..59918,z=-15349..69697
+off x=-44271..17935,y=-9516..60759,z=49131..112598
+on x=-61695..-5813,y=40978..94975,z=8655..80240
+off x=-101086..-9439,y=-7088..67543,z=33935..83858
+off x=18020..114017,y=-48931..32606,z=21474..89843
+off x=-77139..10506,y=-89994..-18797,z=-80..59318
+off x=8476..79288,y=-75520..11602,z=-96624..-24783
+on x=-47488..-1262,y=24338..100707,z=16292..72967
+off x=-84341..13987,y=2429..92914,z=-90671..-1318
+off x=-37810..49457,y=-71013..-7894,z=-105357..-13188
+off x=-27365..46395,y=31009..98017,z=15428..76570
+off x=-70369..-16548,y=22648..78696,z=-1892..86821
+on x=-53470..21291,y=-120233..-33476,z=-44150..38147
+off x=-93533..-4276,y=-16170..68771,z=-104985..-24507
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 2758514936282235);
+        Ok(())
+    }
+}

2021/src/day23.rs

@@ -0,0 +1,41 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+#[aoc(day23, part1)]
+fn part1(input: &str) -> Result<usize> {
+    todo!("part1");
+    Ok(0)
+}
+
+/*
+#[aoc(day23, part2)]
+fn part2(input: &str) -> Result<usize> {
+    todo!("part2");
+    Ok(0)
+}
+*/
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+"#
+        .trim();
+        assert_eq!(part1(input)?, usize::MAX);
+        Ok(())
+    }
+
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+        let input = r#"
+    "#
+        .trim();
+        assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

2021/src/day3.rs

@@ -0,0 +1,198 @@
+//! --- Day 3: Binary Diagnostic ---
+//! The submarine has been making some odd creaking noises, so you ask it to produce a diagnostic report just in case.
+//!
+//! The diagnostic report (your puzzle input) consists of a list of binary numbers which, when decoded properly, can tell you many useful things about the conditions of the submarine. The first parameter to check is the power consumption.
+//!
+//! You need to use the binary numbers in the diagnostic report to generate two new binary numbers (called the gamma rate and the epsilon rate). The power consumption can then be found by multiplying the gamma rate by the epsilon rate.
+//!
+//! Each bit in the gamma rate can be determined by finding the most common bit in the corresponding position of all numbers in the diagnostic report. For example, given the following diagnostic report:
+//!
+//! 00100
+//! 11110
+//! 10110
+//! 10111
+//! 10101
+//! 01111
+//! 00111
+//! 11100
+//! 10000
+//! 11001
+//! 00010
+//! 01010
+//! Considering only the first bit of each number, there are five 0 bits and seven 1 bits. Since the most common bit is 1, the first bit of the gamma rate is 1.
+//!
+//! The most common second bit of the numbers in the diagnostic report is 0, so the second bit of the gamma rate is 0.
+//!
+//! The most common value of the third, fourth, and fifth bits are 1, 1, and 0, respectively, and so the final three bits of the gamma rate are 110.
+//!
+//! So, the gamma rate is the binary number 10110, or 22 in decimal.
+//!
+//! The epsilon rate is calculated in a similar way; rather than use the most common bit, the least common bit from each position is used. So, the epsilon rate is 01001, or 9 in decimal. Multiplying the gamma rate (22) by the epsilon rate (9) produces the power consumption, 198.
+//!
+//! Use the binary numbers in your diagnostic report to calculate the gamma rate and epsilon rate, then multiply them together. What is the power consumption of the submarine? (Be sure to represent your answer in decimal, not binary.)
+//!
+//! --- Part Two ---
+//! Next, you should verify the life support rating, which can be determined by multiplying the oxygen generator rating by the CO2 scrubber rating.
+//!
+//! Both the oxygen generator rating and the CO2 scrubber rating are values that can be found in your diagnostic report - finding them is the tricky part. Both values are located using a similar process that involves filtering out values until only one remains. Before searching for either rating value, start with the full list of binary numbers from your diagnostic report and consider just the first bit of those numbers. Then:
+//!
+//! Keep only numbers selected by the bit criteria for the type of rating value for which you are searching. Discard numbers which do not match the bit criteria.
+//! If you only have one number left, stop; this is the rating value for which you are searching.
+//! Otherwise, repeat the process, considering the next bit to the right.
+//! The bit criteria depends on which type of rating value you want to find:
+//!
+//! To find oxygen generator rating, determine the most common value (0 or 1) in the current bit position, and keep only numbers with that bit in that position. If 0 and 1 are equally common, keep values with a 1 in the position being considered.
+//! To find CO2 scrubber rating, determine the least common value (0 or 1) in the current bit position, and keep only numbers with that bit in that position. If 0 and 1 are equally common, keep values with a 0 in the position being considered.
+//! For example, to determine the oxygen generator rating value using the same example diagnostic report from above:
+//!
+//! Start with all 12 numbers and consider only the first bit of each number. There are more 1 bits (7) than 0 bits (5), so keep only the 7 numbers with a 1 in the first position: 11110, 10110, 10111, 10101, 11100, 10000, and 11001.
+//! Then, consider the second bit of the 7 remaining numbers: there are more 0 bits (4) than 1 bits (3), so keep only the 4 numbers with a 0 in the second position: 10110, 10111, 10101, and 10000.
+//! In the third position, three of the four numbers have a 1, so keep those three: 10110, 10111, and 10101.
+//! In the fourth position, two of the three numbers have a 1, so keep those two: 10110 and 10111.
+//! In the fifth position, there are an equal number of 0 bits and 1 bits (one each). So, to find the oxygen generator rating, keep the number with a 1 in that position: 10111.
+//! As there is only one number left, stop; the oxygen generator rating is 10111, or 23 in decimal.
+//! Then, to determine the CO2 scrubber rating value from the same example above:
+//!
+//! Start again with all 12 numbers and consider only the first bit of each number. There are fewer 0 bits (5) than 1 bits (7), so keep only the 5 numbers with a 0 in the first position: 00100, 01111, 00111, 00010, and 01010.
+//! Then, consider the second bit of the 5 remaining numbers: there are fewer 1 bits (2) than 0 bits (3), so keep only the 2 numbers with a 1 in the second position: 01111 and 01010.
+//! In the third position, there are an equal number of 0 bits and 1 bits (one each). So, to find the CO2 scrubber rating, keep the number with a 0 in that position: 01010.
+//! As there is only one number left, stop; the CO2 scrubber rating is 01010, or 10 in decimal.
+//! Finally, to find the life support rating, multiply the oxygen generator rating (23) by the CO2 scrubber rating (10) to get 230.
+//!
+//! Use the binary numbers in your diagnostic report to calculate the oxygen generator rating and CO2 scrubber rating, then multiply them together. What is the life support rating of the submarine? (Be sure to represent your answer in decimal, not binary.)
+
+use std::fmt::{Debug, Error, Formatter};
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+#[aoc(day3, part1)]
+fn part1(input: &str) -> Result<u64> {
+    let lines: Vec<_> = input.trim().split('\n').collect();
+    let num_bits = lines[0].len();
+    let majority = lines.len() / 2;
+    let mut bits = vec![0; num_bits];
+    lines.iter().for_each(|l| {
+        for (i, c) in l.chars().enumerate() {
+            if c == '1' {
+                bits[i] += 1;
+            }
+        }
+    });
+    let mut gamma: u64 = 0;
+    for (i, &b) in bits.iter().rev().enumerate() {
+        if b > majority {
+            gamma |= 1 << i;
+        }
+    }
+    let mask = (1 << (num_bits)) - 1;
+    let epsilon = (!gamma) & mask;
+    Ok(epsilon * gamma)
+}
+
+fn oxygen(nums: &[u64], num_bits: usize) -> u64 {
+    partition(nums, num_bits - 1, Partition::Oxygen)
+}
+
+fn co2(nums: &[u64], num_bits: usize) -> u64 {
+    partition(nums, num_bits - 1, Partition::CO2)
+}
+
+#[derive(Copy, Clone, Debug)]
+enum Partition {
+    Oxygen,
+    CO2,
+}
+
+struct Binaries<'a>(&'a [u64]);
+impl<'a> Debug for Binaries<'a> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f, "[")?;
+        for n in self.0.iter() {
+            writeln!(f, "  0b{:08b},", n)?;
+        }
+        writeln!(f, "]")?;
+        Ok(())
+    }
+}
+
+fn partition(nums: &[u64], bit_offset: usize, partition_type: Partition) -> u64 {
+    let (one, zero): (Vec<u64>, Vec<u64>) =
+        nums.iter().partition(|n| (*n & (1 << bit_offset)) != 0);
+
+    let remainder = match partition_type {
+        Partition::Oxygen => {
+            if one.len() >= zero.len() {
+                one
+            } else {
+                zero
+            }
+        }
+        Partition::CO2 => {
+            if one.len() >= zero.len() {
+                zero
+            } else {
+                one
+            }
+        }
+    };
+    if remainder.len() == 1 {
+        return remainder[0];
+    }
+    partition(&remainder, bit_offset - 1, partition_type)
+}
+
+#[aoc(day3, part2)]
+fn part2(input: &str) -> Result<u64> {
+    let lines: Vec<_> = input.trim().split('\n').collect();
+    let nums: Vec<_> = lines
+        .iter()
+        .map(|s| u64::from_str_radix(s, 2))
+        .collect::<Result<_, std::num::ParseIntError>>()?;
+    let num_bits = lines[0].chars().count();
+    let o = oxygen(&nums, num_bits);
+    let c = co2(&nums, num_bits);
+    Ok(o * c)
+}
+
+#[test]
+fn test_part1() -> Result<()> {
+    let input = r#"
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
+"#
+    .trim();
+    assert_eq!(part1(input)?, 198);
+    Ok(())
+}
+
+#[test]
+fn test_part2() -> Result<()> {
+    let input = r#"
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
+"#
+    .trim();
+    assert_eq!(part2(input)?, 230);
+    Ok(())
+}

2021/src/day4.rs

@@ -0,0 +1,369 @@
+//! --- Day 4: Giant Squid ---
+//! You're already almost 1.5km (almost a mile) below the surface of the ocean, already so deep that you can't see any sunlight. What you can see, however, is a giant squid that has attached itself to the outside of your submarine.
+//!
+//! Maybe it wants to play bingo?
+//!
+//! Bingo is played on a set of boards each consisting of a 5x5 grid of numbers. Numbers are chosen at random, and the chosen number is marked on all boards on which it appears. (Numbers may not appear on all boards.) If all numbers in any row or any column of a board are marked, that board wins. (Diagonals don't count.)
+//!
+//! The submarine has a bingo subsystem to help passengers (currently, you and the giant squid) pass the time. It automatically generates a random order in which to draw numbers and a random set of boards (your puzzle input). For example:
+//!
+//! 7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+//!
+//! 22 13 17 11  0
+//!  8  2 23  4 24
+//! 21  9 14 16  7
+//!  6 10  3 18  5
+//!  1 12 20 15 19
+//!
+//!  3 15  0  2 22
+//!  9 18 13 17  5
+//! 19  8  7 25 23
+//! 20 11 10 24  4
+//! 14 21 16 12  6
+//!
+//! 14 21 17 24  4
+//! 10 16 15  9 19
+//! 18  8 23 26 20
+//! 22 11 13  6  5
+//!  2  0 12  3  7
+//! After the first five numbers are drawn (7, 4, 9, 5, and 11), there are no winners, but the boards are marked as follows (shown here adjacent to each other to save space):
+//!
+//! 22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+//!  8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+//! 21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+//!  6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+//!  1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+//! After the next six numbers are drawn (17, 23, 2, 0, 14, and 21), there are still no winners:
+//!
+//! 22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+//!  8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+//! 21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+//!  6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+//!  1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+//! Finally, 24 is drawn:
+//!
+//! 22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+//!  8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+//! 21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+//!  6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+//!  1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+//! At this point, the third board wins because it has at least one complete row or column of marked numbers (in this case, the entire top row is marked: 14 21 17 24 4).
+//!
+//! The score of the winning board can now be calculated. Start by finding the sum of all unmarked numbers on that board; in this case, the sum is 188. Then, multiply that sum by the number that was just called when the board won, 24, to get the final score, 188 * 24 = 4512.
+//!
+//! To guarantee victory against the giant squid, figure out which board will win first. What will your final score be if you choose that board?
+//!
+//! --- Part Two ---
+//! On the other hand, it might be wise to try a different strategy: let the giant squid win.
+//!
+//! You aren't sure how many bingo boards a giant squid could play at once, so rather than waste time counting its arms, the safe thing to do is to figure out which board will win last and choose that one. That way, no matter which boards it picks, it will win for sure.
+//!
+//! In the above example, the second board is the last to win, which happens after 13 is eventually called and its middle column is completely marked. If you were to keep playing until this point, the second board would have a sum of unmarked numbers equal to 148 for a final score of 148 * 13 = 1924.
+//!
+//! Figure out which board will win last. Once it wins, what would its final score be?
+
+use std::{
+    collections::{HashMap, HashSet},
+    fmt::{Debug, Error, Formatter},
+    num::ParseIntError,
+    str::FromStr,
+};
+
+use ansi_term::Color::Green;
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+use thiserror::Error;
+
+#[derive(Debug, Default)]
+struct Game {
+    numbers: Vec<u64>,
+    boards: Vec<Board>,
+    skip_boards: HashSet<usize>,
+}
+
+#[derive(Debug, Error)]
+enum GameError {
+    #[error("couldn't parse number {0}")]
+    ParseIntError(#[from] ParseIntError),
+    #[error("couldn't parse board {0}")]
+    BoardError(#[from] BoardError),
+}
+
+impl Game {
+    // If return not None, it contains a winning board
+    fn apply_number(&mut self, number: u64) -> Option<&Board> {
+        for b in &mut self.boards {
+            b.mark(number);
+            if b.is_bingo() {
+                return Some(b);
+            }
+        }
+        None
+    }
+    // If return not None, it contains a winning board. This will remove winning boards until only
+    // one remains.
+    fn apply_number_part2(&mut self, number: u64) -> Option<&Board> {
+        let num_boards = self.boards.len();
+        for (idx, b) in self.boards.iter_mut().enumerate() {
+            if self.skip_boards.contains(&idx) {
+                continue;
+            }
+            b.mark(number);
+            if b.is_bingo() {
+                self.skip_boards.insert(idx);
+                if self.skip_boards.len() == num_boards {
+                    return Some(b);
+                }
+            }
+        }
+        None
+    }
+}
+
+impl FromStr for Game {
+    type Err = GameError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut it = s.split("\n\n");
+        let numbers = it
+            .next()
+            .unwrap()
+            .split(',')
+            .map(|s| s.parse())
+            .collect::<Result<_, ParseIntError>>()?;
+        let boards: Vec<_> = it.map(|s| s.parse()).collect::<Result<_, BoardError>>()?;
+        Ok(Game {
+            numbers,
+            boards,
+            skip_boards: Default::default(),
+        })
+    }
+}
+
+#[derive(Default)]
+struct MarkerBoard(u32);
+
+impl MarkerBoard {
+    fn mark(&mut self, (x, y): (usize, usize)) {
+        let bit = 1 << (x + y * 5);
+        self.0 |= bit;
+    }
+
+    fn is_marked(&self, (x, y): (usize, usize)) -> bool {
+        let bit = 1 << (x + y * 5);
+        (self.0 & bit) != 0
+    }
+
+    fn is_bingo(&self) -> bool {
+        let h = 0b11111;
+        #[allow(clippy::unusual_byte_groupings)]
+        let v = 0b00001_00001_00001_00001_00001;
+        let m = self.0;
+
+        // Bingo horizontally
+        (m & h == h)
+            || ((m >> 5 & h) == h)
+            || ((m >> 10 & h) == h)
+            || ((m >> 15 & h) == h)
+            || ((m >> 20 & h) == h)
+        // Bingo vertically
+            || ((m & v) == v)
+            || ((m >> 1 & v) == v)
+            || ((m >> 2 & v) == v)
+            || ((m >> 3 & v) == v)
+            || ((m >> 4 & v) == v)
+    }
+}
+
+#[derive(Default)]
+struct Board {
+    numbers: HashMap<(usize, usize), u64>,
+    marked: MarkerBoard,
+}
+
+#[derive(Debug, Error)]
+enum BoardError {
+    #[error("couldn't parse number {0}")]
+    ParseIntError(#[from] ParseIntError),
+}
+
+impl Board {
+    fn is_bingo(&self) -> bool {
+        self.marked.is_bingo()
+    }
+    fn sum_uncovered(&self) -> u64 {
+        self.numbers
+            .iter()
+            .map(|((x, y), v)| {
+                if !self.marked.is_marked((*x, *y)) {
+                    *v
+                } else {
+                    0
+                }
+            })
+            .sum()
+    }
+    // Returns true if board has num.
+    fn mark(&mut self, num: u64) -> bool {
+        for ((x, y), v) in self.numbers.iter() {
+            if *v == num {
+                self.marked.mark((*x, *y));
+                return true;
+            }
+        }
+        false
+    }
+}
+
+impl Debug for Board {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f)?;
+        for y in 0..5 {
+            for x in 0..5 {
+                if self.marked.is_marked((x, y)) {
+                    let v = format!("{:3}", self.numbers[&(x, y)]);
+                    write!(f, "{}", Green.bold().paint(v))?;
+                } else {
+                    write!(f, "{:3}", self.numbers[&(x, y)])?;
+                }
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl FromStr for Board {
+    type Err = BoardError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let numbers: Vec<Vec<_>> = s
+            .split('\n')
+            .map(|l| {
+                l.split(' ')
+                    // Remove the double space that happens before single digit cells.
+                    .filter(|c| !c.is_empty())
+                    .map(|c| c.parse())
+                    .collect::<Result<_, ParseIntError>>()
+            })
+            .collect::<Result<_, ParseIntError>>()?;
+        let numbers: HashMap<_, _> = numbers
+            .iter()
+            .enumerate()
+            .flat_map(|(y, row)| row.iter().enumerate().map(move |(x, c)| ((x, y), *c)))
+            .collect();
+        Ok(Board {
+            numbers,
+            marked: Default::default(),
+        })
+    }
+}
+
+#[aoc(day4, part1)]
+fn part1(input: &str) -> Result<u64> {
+    let mut g: Game = input.parse()?;
+    let numbers = g.numbers.clone();
+    for n in numbers {
+        if let Some(b) = g.apply_number(n) {
+            //println!("winning board {:?}", b);
+            return Ok(n as u64 * b.sum_uncovered());
+        }
+    }
+    unreachable!("We should have had a winner by now");
+}
+
+#[aoc(day4, part2)]
+fn part2(input: &str) -> Result<u64> {
+    let mut g: Game = input.parse()?;
+    let numbers = g.numbers.clone();
+    for n in numbers {
+        if let Some(b) = g.apply_number_part2(n) {
+            //println!("winning board {:?}", b);
+            return Ok(n as u64 * b.sum_uncovered());
+        }
+    }
+    unreachable!("We should have had a winner by now");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_board() -> Result<()> {
+        let input = r#"
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
+ "#
+        .trim();
+        let mut b = Board::from_str(input)?;
+        assert!(!b.is_bingo());
+        assert!(!b.mark(100));
+
+        for num in &[7, 4, 9, 5, 11, 17, 23, 2, 0, 14, 21, 24] {
+            assert!(b.mark(*num));
+        }
+        assert!(b.is_bingo());
+        assert_eq!(b.sum_uncovered(), 188);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
+ "#
+        .trim();
+        assert_eq!(part1(input)?, 4512);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
+ "#
+        .trim();
+        assert_eq!(part2(input)?, 1924);
+        Ok(())
+    }
+}

2021/src/day5.rs

@@ -0,0 +1,309 @@
+//!
+//! --- Day 5: Hydrothermal Venture ---
+//! You come across a field of hydrothermal vents on the ocean floor! These vents constantly produce large, opaque clouds, so it would be best to avoid them if possible.
+//!
+//! They tend to form in lines; the submarine helpfully produces a list of nearby lines of vents (your puzzle input) for you to review. For example:
+//!
+//! 0,9 -> 5,9
+//! 8,0 -> 0,8
+//! 9,4 -> 3,4
+//! 2,2 -> 2,1
+//! 7,0 -> 7,4
+//! 6,4 -> 2,0
+//! 0,9 -> 2,9
+//! 3,4 -> 1,4
+//! 0,0 -> 8,8
+//! 5,5 -> 8,2
+//! Each line of vents is given as a line segment in the format x1,y1 -> x2,y2 where x1,y1 are the coordinates of one end the line segment and x2,y2 are the coordinates of the other end. These line segments include the points at both ends. In other words:
+//!
+//! An entry like 1,1 -> 1,3 covers points 1,1, 1,2, and 1,3.
+//! An entry like 9,7 -> 7,7 covers points 9,7, 8,7, and 7,7.
+//! For now, only consider horizontal and vertical lines: lines where either x1 = x2 or y1 = y2.
+//!
+//! So, the horizontal and vertical lines from the above list would produce the following diagram:
+//!
+//! .......1..
+//! ..1....1..
+//! ..1....1..
+//! .......1..
+//! .112111211
+//! ..........
+//! ..........
+//! ..........
+//! ..........
+//! 222111....
+//! In this diagram, the top left corner is 0,0 and the bottom right corner is 9,9. Each position is shown as the number of lines which cover that point or . if no line covers that point. The top-left pair of 1s, for example, comes from 2,2 -> 2,1; the very bottom row is formed by the overlapping lines 0,9 -> 5,9 and 0,9 -> 2,9.
+//!
+//! To avoid the most dangerous areas, you need to determine the number of points where at least two lines overlap. In the above example, this is anywhere in the diagram with a 2 or larger - a total of 5 points.
+//!
+//! Consider only horizontal and vertical lines. At how many points do at least two lines overlap?
+//!
+//! --- Part Two ---
+//! Unfortunately, considering only horizontal and vertical lines doesn't give you the full picture; you need to also consider diagonal lines.
+//!
+//! Because of the limits of the hydrothermal vent mapping system, the lines in your list will only ever be horizontal, vertical, or a diagonal line at exactly 45 degrees. In other words:
+//!
+//! An entry like 1,1 -> 3,3 covers points 1,1, 2,2, and 3,3.
+//! An entry like 9,7 -> 7,9 covers points 9,7, 8,8, and 7,9.
+//! Considering all lines from the above example would now produce the following diagram:
+//!
+//! 1.1....11.
+//! .111...2..
+//! ..2.1.111.
+//! ...1.2.2..
+//! .112313211
+//! ...1.2....
+//! ..1...1...
+//! .1.....1..
+//! 1.......1.
+//! 222111....
+//! You still need to determine the number of points where at least two lines overlap. In the above example, this is still anywhere in the diagram with a 2 or larger - now a total of 12 points.
+//!
+//! Consider all of the lines. At how many points do at least two lines overlap?
+
+use std::{
+    fmt::{Debug, Error, Formatter},
+    num::ParseIntError,
+    ops::{Index, IndexMut},
+    str::FromStr,
+};
+
+use anyhow::Result;
+use aoc_runner_derive::{aoc, aoc_generator};
+use thiserror::Error;
+
+#[derive(Debug)]
+struct Point {
+    x: i32,
+    y: i32,
+}
+
+struct Line {
+    p0: Point,
+    p1: Point,
+}
+
+#[derive(Debug, Error)]
+enum LineError {
+    #[error("couldn't parse number {0}")]
+    ParseIntError(#[from] ParseIntError),
+    #[error("input truncated")]
+    PrematureEOL,
+}
+
+impl Debug for Line {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(
+            f,
+            "{},{} -> {},{}",
+            self.p0.x, self.p0.y, self.p1.x, self.p1.y,
+        )
+    }
+}
+
+impl FromStr for Line {
+    type Err = LineError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut it = s.split(' ');
+        let parse_point = |it: &mut dyn Iterator<Item = &str>| -> Result<Point, LineError> {
+            let p = it.next().ok_or(LineError::PrematureEOL)?;
+            let nums: Vec<_> = p
+                .split(',')
+                .map(|n| n.parse())
+                .collect::<Result<_, ParseIntError>>()?;
+            Ok(Point {
+                x: nums[0],
+                y: nums[1],
+            })
+        };
+        let p0 = parse_point(&mut it)?;
+        let _ = it.next().ok_or(LineError::PrematureEOL)?;
+        let p1 = parse_point(&mut it)?;
+        Ok(Line { p0, p1 })
+    }
+}
+
+struct Image {
+    width: usize,
+    height: usize,
+    pixels: Vec<u32>,
+}
+
+impl Image {
+    fn new(width: usize, height: usize) -> Image {
+        Image {
+            width,
+            height,
+            pixels: vec![0; width * height],
+        }
+    }
+    fn answer(&self) -> u32 {
+        self.pixels.iter().filter(|&v| *v > 1).count() as u32
+    }
+}
+
+impl Index<(usize, usize)> for Image {
+    type Output = u32;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+impl IndexMut<(usize, usize)> for Image {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        &mut self.pixels[x + y * self.width]
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f, "({}, {})", self.width, self.height)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                let v = self[(x, y)];
+                if v == 0 {
+                    write!(f, ".")?;
+                } else {
+                    write!(f, "{}", v)?;
+                }
+            }
+            writeln!(f)?;
+        }
+        writeln!(f)?;
+        Ok(())
+    }
+}
+
+#[aoc_generator(day5)]
+fn parse(input: &str) -> Result<Vec<Line>> {
+    Ok(input
+        .split('\n')
+        .map(|l| l.parse())
+        .collect::<Result<_, LineError>>()?)
+}
+
+fn draw(im: &mut Image, l: &Line) {
+    let dx = l.p1.x - l.p0.x;
+    let dy = l.p1.y - l.p0.y;
+
+    if dx == 0 {
+        let x = l.p0.x as usize;
+        let sy = l.p0.y;
+        let ey = l.p1.y;
+        let (sy, ey) = if sy > ey { (ey, sy) } else { (sy, ey) };
+        for y in sy..=ey {
+            im[(x, y as usize)] += 1;
+        }
+    } else if dy == 0 {
+        let y = l.p0.y as usize;
+        let sx = l.p0.x;
+        let ex = l.p1.x;
+        let (sx, ex) = if sx > ex { (ex, sx) } else { (sx, ex) };
+        for x in sx..=ex {
+            im[(x as usize, y)] += 1;
+        }
+    } else {
+        // We only support 45 degree angles.
+        assert_eq!(dx.abs(), dy.abs());
+        let dx = dx / dx.abs();
+        let dy = dy / dy.abs();
+
+        let mut x = l.p0.x;
+        let mut y = l.p0.y;
+        while x != l.p1.x && y != l.p1.y {
+            im[(x as usize, y as usize)] += 1;
+            x += dx;
+            y += dy;
+        }
+        im[(x as usize, y as usize)] += 1;
+    }
+}
+
+#[aoc(day5, part1)]
+fn part1(lines: &[Line]) -> Result<u32> {
+    let width = lines
+        .iter()
+        .map(|l| l.p0.x.max(l.p1.x) as usize)
+        .max()
+        .expect("couldn't find max width")
+        + 1;
+    let height = lines
+        .iter()
+        .map(|l| l.p0.y.max(l.p1.y) as usize)
+        .max()
+        .expect("couldn't find max height")
+        + 1;
+    let mut im = Image::new(width, height);
+    for l in lines
+        .iter()
+        .filter(|l| l.p0.x == l.p1.x || l.p0.y == l.p1.y)
+    {
+        draw(&mut im, l);
+    }
+    Ok(im.answer())
+}
+
+#[aoc(day5, part2)]
+fn part2(lines: &[Line]) -> Result<u32> {
+    let width = lines
+        .iter()
+        .map(|l| l.p0.x.max(l.p1.x) as usize)
+        .max()
+        .expect("couldn't find max width")
+        + 1;
+    let height = lines
+        .iter()
+        .map(|l| l.p0.y.max(l.p1.y) as usize)
+        .max()
+        .expect("couldn't find max height")
+        + 1;
+    let mut im = Image::new(width, height);
+    for l in lines {
+        draw(&mut im, l);
+    }
+    Ok(im.answer())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2
+            "#
+        .trim();
+        assert_eq!(part1(&parse(input)?)?, 5);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2
+    "#
+        .trim();
+        assert_eq!(part2(&parse(input)?)?, 12);
+        Ok(())
+    }
+}

2021/src/day6.rs

@@ -0,0 +1,122 @@
+//! --- Day 6: Lanternfish ---
+//! The sea floor is getting steeper. Maybe the sleigh keys got carried this way?
+//!
+//! A massive school of glowing lanternfish swims past. They must spawn quickly to reach such large numbers - maybe exponentially quickly? You should model their growth rate to be sure.
+//!
+//! Although you know nothing about this specific species of lanternfish, you make some guesses about their attributes. Surely, each lanternfish creates a new lanternfish once every 7 days.
+//!
+//! However, this process isn't necessarily synchronized between every lanternfish - one lanternfish might have 2 days left until it creates another lanternfish, while another might have 4. So, you can model each fish as a single number that represents the number of days until it creates a new lanternfish.
+//!
+//! Furthermore, you reason, a new lanternfish would surely need slightly longer before it's capable of producing more lanternfish: two more days for its first cycle.
+//!
+//! So, suppose you have a lanternfish with an internal timer value of 3:
+//!
+//! After one day, its internal timer would become 2.
+//! After another day, its internal timer would become 1.
+//! After another day, its internal timer would become 0.
+//! After another day, its internal timer would reset to 6, and it would create a new lanternfish with an internal timer of 8.
+//! After another day, the first lanternfish would have an internal timer of 5, and the second lanternfish would have an internal timer of 7.
+//! A lanternfish that creates a new fish resets its timer to 6, not 7 (because 0 is included as a valid timer value). The new lanternfish starts with an internal timer of 8 and does not start counting down until the next day.
+//!
+//! Realizing what you're trying to do, the submarine automatically produces a list of the ages of several hundred nearby lanternfish (your puzzle input). For example, suppose you were given the following list:
+//!
+//! 3,4,3,1,2
+//! This list means that the first fish has an internal timer of 3, the second fish has an internal timer of 4, and so on until the fifth fish, which has an internal timer of 2. Simulating these fish over several days would proceed as follows:
+//!
+//! Initial state: 3,4,3,1,2
+//! After  1 day:  2,3,2,0,1
+//! After  2 days: 1,2,1,6,0,8
+//! After  3 days: 0,1,0,5,6,7,8
+//! After  4 days: 6,0,6,4,5,6,7,8,8
+//! After  5 days: 5,6,5,3,4,5,6,7,7,8
+//! After  6 days: 4,5,4,2,3,4,5,6,6,7
+//! After  7 days: 3,4,3,1,2,3,4,5,5,6
+//! After  8 days: 2,3,2,0,1,2,3,4,4,5
+//! After  9 days: 1,2,1,6,0,1,2,3,3,4,8
+//! After 10 days: 0,1,0,5,6,0,1,2,2,3,7,8
+//! After 11 days: 6,0,6,4,5,6,0,1,1,2,6,7,8,8,8
+//! After 12 days: 5,6,5,3,4,5,6,0,0,1,5,6,7,7,7,8,8
+//! After 13 days: 4,5,4,2,3,4,5,6,6,0,4,5,6,6,6,7,7,8,8
+//! After 14 days: 3,4,3,1,2,3,4,5,5,6,3,4,5,5,5,6,6,7,7,8
+//! After 15 days: 2,3,2,0,1,2,3,4,4,5,2,3,4,4,4,5,5,6,6,7
+//! After 16 days: 1,2,1,6,0,1,2,3,3,4,1,2,3,3,3,4,4,5,5,6,8
+//! After 17 days: 0,1,0,5,6,0,1,2,2,3,0,1,2,2,2,3,3,4,4,5,7,8
+//! After 18 days: 6,0,6,4,5,6,0,1,1,2,6,0,1,1,1,2,2,3,3,4,6,7,8,8,8,8
+//! Each day, a 0 becomes a 6 and adds a new 8 to the end of the list, while each other number decreases by 1 if it was present at the start of the day.
+//!
+//! In this example, after 18 days, there are a total of 26 fish. After 80 days, there would be a total of 5934.
+//!
+//! Find a way to simulate lanternfish. How many lanternfish would there be after 80 days?
+//!
+//! --- Part Two ---
+//! Suppose the lanternfish live forever and have unlimited food and space. Would they take over the entire ocean?
+//!
+//! After 256 days in the example above, there would be a total of 26984457539 lanternfish!
+
+use std::num::ParseIntError;
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+#[aoc(day6, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let mut fish = input
+        .split(',')
+        .map(|s| s.parse())
+        .collect::<Result<Vec<u64>, ParseIntError>>()?;
+    for _ in 0..80 {
+        let mut new_fish = Vec::new();
+        for f in fish.iter_mut() {
+            if *f == 0 {
+                new_fish.push(8);
+                *f = 7;
+            }
+            *f -= 1;
+        }
+        fish.extend(new_fish);
+    }
+    Ok(fish.len())
+}
+
+#[aoc(day6, part2)]
+fn part2(input: &str) -> Result<usize> {
+    let mut counts = [0; 9];
+    input
+        .split(',')
+        .map(|s| s.parse())
+        .collect::<Result<Vec<usize>, ParseIntError>>()?
+        .into_iter()
+        .for_each(|n| counts[n] += 1);
+    for _ in 0..256 {
+        let mut tmp = [0; 9];
+        for (i, c) in counts.iter().enumerate() {
+            if i == 0 {
+                tmp[6] = *c;
+                tmp[8] = *c;
+            } else {
+                tmp[i - 1] += *c;
+            }
+        }
+        counts = tmp;
+    }
+    Ok(counts.iter().sum())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"3,4,3,1,2"#.trim();
+        assert_eq!(part1(input)?, 5934);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"3,4,3,1,2"#.trim();
+        assert_eq!(part2(input)?, 26984457539);
+        Ok(())
+    }
+}

2021/src/day7.rs

@@ -0,0 +1,140 @@
+//! --- Day 7: The Treachery of Whales ---
+//! A giant whale has decided your submarine is its next meal, and it's much faster than you are. There's nowhere to run!
+//!
+//! Suddenly, a swarm of crabs (each in its own tiny submarine - it's too deep for them otherwise) zooms in to rescue you! They seem to be preparing to blast a hole in the ocean floor; sensors indicate a massive underground cave system just beyond where they're aiming!
+//!
+//! The crab submarines all need to be aligned before they'll have enough power to blast a large enough hole for your submarine to get through. However, it doesn't look like they'll be aligned before the whale catches you! Maybe you can help?
+//!
+//! There's one major catch - crab submarines can only move horizontally.
+//!
+//! You quickly make a list of the horizontal position of each crab (your puzzle input). Crab submarines have limited fuel, so you need to find a way to make all of their horizontal positions match while requiring them to spend as little fuel as possible.
+//!
+//! For example, consider the following horizontal positions:
+//!
+//! 16,1,2,0,4,2,7,1,2,14
+//! This means there's a crab with horizontal position 16, a crab with horizontal position 1, and so on.
+//!
+//! Each change of 1 step in horizontal position of a single crab costs 1 fuel. You could choose any horizontal position to align them all on, but the one that costs the least fuel is horizontal position 2:
+//!
+//! Move from 16 to 2: 14 fuel
+//! Move from 1 to 2: 1 fuel
+//! Move from 2 to 2: 0 fuel
+//! Move from 0 to 2: 2 fuel
+//! Move from 4 to 2: 2 fuel
+//! Move from 2 to 2: 0 fuel
+//! Move from 7 to 2: 5 fuel
+//! Move from 1 to 2: 1 fuel
+//! Move from 2 to 2: 0 fuel
+//! Move from 14 to 2: 12 fuel
+//! This costs a total of 37 fuel. This is the cheapest possible outcome; more expensive outcomes include aligning at position 1 (41 fuel), position 3 (39 fuel), or position 10 (71 fuel).
+//!
+//! Determine the horizontal position that the crabs can align to using the least fuel possible. How much fuel must they spend to align to that position?
+//!
+//!  --- Part Two ---
+//! The crabs don't seem interested in your proposed solution. Perhaps you misunderstand crab engineering?
+//!
+//! As it turns out, crab submarine engines don't burn fuel at a constant rate. Instead, each change of 1 step in horizontal position costs 1 more unit of fuel than the last: the first step costs 1, the second step costs 2, the third step costs 3, and so on.
+//!
+//! As each crab moves, moving further becomes more expensive. This changes the best horizontal position to align them all on; in the example above, this becomes 5:
+//!
+//! Move from 16 to 5: 66 fuel
+//! Move from 1 to 5: 10 fuel
+//! Move from 2 to 5: 6 fuel
+//! Move from 0 to 5: 15 fuel
+//! Move from 4 to 5: 1 fuel
+//! Move from 2 to 5: 6 fuel
+//! Move from 7 to 5: 3 fuel
+//! Move from 1 to 5: 10 fuel
+//! Move from 2 to 5: 6 fuel
+//! Move from 14 to 5: 45 fuel
+//! This costs a total of 168 fuel. This is the new cheapest possible outcome; the old alignment position (2) now costs 206 fuel instead.
+//!
+//! Determine the horizontal position that the crabs can align to using the least fuel possible so they can make you an escape route! How much fuel must they spend to align to that position?
+use std::num::ParseIntError;
+
+use anyhow::Result;
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[aoc_generator(day7)]
+fn parse(input: &str) -> Result<Vec<u64>, ParseIntError> {
+    input
+        .split(',')
+        .map(|s| s.parse())
+        .collect::<Result<Vec<u64>, ParseIntError>>()
+}
+
+fn score1(nums: &[u64], mid: u64) -> u64 {
+    nums.iter()
+        .map(|n| ((*n as i64) - (mid as i64)).abs())
+        .sum::<i64>() as u64
+}
+
+#[aoc(day7, part1)]
+fn part1(input: &[u64]) -> Result<u64> {
+    let mut input: Vec<_> = input.to_vec();
+    input.sort_unstable();
+    Ok(score1(&input, input[input.len() / 2]))
+}
+
+fn score2(nums: &[u64], mid: u64) -> u64 {
+    nums.iter()
+        .map(|n| {
+            let d = ((*n as i64) - (mid as i64)).abs();
+            (d * (d + 1)) / 2
+        })
+        .sum::<i64>() as u64
+}
+
+#[aoc(day7, part2)]
+fn part2(input: &[u64]) -> Result<u64> {
+    let input: Vec<_> = input.to_vec();
+    let avg = input.iter().sum::<u64>() / input.len() as u64;
+
+    let s = if avg > 10 { avg - 10 } else { 0 };
+    let num = input.len() as u64;
+    let e = if avg + 10 < num { avg + 10 } else { num };
+    let answer = (s..e)
+        .map(|i| score2(&input, i))
+        .min()
+        .expect("couldn't find min");
+    if input.len() > 10 {
+        // The real data needs an answer lower than our first attempt.
+        assert!(answer < 94862126);
+    }
+    Ok(answer)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_score1() -> Result<()> {
+        let nums: Vec<u64> = parse("16,1,2,0,4,2,7,1,2,14")?;
+        assert_eq!(score1(&nums, 1), 41);
+        assert_eq!(score1(&nums, 2), 37);
+        assert_eq!(score1(&nums, 3), 39);
+        assert_eq!(score1(&nums, 10), 71);
+        Ok(())
+    }
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"16,1,2,0,4,2,7,1,2,14"#.trim();
+        assert_eq!(part1(&parse(input)?)?, 37);
+        Ok(())
+    }
+
+    #[test]
+    fn test_score2() -> Result<()> {
+        let nums: Vec<u64> = parse("16,1,2,0,4,2,7,1,2,14")?;
+        assert_eq!(score2(&nums, 5), 168);
+        assert_eq!(score2(&nums, 2), 206);
+        Ok(())
+    }
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"16,1,2,0,4,2,7,1,2,14"#.trim();
+        assert_eq!(part2(&parse(input)?)?, 168);
+        Ok(())
+    }
+}

2021/src/day8.rs

@@ -0,0 +1,331 @@
+//! --- Day 8: Seven Segment Search ---
+//! You barely reach the safety of the cave when the whale smashes into the cave mouth, collapsing it. Sensors indicate another exit to this cave at a much greater depth, so you have no choice but to press on.
+//!
+//! As your submarine slowly makes its way through the cave system, you notice that the four-digit seven-segment displays in your submarine are malfunctioning; they must have been damaged during the escape. You'll be in a lot of trouble without them, so you'd better figure out what's wrong.
+//!
+//! Each digit of a seven-segment display is rendered by turning on or off any of seven segments named a through g:
+//!
+//!   0:      1:      2:      3:      4:
+//!  aaaa    ....    aaaa    aaaa    ....
+//! b    c  .    c  .    c  .    c  b    c
+//! b    c  .    c  .    c  .    c  b    c
+//!  ....    ....    dddd    dddd    dddd
+//! e    f  .    f  e    .  .    f  .    f
+//! e    f  .    f  e    .  .    f  .    f
+//!  gggg    ....    gggg    gggg    ....
+//!
+//!   5:      6:      7:      8:      9:
+//!  aaaa    aaaa    aaaa    aaaa    aaaa
+//! b    .  b    .  .    c  b    c  b    c
+//! b    .  b    .  .    c  b    c  b    c
+//!  dddd    dddd    ....    dddd    dddd
+//! .    f  e    f  .    f  e    f  .    f
+//! .    f  e    f  .    f  e    f  .    f
+//!  gggg    gggg    ....    gggg    gggg
+//! So, to render a 1, only segments c and f would be turned on; the rest would be off. To render a 7, only segments a, c, and f would be turned on.
+//!
+//! The problem is that the signals which control the segments have been mixed up on each display. The submarine is still trying to display numbers by producing output on signal wires a through g, but those wires are connected to segments randomly. Worse, the wire/segment connections are mixed up separately for each four-digit display! (All of the digits within a display use the same connections, though.)
+//!
+//! So, you might know that only signal wires b and g are turned on, but that doesn't mean segments b and g are turned on: the only digit that uses two segments is 1, so it must mean segments c and f are meant to be on. With just that information, you still can't tell which wire (b/g) goes to which segment (c/f). For that, you'll need to collect more information.
+//!
+//! For each display, you watch the changing signals for a while, make a note of all ten unique signal patterns you see, and then write down a single four digit output value (your puzzle input). Using the signal patterns, you should be able to work out which pattern corresponds to which digit.
+//!
+//! For example, here is what you might see in a single entry in your notes:
+//!
+//! acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab |
+//! cdfeb fcadb cdfeb cdbaf
+//! (The entry is wrapped here to two lines so it fits; in your notes, it will all be on a single line.)
+//!
+//! Each entry consists of ten unique signal patterns, a | delimiter, and finally the four digit output value. Within an entry, the same wire/segment connections are used (but you don't know what the connections actually are). The unique signal patterns correspond to the ten different ways the submarine tries to render a digit using the current wire/segment connections. Because 7 is the only digit that uses three segments, dab in the above example means that to render a 7, signal lines d, a, and b are on. Because 4 is the only digit that uses four segments, eafb means that to render a 4, signal lines e, a, f, and b are on.
+//!
+//! Using this information, you should be able to work out which combination of signal wires corresponds to each of the ten digits. Then, you can decode the four digit output value. Unfortunately, in the above example, all of the digits in the output value (cdfeb fcadb cdfeb cdbaf) use five segments and are more difficult to deduce.
+//!
+//! For now, focus on the easy digits. Consider this larger example:
+//!
+//! be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb |
+//! fdgacbe cefdb cefbgd gcbe
+//! edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec |
+//! fcgedb cgb dgebacf gc
+//! fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef |
+//! cg cg fdcagb cbg
+//! fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega |
+//! efabcd cedba gadfec cb
+//! aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga |
+//! gecf egdcabf bgf bfgea
+//! fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf |
+//! gebdcfa ecba ca fadegcb
+//! dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf |
+//! cefg dcbef fcge gbcadfe
+//! bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd |
+//! ed bcgafe cdgba cbgef
+//! egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg |
+//! gbdfcae bgc cg cgb
+//! gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc |
+//! fgae cfgab fg bagce
+//! Because the digits 1, 4, 7, and 8 each use a unique number of segments, you should be able to tell which combinations of signals correspond to those digits. Counting only digits in the output values (the part after | on each line), in the above example, there are 26 instances of digits that use a unique number of segments (highlighted above).
+//!
+//! In the output values, how many times do digits 1, 4, 7, or 8 appear?
+//!
+//! --- Part Two ---
+//! Through a little deduction, you should now be able to determine the remaining digits. Consider again the first example above:
+//!
+//! acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab |
+//! cdfeb fcadb cdfeb cdbaf
+//! After some careful analysis, the mapping between signal wires and segments only make sense in the following configuration:
+//!
+//!  dddd
+//! e    a
+//! e    a
+//!  ffff
+//! g    b
+//! g    b
+//!  cccc
+//! So, the unique signal patterns would correspond to the following digits:
+//!
+//! acedgfb: 8
+//! cdfbe: 5
+//! gcdfa: 2
+//! fbcad: 3
+//! dab: 7
+//! cefabd: 9
+//! cdfgeb: 6
+//! eafb: 4
+//! cagedb: 0
+//! ab: 1
+//! Then, the four digits of the output value can be decoded:
+//!
+//! cdfeb: 5
+//! fcadb: 3
+//! cdfeb: 5
+//! cdbaf: 3
+//! Therefore, the output value for this entry is 5353.
+//!
+//! Following this same process for each entry in the second, larger example above, the output value of each entry can be determined:
+//!
+//! fdgacbe cefdb cefbgd gcbe: 8394
+//! fcgedb cgb dgebacf gc: 9781
+//! cg cg fdcagb cbg: 1197
+//! efabcd cedba gadfec cb: 9361
+//! gecf egdcabf bgf bfgea: 4873
+//! gebdcfa ecba ca fadegcb: 8418
+//! cefg dcbef fcge gbcadfe: 4548
+//! ed bcgafe cdgba cbgef: 1625
+//! gbdfcae bgc cg cgb: 8717
+//! fgae cfgab fg bagce: 4315
+//! Adding all of the output values in this larger example produces 61229.
+//!
+//! For each entry, determine all of the wire/segment connections and decode the four-digit output values. What do you get if you add up all of the output values?
+//!
+use std::{
+    collections::HashMap,
+    convert::Infallible,
+    fmt::{Debug, Error, Formatter},
+    ops::BitAnd,
+    str::FromStr,
+};
+
+use anyhow::Result;
+use aoc_runner_derive::aoc;
+
+#[aoc(day8, part1, original)]
+fn part1(input: &str) -> Result<usize> {
+    Ok(input
+        .lines()
+        .map(|l| {
+            l.split_once(" | ")
+                .unwrap()
+                .1
+                .split(' ')
+                // 1 | 7 | 4 | 8
+                .filter(|s| matches!(s.len(), 2 | 3 | 4 | 7))
+                .count()
+        })
+        .sum())
+}
+
+#[aoc(day8, part1, no_result)]
+fn part1_no_result(input: &str) -> usize {
+    input
+        .lines()
+        .map(|l| {
+            l.split_once(" | ")
+                .unwrap()
+                .1
+                .split(' ')
+                // 1 | 7 | 4 | 8
+                .filter(|s| matches!(s.len(), 2 | 3 | 4 | 7))
+                .count()
+        })
+        .sum()
+}
+
+#[aoc(day8, part1, flat_map)]
+fn part1_flat_map(input: &str) -> usize {
+    input
+        .lines()
+        .flat_map(|l| l.split_once(" | ").unwrap().1.split(' '))
+        // 1 | 7 | 4 | 8
+        .filter(|s| matches!(s.len(), 2 | 3 | 4 | 7))
+        .count()
+}
+
+#[aoc(day8, part1, glenng)]
+fn part1_glenng(input: &str) -> usize {
+    input
+        .split('\n')
+        .flat_map(|line| {
+            let (_, output) = line.split_once(" | ").unwrap();
+            output.split(' ')
+        })
+        .filter(|s| [2usize, 3, 4, 7].contains(&s.len()))
+        .count()
+}
+
+#[derive(Copy, Clone, Eq, Hash, PartialEq)]
+struct Segment(u8);
+
+impl Debug for Segment {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        write!(f, "{:07b}", self.0)
+    }
+}
+
+impl FromStr for Segment {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut bits = 0;
+        for b in s.as_bytes() {
+            bits |= 1 << (b - b'a');
+        }
+
+        Ok(Segment(bits))
+    }
+}
+
+impl BitAnd for Segment {
+    type Output = Self;
+
+    // rhs is the "right-hand side" of the expression `a & b`
+    fn bitand(self, rhs: Self) -> Self::Output {
+        Self(self.0 & rhs.0)
+    }
+}
+
+fn build_lookup(input: &str) -> Result<HashMap<Segment, u8>> {
+    let mut map: HashMap<u8, Segment> = HashMap::new();
+    let set: Vec<_> = input.split(' ').collect();
+    for digit in &set {
+        let s = digit.parse().unwrap();
+        match digit.len() {
+            // 1
+            2 => map.insert(1, s),
+            // 7
+            3 => map.insert(7, s),
+            // 4
+            4 => map.insert(4, s),
+            // 8
+            7 => map.insert(8, s),
+            _ => None,
+        };
+    }
+    let one = map[&1];
+    let four = map[&4];
+
+    // 0, 6 or 9 have 6 segments:
+    // 9 contains 1 and 4
+    // 0 intersects w/ 1 but not w/ 4
+    // 6 is the left overs.
+    set.iter().filter(|s| s.len() == 6).for_each(|d| {
+        let s: Segment = d.parse().unwrap();
+        if s & one == one && s & four == four {
+            map.insert(9, s);
+        } else if s & one == one {
+            map.insert(0, s);
+        } else {
+            map.insert(6, s);
+        }
+    });
+
+    let nine = map[&9];
+    // 2, 3 and 5 have 5 segments:
+    // 3 has overlap w/ 1
+    // 5 is a subset of 9
+    // 2 is the left overs.
+    set.iter().filter(|s| s.len() == 5).for_each(|d| {
+        let s: Segment = d.parse().unwrap();
+        if s & one == one {
+            map.insert(3, s);
+        } else if s & nine == s {
+            map.insert(5, s);
+        } else {
+            map.insert(2, s);
+        }
+    });
+
+    // Swap key/value.
+    Ok(map.into_iter().map(|(k, v)| (v, k)).collect())
+}
+
+fn output(line: &str) -> Result<u64> {
+    let (inp, out) = line.split_once(" | ").expect("line missing |");
+    let lookup = build_lookup(inp)?;
+    Ok(out
+        .split(' ')
+        .map(|s| {
+            let s: Segment = s.parse().unwrap();
+            lookup[&s]
+        })
+        .fold(0, |answer, d| 10 * answer + d as u64))
+}
+
+#[aoc(day8, part2)]
+fn part2(input: &str) -> Result<u64> {
+    Ok(input
+        .lines()
+        .map(|l| output(l).expect("couldn't parse line"))
+        .sum())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce
+"#
+        .trim();
+        assert_eq!(part1(input)?, 26);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce
+    "#
+        .trim();
+        assert_eq!(part2(input)?, 61229);
+        Ok(())
+    }
+}

2021/src/day9.rs

@@ -0,0 +1,244 @@
+//! --- Day 9: Smoke Basin ---
+//! These caves seem to be lava tubes. Parts are even still volcanically active; small hydrothermal vents release smoke into the caves that slowly settles like rain.
+//!
+//! If you can model how the smoke flows through the caves, you might be able to avoid it and be that much safer. The submarine generates a heightmap of the floor of the nearby caves for you (your puzzle input).
+//!
+//! Smoke flows to the lowest point of the area it's in. For example, consider the following heightmap:
+//!
+//! 2199943210
+//! 3987894921
+//! 9856789892
+//! 8767896789
+//! 9899965678
+//! Each number corresponds to the height of a particular location, where 9 is the highest and 0 is the lowest a location can be.
+//!
+//! Your first goal is to find the low points - the locations that are lower than any of its adjacent locations. Most locations have four adjacent locations (up, down, left, and right); locations on the edge or corner of the map have three or two adjacent locations, respectively. (Diagonal locations do not count as adjacent.)
+//!
+//! In the above example, there are four low points, all highlighted: two are in the first row (a 1 and a 0), one is in the third row (a 5), and one is in the bottom row (also a 5). All other locations on the heightmap have some lower adjacent location, and so are not low points.
+//!
+//! The risk level of a low point is 1 plus its height. In the above example, the risk levels of the low points are 2, 1, 6, and 6. The sum of the risk levels of all low points in the heightmap is therefore 15.
+//!
+//! Find all of the low points on your heightmap. What is the sum of the risk levels of all low points on your heightmap?
+//!
+//! --- Part Two ---
+//! Next, you need to find the largest basins so you know what areas are most important to avoid.
+//!
+//! A basin is all locations that eventually flow downward to a single low point. Therefore, every low point has a basin, although some basins are very small. Locations of height 9 do not count as being in any basin, and all other locations will always be part of exactly one basin.
+//!
+//! The size of a basin is the number of locations within the basin, including the low point. The example above has four basins.
+//!
+//! The top-left basin, size 3:
+//!
+//! 2199943210
+//! 3987894921
+//! 9856789892
+//! 8767896789
+//! 9899965678
+//! The top-right basin, size 9:
+//!
+//! 2199943210
+//! 3987894921
+//! 9856789892
+//! 8767896789
+//! 9899965678
+//! The middle basin, size 14:
+//!
+//! 2199943210
+//! 3987894921
+//! 9856789892
+//! 8767896789
+//! 9899965678
+//! The bottom-right basin, size 9:
+//!
+//! 2199943210
+//! 3987894921
+//! 9856789892
+//! 8767896789
+//! 9899965678
+//! Find the three largest basins and multiply their sizes together. In the above example, this is 9 * 14 * 9 = 1134.
+//!
+//! What do you get if you multiply together the sizes of the three largest basins?
+
+use std::{
+    collections::{HashSet, VecDeque},
+    convert::Infallible,
+    fmt::{Debug, Error, Formatter},
+    ops::Index,
+    str::FromStr,
+};
+
+use anyhow::Result;
+use aoc_runner_derive::{aoc, aoc_generator};
+
+struct HeightMap {
+    width: usize,
+    height: usize,
+    pixels: Vec<u8>,
+}
+
+impl Debug for HeightMap {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        for y in 0..self.height {
+            for x in 0..self.width {
+                write!(f, "{}", self[(x, y)])?;
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+impl HeightMap {
+    fn low_points(&self) -> Vec<u8> {
+        let mut pts = Vec::new();
+        for y in 0..self.height {
+            for x in 0..self.width {
+                let c = self[(x, y)];
+
+                if (x == 0 || c < self[(x - 1, y)])
+                    && (y == 0 || c < self[(x, y - 1)])
+                    && (x == self.width - 1 || c < self[(x + 1, y)])
+                    && (y == self.height - 1 || c < self[(x, y + 1)])
+                {
+                    pts.push(c);
+                }
+            }
+        }
+        pts
+    }
+
+    // counts number of neighbors not 9.
+    fn flood_fill(&self, initial: (isize, isize), coords: &mut HashSet<(isize, isize)>) {
+        // This is an iterative implementation of what would be nice to do recursively. Rust
+        // stack overflows on the final dataset if written recursively.
+        let mut q = VecDeque::new();
+        q.push_back(initial);
+        while let Some((x, y)) = q.pop_front() {
+            // Can be negative or outside the width,height, Indeximpl will return 9.
+            let c = self[(x, y)] as usize;
+            if c == 9 {
+                // Don't count 9's that are neighbors and don't explore their neighbors.
+                continue;
+            }
+
+            if coords.insert((x, y)) {
+                q.push_back((x - 1, y));
+                q.push_back((x, y - 1));
+                q.push_back((x + 1, y));
+                q.push_back((x, y + 1));
+            }
+        }
+    }
+
+    fn basins(&self) -> Vec<usize> {
+        let mut bs = Vec::new();
+        for y in 0..self.height {
+            for x in 0..self.width {
+                let c = self[(x, y)];
+
+                if (x == 0 || c < self[(x - 1, y)])
+                    && (y == 0 || c < self[(x, y - 1)])
+                    && (x == self.width - 1 || c < self[(x + 1, y)])
+                    && (y == self.height - 1 || c < self[(x, y + 1)])
+                {
+                    let mut coords = HashSet::new();
+                    self.flood_fill((x as isize, y as isize), &mut coords);
+                    bs.push(coords.len());
+                }
+            }
+        }
+        bs
+    }
+}
+
+// Index implementation that panics if x or y are greater than width or height.
+impl Index<(usize, usize)> for HeightMap {
+    type Output = u8;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+// Index implementation that returns 9 for out of range requests.
+impl Index<(isize, isize)> for HeightMap {
+    type Output = u8;
+    fn index(&self, (x, y): (isize, isize)) -> &Self::Output {
+        if x < 0 || y < 0 || x > self.width as isize - 1 || y > self.height as isize - 1 {
+            return &9;
+        }
+        &self.pixels[x as usize + y as usize * self.width]
+    }
+}
+
+impl FromStr for HeightMap {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let rows: Vec<_> = s.lines().collect();
+        let width = rows[0].len();
+        let height = rows.len();
+        let pixels = rows
+            .iter()
+            .flat_map(|row| row.as_bytes().iter().map(|b| b - b'0'))
+            .collect();
+
+        Ok(HeightMap {
+            width,
+            height,
+            pixels,
+        })
+    }
+}
+
+#[aoc_generator(day9)]
+fn parse(input: &str) -> Result<HeightMap> {
+    Ok(input.parse()?)
+}
+
+#[aoc(day9, part1)]
+fn part1(input: &HeightMap) -> Result<u64> {
+    Ok(input.low_points().iter().map(|b| (*b + 1) as u64).sum())
+}
+
+#[aoc(day9, part2)]
+fn part2(hm: &HeightMap) -> Result<usize> {
+    let mut sizes = hm.basins();
+    sizes.sort_unstable();
+    Ok(sizes[sizes.len() - 3..].iter().product())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678
+"#
+        .trim();
+        let hm = parse(input)?;
+        assert_eq!(hm.low_points(), vec![1, 0, 5, 5]);
+        assert_eq!(part1(&hm)?, 15);
+        Ok(())
+    }
+
+    #[test]
+    fn test_part2() -> Result<()> {
+        let input = r#"
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678
+"#
+        .trim();
+        let hm = parse(input)?;
+        assert_eq!(hm.basins(), vec![3, 9, 14, 9]);
+        assert_eq!(part2(&hm)?, 1134);
+        Ok(())
+    }
+}

2021/src/lib.rs

@@ -0,0 +1,37 @@
+pub mod day1;
+pub mod day10;
+pub mod day11;
+pub mod day12;
+pub mod day13;
+//pub mod day14;
+pub mod day15;
+pub mod day16;
+pub mod day17;
+//pub mod day18;
+pub mod day19;
+pub mod day2;
+pub mod day20;
+pub mod day21;
+pub mod day22;
+//pub mod day23;
+pub mod day3;
+pub mod day4;
+pub mod day5;
+pub mod day6;
+pub mod day7;
+pub mod day8;
+pub mod day9;
+
+use aoc_runner_derive::aoc_lib;
+
+#[macro_export]
+macro_rules! debug_print{
+    ($($arg:tt)*) => (#[cfg(debug_assertions)] print!($($arg)*));
+}
+
+#[macro_export]
+macro_rules! debug_println {
+    ($($arg:tt)*) => (#[cfg(debug_assertions)] println!($($arg)*));
+}
+
+aoc_lib! { year = 2021 }

2021/src/main.rs

@@ -0,0 +1,3 @@
+use aoc_runner_derive::aoc_main;
+
+aoc_main! { lib = advent2021 }

2021/src/template.rs

@@ -0,0 +1,41 @@
+use advent::prelude::*;
+use aoc_runner_derive::aoc;
+
+#[aoc(dayX, part1)]
+fn part1(input: &str) -> Result<usize> {
+    todo!("part1");
+    Ok(0)
+}
+
+/*
+#[aoc(dayX, part2)]
+fn part2(input: &str) -> Result<usize> {
+    todo!("part2");
+    Ok(0)
+}
+*/
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+"#
+        .trim();
+        assert_eq!(part1(input)?, usize::MAX);
+        Ok(())
+    }
+
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+        let input = r#"
+    "#
+        .trim();
+        assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "advent"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.45"
+aoc-runner = "0.3.0"
+aoc-runner-derive = "0.3.0"
+pretty_assertions = "1.0.0"
+thiserror = "1.0.30"
+
+[lib]
+name = "advent"

input/2021/day5.txt

@@ -0,0 +1,500 @@
+217,490 -> 217,764
+44,270 -> 373,599
+440,139 -> 440,303
+161,663 -> 345,663
+848,963 -> 908,963
+299,207 -> 162,70
+77,346 -> 77,686
+693,743 -> 693,127
+96,459 -> 96,779
+864,39 -> 233,670
+58,79 -> 203,79
+158,596 -> 463,291
+633,293 -> 136,293
+656,474 -> 656,72
+148,754 -> 947,754
+535,780 -> 535,460
+821,701 -> 821,796
+592,200 -> 592,610
+620,786 -> 722,786
+632,731 -> 536,731
+825,640 -> 195,10
+956,547 -> 956,387
+25,32 -> 981,988
+870,613 -> 870,16
+369,780 -> 369,362
+348,924 -> 243,924
+28,114 -> 540,114
+702,690 -> 702,335
+836,442 -> 184,442
+602,11 -> 602,651
+76,988 -> 608,988
+15,922 -> 951,922
+363,18 -> 296,18
+130,580 -> 516,580
+799,335 -> 858,335
+571,842 -> 571,800
+684,654 -> 684,971
+815,674 -> 66,674
+575,612 -> 575,919
+652,126 -> 822,296
+391,493 -> 730,493
+810,479 -> 810,807
+397,420 -> 780,37
+187,740 -> 869,740
+175,626 -> 175,169
+773,901 -> 773,44
+45,130 -> 45,17
+226,253 -> 252,279
+481,928 -> 481,521
+121,506 -> 121,50
+306,386 -> 653,733
+115,635 -> 208,542
+619,67 -> 212,67
+82,79 -> 972,969
+15,20 -> 15,933
+606,136 -> 500,136
+791,250 -> 791,316
+128,931 -> 781,278
+11,365 -> 11,226
+705,326 -> 57,326
+778,632 -> 173,27
+121,624 -> 121,737
+30,815 -> 909,815
+18,114 -> 869,965
+554,741 -> 554,771
+284,826 -> 945,826
+386,654 -> 295,654
+235,848 -> 418,848
+536,59 -> 497,59
+156,922 -> 29,922
+57,718 -> 174,718
+964,774 -> 964,426
+729,950 -> 729,254
+896,117 -> 152,861
+603,919 -> 603,776
+176,472 -> 573,472
+25,970 -> 939,56
+478,482 -> 38,482
+155,936 -> 956,135
+351,621 -> 133,403
+513,323 -> 103,323
+679,167 -> 679,983
+910,456 -> 241,456
+16,266 -> 16,829
+338,791 -> 973,156
+564,73 -> 564,676
+196,800 -> 339,800
+15,776 -> 973,776
+719,134 -> 719,775
+730,692 -> 272,692
+247,770 -> 244,770
+853,720 -> 940,720
+685,379 -> 873,379
+944,647 -> 944,206
+67,974 -> 967,74
+828,194 -> 355,194
+596,522 -> 596,169
+677,970 -> 638,970
+587,427 -> 587,354
+804,488 -> 469,153
+355,653 -> 787,221
+798,873 -> 133,873
+565,798 -> 534,829
+239,273 -> 20,273
+942,138 -> 398,138
+499,743 -> 958,284
+913,466 -> 514,466
+504,705 -> 504,983
+455,863 -> 451,863
+638,255 -> 425,255
+338,724 -> 338,457
+147,880 -> 928,99
+11,955 -> 806,160
+566,961 -> 231,961
+870,560 -> 611,560
+714,925 -> 859,925
+484,946 -> 905,946
+112,394 -> 266,394
+191,728 -> 191,635
+983,806 -> 217,40
+575,286 -> 730,286
+366,323 -> 366,211
+383,990 -> 834,990
+834,976 -> 26,168
+819,492 -> 819,648
+257,522 -> 257,199
+756,176 -> 244,176
+165,199 -> 569,199
+896,943 -> 18,65
+986,642 -> 354,10
+864,381 -> 349,381
+177,982 -> 977,182
+458,254 -> 458,920
+550,322 -> 550,297
+956,748 -> 270,62
+412,305 -> 292,305
+201,571 -> 375,571
+608,139 -> 608,330
+646,718 -> 432,504
+449,325 -> 449,115
+315,971 -> 955,331
+248,143 -> 477,143
+956,858 -> 111,13
+776,608 -> 739,608
+44,842 -> 548,842
+590,487 -> 590,792
+978,127 -> 978,748
+620,948 -> 852,948
+67,403 -> 67,122
+340,256 -> 346,256
+803,58 -> 474,387
+876,448 -> 876,55
+78,288 -> 565,288
+235,80 -> 480,80
+949,880 -> 949,666
+529,734 -> 529,332
+780,973 -> 780,824
+900,279 -> 698,279
+290,438 -> 34,694
+766,569 -> 766,443
+729,690 -> 729,137
+72,938 -> 72,893
+960,563 -> 960,322
+669,293 -> 578,293
+396,388 -> 984,388
+675,694 -> 211,230
+152,743 -> 63,743
+203,660 -> 391,660
+582,806 -> 906,806
+698,837 -> 698,483
+869,320 -> 595,594
+283,817 -> 283,861
+919,926 -> 919,235
+16,64 -> 930,978
+980,25 -> 16,989
+181,890 -> 952,119
+877,731 -> 877,364
+130,55 -> 130,111
+30,298 -> 590,858
+134,933 -> 134,41
+711,853 -> 711,196
+123,206 -> 841,924
+130,585 -> 130,394
+161,952 -> 531,952
+455,830 -> 455,919
+612,817 -> 30,817
+461,474 -> 106,119
+511,100 -> 581,30
+263,550 -> 263,814
+976,973 -> 14,11
+749,876 -> 380,876
+731,226 -> 731,659
+630,682 -> 570,622
+914,780 -> 311,780
+975,274 -> 87,274
+328,957 -> 724,957
+357,950 -> 357,659
+466,580 -> 466,726
+854,425 -> 854,559
+39,106 -> 39,82
+675,711 -> 956,711
+204,117 -> 672,585
+867,101 -> 49,919
+849,88 -> 784,88
+394,249 -> 394,730
+865,188 -> 125,928
+316,918 -> 722,918
+781,336 -> 781,551
+821,826 -> 258,826
+597,273 -> 597,653
+726,266 -> 90,902
+701,701 -> 941,701
+105,401 -> 949,401
+890,486 -> 890,205
+651,409 -> 651,408
+450,88 -> 51,88
+29,478 -> 29,667
+676,293 -> 676,77
+380,773 -> 962,773
+253,836 -> 429,836
+833,706 -> 123,706
+689,167 -> 665,143
+375,540 -> 375,346
+867,222 -> 746,343
+99,832 -> 370,561
+133,349 -> 133,815
+950,981 -> 12,43
+195,466 -> 644,466
+84,876 -> 84,720
+128,237 -> 34,331
+872,947 -> 960,947
+641,220 -> 641,472
+489,950 -> 489,441
+508,513 -> 721,300
+394,137 -> 332,137
+456,672 -> 625,503
+65,463 -> 540,463
+207,745 -> 529,423
+948,888 -> 891,831
+39,642 -> 165,642
+20,228 -> 20,386
+706,50 -> 57,699
+66,736 -> 66,840
+944,450 -> 915,479
+697,988 -> 697,862
+987,969 -> 57,39
+64,813 -> 64,468
+814,85 -> 469,85
+667,749 -> 154,236
+755,337 -> 755,50
+536,185 -> 536,217
+732,48 -> 529,48
+33,578 -> 430,578
+511,658 -> 669,658
+294,352 -> 353,352
+109,937 -> 820,226
+465,346 -> 465,114
+878,965 -> 34,121
+259,933 -> 576,933
+240,750 -> 240,296
+567,633 -> 899,965
+29,609 -> 169,469
+962,532 -> 962,921
+443,875 -> 395,875
+831,584 -> 510,263
+859,35 -> 84,810
+829,285 -> 829,463
+486,661 -> 883,661
+371,672 -> 959,84
+722,532 -> 722,241
+49,216 -> 468,216
+308,343 -> 308,277
+183,626 -> 264,545
+748,611 -> 356,611
+67,85 -> 925,943
+726,972 -> 726,272
+841,222 -> 841,867
+597,250 -> 813,250
+20,631 -> 555,631
+803,846 -> 589,632
+276,654 -> 222,708
+400,952 -> 672,952
+939,173 -> 534,173
+638,316 -> 638,935
+578,120 -> 578,101
+54,457 -> 723,457
+904,713 -> 904,721
+902,180 -> 99,983
+590,426 -> 174,10
+740,975 -> 309,975
+84,242 -> 803,961
+28,667 -> 362,333
+73,703 -> 73,354
+902,26 -> 902,365
+602,455 -> 578,431
+339,686 -> 339,846
+764,444 -> 311,444
+780,535 -> 862,453
+333,127 -> 911,127
+451,296 -> 451,832
+849,681 -> 849,580
+309,672 -> 309,913
+339,411 -> 147,411
+907,478 -> 974,545
+444,753 -> 855,342
+642,285 -> 683,244
+307,633 -> 751,633
+292,128 -> 767,603
+969,92 -> 647,414
+80,120 -> 942,982
+886,810 -> 740,810
+205,846 -> 168,846
+878,230 -> 72,230
+186,822 -> 628,822
+472,66 -> 472,609
+251,753 -> 129,753
+575,959 -> 102,959
+582,194 -> 858,194
+43,986 -> 43,589
+355,402 -> 751,402
+982,292 -> 86,292
+329,966 -> 329,379
+475,291 -> 475,924
+625,70 -> 625,350
+358,467 -> 981,467
+319,700 -> 736,283
+657,247 -> 654,247
+450,803 -> 450,497
+812,15 -> 812,425
+649,160 -> 377,160
+684,491 -> 690,491
+925,429 -> 772,429
+138,91 -> 883,91
+602,121 -> 774,293
+700,531 -> 451,531
+250,216 -> 800,766
+550,784 -> 289,784
+53,759 -> 228,759
+678,310 -> 645,343
+147,70 -> 171,46
+130,653 -> 130,103
+292,640 -> 731,640
+797,762 -> 618,762
+154,75 -> 964,885
+222,523 -> 557,523
+989,103 -> 989,964
+335,61 -> 422,61
+782,954 -> 160,332
+82,929 -> 82,528
+732,540 -> 635,637
+950,362 -> 798,362
+415,566 -> 916,566
+588,446 -> 743,291
+495,46 -> 495,435
+913,561 -> 303,561
+788,902 -> 788,698
+81,783 -> 715,149
+867,990 -> 867,558
+145,919 -> 145,725
+850,861 -> 727,861
+535,129 -> 535,496
+922,772 -> 922,917
+882,559 -> 672,349
+496,80 -> 496,948
+915,244 -> 516,643
+633,461 -> 748,461
+899,341 -> 677,341
+66,981 -> 878,169
+68,24 -> 984,940
+12,880 -> 23,869
+779,514 -> 779,752
+878,641 -> 949,641
+264,919 -> 229,919
+213,281 -> 213,196
+538,149 -> 538,278
+184,478 -> 364,298
+301,136 -> 923,758
+559,266 -> 559,986
+384,37 -> 384,558
+815,529 -> 800,514
+33,80 -> 624,80
+561,261 -> 215,607
+169,944 -> 169,921
+673,42 -> 164,42
+820,977 -> 424,581
+816,29 -> 802,29
+374,924 -> 121,671
+962,555 -> 426,19
+982,199 -> 860,77
+334,62 -> 359,62
+960,785 -> 260,85
+681,280 -> 860,280
+184,925 -> 184,30
+332,398 -> 858,924
+405,270 -> 218,270
+261,846 -> 29,614
+591,941 -> 591,716
+313,502 -> 313,637
+930,259 -> 779,259
+432,15 -> 566,149
+51,182 -> 223,182
+603,536 -> 603,281
+139,703 -> 825,17
+965,22 -> 55,932
+389,608 -> 771,608
+209,617 -> 923,617
+769,672 -> 769,236
+163,717 -> 638,717
+801,604 -> 136,604
+974,881 -> 110,17
+187,226 -> 929,968
+430,949 -> 473,949
+899,279 -> 899,224
+964,806 -> 964,876
+635,190 -> 349,190
+142,656 -> 142,216
+740,814 -> 35,109
+588,956 -> 534,956
+107,968 -> 707,968
+787,639 -> 787,50
+964,491 -> 964,148
+30,70 -> 30,323
+30,905 -> 806,129
+592,419 -> 91,419
+73,87 -> 973,987
+540,683 -> 540,139
+422,107 -> 422,90
+935,74 -> 935,590
+728,566 -> 188,26
+839,313 -> 839,620
+723,898 -> 723,719
+679,814 -> 679,617
+203,633 -> 417,633
+36,812 -> 546,302
+112,316 -> 598,802
+798,773 -> 989,964
+914,69 -> 520,69
+213,556 -> 213,19
+795,516 -> 795,220
+348,803 -> 664,803
+910,861 -> 238,189
+633,691 -> 594,691
+96,166 -> 96,60
+278,848 -> 854,272
+64,370 -> 64,815
+386,196 -> 386,222
+888,330 -> 888,834
+166,482 -> 37,482
+594,283 -> 594,865
+515,267 -> 515,448
+707,279 -> 239,747
+302,745 -> 302,268
+210,830 -> 885,155
+592,180 -> 592,324
+245,154 -> 245,613
+607,954 -> 545,954
+854,951 -> 19,116
+77,878 -> 963,878
+759,585 -> 759,892
+750,918 -> 750,130
+62,716 -> 329,983
+785,880 -> 785,590
+318,794 -> 318,599
+403,547 -> 719,863
+742,803 -> 742,937
+680,579 -> 680,425
+268,404 -> 826,962
+425,959 -> 710,959
+406,823 -> 976,253
+359,361 -> 165,361
+276,861 -> 657,480
+74,260 -> 743,929
+194,129 -> 194,651
+879,835 -> 65,21
+16,977 -> 980,13
+538,525 -> 624,439
+985,789 -> 985,510
+699,850 -> 560,711
+301,48 -> 477,224
+28,938 -> 905,61
+844,530 -> 793,530
+286,325 -> 936,975
+368,122 -> 677,431
+924,153 -> 924,774
+783,498 -> 783,148
+250,392 -> 578,392
+465,345 -> 573,345
+860,763 -> 860,40
+373,226 -> 599,226
+169,562 -> 169,292
+408,123 -> 569,123
+510,396 -> 733,396
+199,20 -> 199,770
+892,631 -> 237,631
+671,863 -> 705,863
+141,530 -> 141,630
+467,159 -> 367,159
+729,501 -> 255,975
+578,871 -> 578,225
+821,363 -> 821,820

rustfmt.toml

@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true

src/image.rs

@@ -0,0 +1,95 @@
+use crate::prelude::*;
+
+pub struct Image {
+    width: usize,
+    height: usize,
+    pixels: Vec<u8>,
+}
+
+impl Image {
+    fn kernel3x3<F>(&mut self, (x, y): (usize, usize), func: F)
+    where
+        F: Fn(u8) -> u8,
+    {
+        if x > 0 {
+            self[(x - 1, y)] = func(self[(x - 1, y)]);
+            if y > 0 {
+                self[(x - 1, y - 1)] = func(self[(x - 1, y - 1)]);
+            }
+            if y < self.height - 1 {
+                self[(x - 1, y + 1)] = func(self[(x - 1, y + 1)]);
+            }
+        }
+
+        if y > 0 {
+            self[(x, y - 1)] = func(self[(x, y - 1)]);
+        }
+        self[(x, y)] = func(self[(x, y)]);
+        if y < self.height - 1 {
+            self[(x, y + 1)] = func(self[(x, y + 1)]);
+        }
+
+        if x < self.width - 1 {
+            self[(x + 1, y)] = func(self[(x + 1, y)]);
+            if y > 0 {
+                self[(x + 1, y - 1)] = func(self[(x + 1, y - 1)]);
+            }
+            if y < self.height - 1 {
+                self[(x + 1, y + 1)] = func(self[(x + 1, y + 1)]);
+            }
+        }
+    }
+}
+
+impl PartialEq for Image {
+    fn eq(&self, other: &Self) -> bool {
+        self.width == other.width && self.height == other.height && self.pixels == other.pixels
+    }
+}
+
+impl Debug for Image {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+        writeln!(f)?;
+        for y in 0..self.height {
+            for x in 0..self.width {
+                write!(f, "{:2}", self[(x, y)] as char)?;
+            }
+            writeln!(f)?;
+        }
+        Ok(())
+    }
+}
+
+impl FromStr for Image {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let rows: Vec<_> = s.lines().collect();
+        let width = rows[0].len();
+        let height = rows.len();
+        let pixels = rows
+            .iter()
+            .flat_map(|row| row.as_bytes().iter())
+            .map(|b| *b)
+            .collect();
+
+        Ok(Image {
+            width,
+            height,
+            pixels,
+        })
+    }
+}
+
+impl Index<(usize, usize)> for Image {
+    type Output = u8;
+    fn index(&self, (x, y): (usize, usize)) -> &Self::Output {
+        &self.pixels[x + y * self.width]
+    }
+}
+
+impl IndexMut<(usize, usize)> for Image {
+    fn index_mut(&mut self, (x, y): (usize, usize)) -> &mut Self::Output {
+        &mut self.pixels[x + y * self.width]
+    }
+}

src/lib.rs

@@ -0,0 +1,18 @@
+pub mod prelude {
+    pub use std::{
+        collections::{HashMap, HashSet, VecDeque},
+        convert::Infallible,
+        fmt::{Debug, Display, Error, Formatter},
+        io::Read,
+        num::ParseIntError,
+        ops::{Index, IndexMut, RangeInclusive},
+        str::FromStr,
+    };
+
+    pub use anyhow::Result;
+    pub use thiserror::Error;
+
+    pub use crate::image::Image;
+}
+
+mod image;