Day 8 part 1 solution
This commit is contained in:
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612
2020/input/2020/day8.txt
Normal file
612
2020/input/2020/day8.txt
Normal file
@ -0,0 +1,612 @@
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acc +18
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nop +222
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acc -16
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acc +28
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jmp +475
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acc -6
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jmp +584
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acc -12
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acc -8
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jmp +554
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acc -9
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acc +12
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acc -16
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acc +27
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jmp +336
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acc -4
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jmp +214
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acc +38
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jmp +61
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acc +3
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acc +28
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acc +5
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acc -19
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jmp +584
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nop +206
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jmp +506
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acc +36
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jmp +133
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acc +20
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acc +43
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acc -18
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jmp +409
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acc +24
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jmp +131
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acc -12
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acc +7
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acc +7
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jmp +454
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acc +37
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acc -6
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nop +558
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acc +31
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jmp +124
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acc -15
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nop +201
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acc -7
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jmp +297
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acc +3
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nop +517
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jmp +221
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jmp +211
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acc +28
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acc +35
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jmp +5
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acc +31
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nop +325
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acc -15
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jmp +116
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jmp +1
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nop +333
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acc -2
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acc -5
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jmp +138
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acc +19
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acc +9
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jmp +180
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acc +18
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jmp +228
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jmp +495
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jmp +382
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acc +20
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nop +414
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nop +139
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acc +33
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jmp +171
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acc -10
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jmp +41
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acc -2
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jmp +80
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acc +20
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nop +451
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acc +2
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acc +24
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jmp +102
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acc +1
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acc -11
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acc +9
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acc +38
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jmp -73
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acc +17
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acc +16
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acc +12
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acc +43
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jmp +168
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jmp +286
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acc +6
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acc +6
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jmp +271
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acc -17
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acc -5
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acc +1
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jmp -50
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acc -9
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acc +6
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acc -2
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acc +33
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jmp +385
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acc +18
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acc +24
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jmp +370
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acc -5
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acc +23
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acc +6
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jmp +98
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acc -10
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acc -16
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jmp +329
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nop +41
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jmp +463
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nop +224
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acc +35
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jmp +345
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acc +34
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acc -18
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acc +5
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jmp +177
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nop -57
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nop -80
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acc +20
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jmp -12
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acc +24
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acc +39
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jmp +363
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jmp +253
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acc -14
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acc +0
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acc +22
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jmp +118
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acc +43
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acc -2
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jmp +300
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acc -14
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acc +8
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acc +47
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jmp +271
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jmp +420
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acc +33
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acc +15
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acc +20
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acc +25
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jmp +84
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acc +41
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jmp +420
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acc +25
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jmp +238
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jmp +1
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acc +14
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jmp +415
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jmp +68
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jmp +262
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acc +34
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jmp +346
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acc +39
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jmp +56
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jmp +364
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jmp -133
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acc +13
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jmp +1
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acc +33
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jmp +408
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acc +29
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acc -4
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jmp +319
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jmp +106
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jmp +228
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acc -8
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acc +8
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acc +22
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jmp -146
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jmp +223
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acc +27
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nop +191
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acc +49
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jmp +331
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jmp +39
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jmp -170
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acc +28
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acc -6
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acc +50
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jmp +268
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acc +41
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nop +254
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acc +28
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jmp +269
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jmp +140
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acc +10
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nop +131
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acc +3
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jmp -40
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jmp +373
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acc +47
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jmp -91
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acc -19
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jmp +300
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acc -2
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jmp +1
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acc +44
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acc -11
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jmp +306
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acc +33
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jmp -15
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acc +9
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jmp +1
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jmp +144
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acc +40
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nop +184
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nop -75
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nop +228
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jmp +296
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acc +22
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nop +364
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jmp -214
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jmp +18
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jmp +375
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acc +22
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jmp -67
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acc +8
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acc -17
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jmp +174
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jmp -99
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nop -45
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acc +7
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jmp -213
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jmp -218
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acc +50
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nop +52
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nop +98
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jmp -142
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acc +18
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jmp +252
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acc +36
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jmp -194
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acc +1
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nop -53
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jmp -127
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jmp +327
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acc +7
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acc -9
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acc +39
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nop -127
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jmp +84
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jmp -117
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nop -29
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acc +43
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jmp -216
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acc +25
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acc +16
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acc +40
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nop +122
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jmp +140
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jmp +180
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acc +42
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acc -5
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acc -14
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jmp -84
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jmp -31
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acc +37
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acc -11
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jmp -217
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jmp +210
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jmp +170
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nop +301
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jmp +309
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acc +6
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jmp +135
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acc +6
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nop -123
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acc +17
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jmp +315
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acc -1
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nop -46
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nop -58
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nop -59
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jmp +202
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acc +48
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acc +38
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jmp +86
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acc -4
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acc +33
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acc +28
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jmp -50
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nop +43
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acc +38
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acc +13
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jmp +33
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acc +4
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acc +6
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jmp -78
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acc +22
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acc +7
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acc -9
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jmp -56
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acc +30
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nop +54
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nop -81
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nop +198
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jmp +252
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jmp +1
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acc +6
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acc -10
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acc +29
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jmp -242
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jmp +1
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acc +42
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acc +34
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acc +22
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jmp +231
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acc +29
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acc -10
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jmp -161
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acc +37
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acc +9
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jmp -77
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acc -15
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acc +32
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acc +32
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jmp -6
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acc +0
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nop -124
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nop +174
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jmp +20
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acc +45
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acc +24
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jmp -13
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acc +6
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acc -10
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acc +23
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acc -15
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jmp +34
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acc +5
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acc +38
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acc +42
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jmp -116
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acc +0
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acc +8
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jmp -243
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acc -18
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acc +25
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acc +1
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jmp +158
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nop +65
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jmp +1
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jmp +151
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acc +12
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acc +12
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jmp +1
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jmp -305
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jmp +29
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jmp -263
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acc +33
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jmp +1
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nop +142
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jmp +78
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acc +41
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nop -141
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acc -9
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acc +5
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jmp -245
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jmp +41
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acc +16
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nop -83
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jmp -28
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nop -149
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acc +38
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jmp -15
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acc +7
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nop -329
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acc +5
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acc +21
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jmp -7
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acc -19
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jmp -38
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acc +5
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acc +3
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acc +10
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jmp -181
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jmp -240
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acc +19
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acc +15
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acc +31
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acc -11
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jmp -340
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acc +12
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acc +46
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jmp +127
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acc +12
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acc +31
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acc +30
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jmp -158
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acc -10
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jmp -374
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jmp +50
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acc +43
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nop +42
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acc +19
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jmp -232
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acc -14
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acc -4
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jmp +95
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acc +23
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acc +49
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acc +31
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nop -139
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jmp -272
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jmp -141
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acc +26
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acc -8
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jmp +173
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nop +145
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nop +133
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jmp +164
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acc +7
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jmp +23
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acc -4
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acc +48
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jmp -138
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acc +4
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jmp -389
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nop +156
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acc +44
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acc +40
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jmp +146
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nop -247
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acc +44
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jmp +1
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acc +28
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jmp +95
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acc +13
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acc +2
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jmp -254
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acc +24
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jmp +122
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acc +39
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acc +0
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jmp -12
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jmp -179
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nop -44
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nop +100
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acc -19
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nop -47
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jmp -107
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acc +32
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acc +33
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acc +42
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acc +6
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jmp -366
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jmp -122
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acc +2
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nop -443
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nop +72
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jmp -381
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jmp -446
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jmp -332
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acc -7
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acc +45
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jmp -355
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acc +27
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acc -4
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acc +3
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jmp +96
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acc +45
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jmp -402
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acc +45
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acc -3
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acc +22
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jmp -141
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acc +29
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acc -1
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jmp +29
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acc -1
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acc -10
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jmp -208
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acc +6
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nop -196
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jmp -218
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acc -12
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acc +49
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nop -137
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jmp -430
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acc +21
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jmp -110
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nop -287
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acc -3
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jmp -42
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jmp -487
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acc -16
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acc -1
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acc +7
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acc +39
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jmp -119
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jmp +1
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acc +9
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jmp -23
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acc +27
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jmp -300
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acc +12
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jmp -440
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acc +2
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acc +38
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acc +12
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jmp -84
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acc +25
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acc -14
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jmp -418
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acc -15
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acc +48
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jmp +1
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nop -383
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jmp -365
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acc +47
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jmp -193
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acc +23
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jmp -235
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jmp +1
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acc -4
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acc +35
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nop -64
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jmp -87
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acc +32
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jmp -339
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jmp -479
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acc -4
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||||
acc +32
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acc -10
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jmp -77
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acc +0
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||||
acc +47
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acc +41
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jmp -308
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acc -8
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acc -9
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||||
jmp -229
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acc -14
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acc +24
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nop -380
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acc +49
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jmp -174
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acc -11
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nop -69
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jmp +3
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acc -14
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jmp -89
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jmp -301
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acc +46
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acc +8
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nop -156
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acc +44
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jmp +1
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jmp +26
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acc +17
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acc +23
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acc +6
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jmp -4
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jmp -97
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jmp -324
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acc +2
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jmp -27
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nop -195
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acc +3
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acc -13
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acc +15
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||||
jmp -19
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acc +30
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nop -318
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jmp +19
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nop -72
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jmp -315
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acc +4
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nop +6
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jmp -384
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||||
jmp -505
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||||
jmp -512
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acc +33
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jmp -168
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jmp -443
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nop -519
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acc +7
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acc +41
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acc +15
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jmp -269
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nop -539
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jmp -416
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jmp -326
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nop -221
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acc +14
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jmp -186
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acc -1
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jmp -295
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acc +29
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acc +43
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nop -436
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nop -421
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jmp -123
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acc +13
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acc -11
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acc +12
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jmp -155
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acc +9
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acc -16
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acc -15
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nop -380
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jmp +1
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155
2020/src/day8.rs
Normal file
155
2020/src/day8.rs
Normal file
@ -0,0 +1,155 @@
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//! --- Day 8: Handheld Halting ---
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//! Your flight to the major airline hub reaches cruising altitude without incident. While you consider checking the in-flight menu for one of those drinks that come with a little umbrella, you are interrupted by the kid sitting next to you.
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//!
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//! Their handheld game console won't turn on! They ask if you can take a look.
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//!
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//! You narrow the problem down to a strange infinite loop in the boot code (your puzzle input) of the device. You should be able to fix it, but first you need to be able to run the code in isolation.
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//!
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//! The boot code is represented as a text file with one instruction per line of text. Each instruction consists of an operation (acc, jmp, or nop) and an argument (a signed number like +4 or -20).
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//!
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//! acc increases or decreases a single global value called the accumulator by the value given in the argument. For example, acc +7 would increase the accumulator by 7. The accumulator starts at 0. After an acc instruction, the instruction immediately below it is executed next.
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//! jmp jumps to a new instruction relative to itself. The next instruction to execute is found using the argument as an offset from the jmp instruction; for example, jmp +2 would skip the next instruction, jmp +1 would continue to the instruction immediately below it, and jmp -20 would cause the instruction 20 lines above to be executed next.
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//! nop stands for No OPeration - it does nothing. The instruction immediately below it is executed next.
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//! For example, consider the following program:
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//!
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//! nop +0
|
||||
//! acc +1
|
||||
//! jmp +4
|
||||
//! acc +3
|
||||
//! jmp -3
|
||||
//! acc -99
|
||||
//! acc +1
|
||||
//! jmp -4
|
||||
//! acc +6
|
||||
//! These instructions are visited in this order:
|
||||
//!
|
||||
//! nop +0 | 1
|
||||
//! acc +1 | 2, 8(!)
|
||||
//! jmp +4 | 3
|
||||
//! acc +3 | 6
|
||||
//! jmp -3 | 7
|
||||
//! acc -99 |
|
||||
//! acc +1 | 4
|
||||
//! jmp -4 | 5
|
||||
//! acc +6 |
|
||||
//! First, the nop +0 does nothing. Then, the accumulator is increased from 0 to 1 (acc +1) and jmp +4 sets the next instruction to the other acc +1 near the bottom. After it increases the accumulator from 1 to 2, jmp -4 executes, setting the next instruction to the only acc +3. It sets the accumulator to 5, and jmp -3 causes the program to continue back at the first acc +1.
|
||||
//!
|
||||
//! This is an infinite loop: with this sequence of jumps, the program will run forever. The moment the program tries to run any instruction a second time, you know it will never terminate.
|
||||
//!
|
||||
//! Immediately before the program would run an instruction a second time, the value in the accumulator is 5.
|
||||
//!
|
||||
//! Run your copy of the boot code. Immediately before any instruction is executed a second time, what value is in the accumulator?
|
||||
|
||||
use std::str::FromStr;
|
||||
|
||||
use aoc_runner_derive::aoc;
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
enum Instruction {
|
||||
Nop(i32),
|
||||
Acc(i32),
|
||||
Jmp(i32),
|
||||
}
|
||||
impl FromStr for Instruction {
|
||||
type Err = ();
|
||||
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
||||
let mut it = s.split(' ');
|
||||
Ok(match it.next() {
|
||||
Some("nop") => Instruction::Nop(it.next().ok_or(())?.parse().map_err(|_| ())?),
|
||||
Some("acc") => Instruction::Acc(it.next().ok_or(())?.parse().map_err(|_| ())?),
|
||||
Some("jmp") => Instruction::Jmp(it.next().ok_or(())?.parse().map_err(|_| ())?),
|
||||
Some(c) => panic!(format!("unknown instruction '{}'", c)),
|
||||
None => panic!(format!("no space in '{}'", s)),
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default, Debug, PartialEq)]
|
||||
struct Program {
|
||||
ip: usize,
|
||||
acc: i32,
|
||||
intrs: Vec<Instruction>,
|
||||
executed: Vec<bool>,
|
||||
}
|
||||
|
||||
impl Program {
|
||||
fn run(&mut self) -> i32 {
|
||||
loop {
|
||||
if self.executed[self.ip] {
|
||||
return self.acc;
|
||||
}
|
||||
self.executed[self.ip] = true;
|
||||
match self.intrs[self.ip] {
|
||||
Instruction::Nop(_) => self.ip += 1,
|
||||
Instruction::Acc(op) => {
|
||||
self.acc += op;
|
||||
self.ip += 1;
|
||||
}
|
||||
Instruction::Jmp(op) => self.ip = (self.ip as i32 + op) as usize,
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl FromStr for Program {
|
||||
type Err = ();
|
||||
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
||||
let intrs: Vec<_> = s.split('\n').filter_map(|i| i.parse().ok()).collect();
|
||||
let executed = vec![false; intrs.len()];
|
||||
Ok(Program {
|
||||
ip: 0,
|
||||
acc: 0,
|
||||
intrs,
|
||||
executed,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[aoc(day8, part1)]
|
||||
fn solution1(input: &str) -> i32 {
|
||||
let mut p: Program = input.parse().expect("Failed to parse Program");
|
||||
p.run()
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
const INPUT1: &'static str = r#"nop +0
|
||||
acc +1
|
||||
jmp +4
|
||||
acc +3
|
||||
jmp -3
|
||||
acc -99
|
||||
acc +1
|
||||
jmp -4
|
||||
acc +6"#;
|
||||
|
||||
#[test]
|
||||
fn make() {
|
||||
assert_eq!(
|
||||
INPUT1.parse::<Program>().expect("Failed to parse input"),
|
||||
Program {
|
||||
ip: 0,
|
||||
acc: 0,
|
||||
intrs: vec![
|
||||
Instruction::Nop(0),
|
||||
Instruction::Acc(1),
|
||||
Instruction::Jmp(4),
|
||||
Instruction::Acc(3),
|
||||
Instruction::Jmp(-3),
|
||||
Instruction::Acc(-99),
|
||||
Instruction::Acc(1),
|
||||
Instruction::Jmp(-4),
|
||||
Instruction::Acc(6),
|
||||
],
|
||||
executed: vec![false; 9],
|
||||
}
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn part1() {
|
||||
assert_eq!(solution1(&INPUT1), 5);
|
||||
}
|
||||
}
|
||||
@ -5,6 +5,7 @@ pub mod day4;
|
||||
pub mod day5;
|
||||
pub mod day6;
|
||||
pub mod day7;
|
||||
pub mod day8;
|
||||
|
||||
use aoc_runner_derive::aoc_lib;
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user