Day 14 part 1 solution
This commit is contained in:
parent
78063d8bf6
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577
2020/input/2020/day14.txt
Normal file
577
2020/input/2020/day14.txt
Normal file
@ -0,0 +1,577 @@
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mask = 00101X10011X0X111110010X010011X10101
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mem[41248] = 4595332
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mem[26450] = 60
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mem[32210] = 982366
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mem[1060] = 234632920
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mem[20694] = 38159
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mem[45046] = 58906955
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mask = 010110010X1101XX11X0100001X0000X00X1
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||||
mem[16069] = 7758
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mem[55864] = 2473265
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mem[37095] = 103513009
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mem[4911] = 1002
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mem[63231] = 6932274
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mem[21265] = 72322159
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||||
mem[43724] = 16591353
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||||
mask = 01001X01X101011101010101011X1X000000
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||||
mem[63470] = 30339812
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||||
mem[16920] = 471738
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mem[1014] = 29735753
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mem[61061] = 6866
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mem[8437] = 9138168
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mem[46487] = 1819945
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mem[2985] = 15040783
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mask = 0X10X1101111001X1X100X1X00011100XX11
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||||
mem[32836] = 12902
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mem[60365] = 24782
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mem[29953] = 10085
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mem[18214] = 1160
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mask = 001011X10X11100000100X0X0X0X01011001
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mem[39434] = 37383633
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mem[278] = 670174555
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mem[34062] = 20749996
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mem[2583] = 6222093
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mask = 01X111X1001101X11110100XX001X1000XX1
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||||
mem[6075] = 49890
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||||
mem[9363] = 2392780
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mem[24967] = 218861
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mask = X110111X1XX1010101111X01XX1000X001X1
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||||
mem[41334] = 11836
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||||
mem[24242] = 7263066
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||||
mem[17289] = 64986060
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||||
mem[2583] = 4702503
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||||
mem[21650] = 103905
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mem[134] = 486675
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mask = 00X010100110XXXX111000XXX1000011000X
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||||
mem[45307] = 37940
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||||
mem[16597] = 224911
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||||
mem[17943] = 392744
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||||
mem[55001] = 622484
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||||
mem[35954] = 470
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||||
mask = 11X01011X11000X1X1100X100X011101X011
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||||
mem[1005] = 56755
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||||
mem[16146] = 4333571
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||||
mem[32347] = 10486693
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||||
mem[11452] = 377363
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||||
mem[25158] = 328161913
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||||
mem[51956] = 250388
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||||
mem[10044] = 34078606
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mask = 011011X1X111010111110000X001X1X00110
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||||
mem[8773] = 10575925
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||||
mem[33116] = 175
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||||
mem[36101] = 14593
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||||
mask = 0100010X110X0101010XX10X011111XX1101
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||||
mem[21083] = 1922
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||||
mem[3653] = 912
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mem[26768] = 7321934
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||||
mem[49134] = 17616
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||||
mem[62950] = 41565481
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||||
mem[12957] = 2136786
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||||
mem[10324] = 17788
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||||
mask = X11X0X0X11010101110X01111010X1100X11
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||||
mem[5462] = 18755
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||||
mem[39408] = 2435211
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||||
mem[49271] = 6589
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||||
mask = X1X011XX01X100010110001X0X0X111X1100
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||||
mem[52570] = 2166
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||||
mem[28731] = 16573421
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||||
mem[18265] = 1192
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||||
mem[22435] = 10856992
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||||
mem[19263] = 7550
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||||
mem[30541] = 434738
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||||
mem[36101] = 869138
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||||
mask = 010001X001010001XX010100000010110X01
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||||
mem[52893] = 125505223
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||||
mem[22919] = 597
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||||
mem[62950] = 54107
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mem[52797] = 7649588
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mem[30421] = 3968
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mem[30429] = 614720
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mask = 01X0X10001X100010X1011XX00000X111X00
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||||
mem[44718] = 11141064
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||||
mem[42713] = 206218234
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||||
mem[51781] = 527553473
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mem[1967] = 27527823
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||||
mem[6386] = 5404
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mask = 00101X10XX11X0XX1110001000001110X11X
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mem[62339] = 72046594
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||||
mem[14657] = 3243652
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mem[750] = 40239
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mem[134] = 1936539
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||||
mem[5775] = 266384125
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mask = 011X111XXX110X01X11X000X00010100011X
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||||
mem[2956] = 438895
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||||
mem[41520] = 7282
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||||
mem[42192] = 34769
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mem[8837] = 2587
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||||
mask = 01XX11100101000X0X10011XX01010011101
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||||
mem[12515] = 450388
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||||
mem[62175] = 649233
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||||
mem[54743] = 129273
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||||
mem[10284] = 159823
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mem[31311] = 16983
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||||
mem[56137] = 852771967
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mask = 11010X1X01010101X1010X11101111X00010
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||||
mem[47190] = 526627409
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mem[34299] = 540572
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mem[61226] = 61426238
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||||
mem[12892] = 61446
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||||
mem[33421] = 4192
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||||
mask = 0110111111X10101111010100XX01XX10100
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||||
mem[41685] = 258
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||||
mem[26983] = 60795579
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mem[28064] = 10483
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mem[33070] = 66557269
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mem[12624] = 448724
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mem[38125] = 141175913
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mask = 010X1X00X101000X0111010101XX01011000
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||||
mem[12957] = 7693971
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||||
mem[45285] = 4628
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mem[48546] = 799
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mem[17857] = 7578026
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mask = 00101X100101X0010110000000XX1010X110
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||||
mem[41841] = 234511
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||||
mem[27387] = 2990
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||||
mem[24636] = 1269957
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mem[15638] = 428392
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mem[22064] = 272
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mask = 0XXX10X01011X011111000000XX0X100X010
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||||
mem[26764] = 482715793
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||||
mem[8422] = 70439
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mem[17857] = 28381730
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mem[4524] = 750659820
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mask = 11101100010100X1011000111000XX00X010
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||||
mem[52570] = 517468200
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mem[25263] = 11113122
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mem[33421] = 32762600
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mask = 11101X01XX1000010X10111000X1101X0X00
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||||
mem[16577] = 910
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mem[32450] = 16924479
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mem[4421] = 24801362
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mem[46638] = 8546454
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mask = 01X11X1101110101X1X1X010000XX101X001
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||||
mem[34209] = 24703796
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mem[30481] = 831
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mem[46487] = 147322
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mem[38619] = 11686
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mem[26615] = 1174
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mask = 010X0X00110100X1XX000010110XX100X001
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||||
mem[53587] = 198046
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mem[38420] = 22334
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mem[20181] = 962
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mask = XX101101X01000010XX01111001111010100
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||||
mem[33812] = 107321
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||||
mem[8613] = 7395
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||||
mem[1117] = 149990
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||||
mem[22919] = 23596
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||||
mask = 1X01110110010X01X100000001111011X010
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||||
mem[57800] = 254591077
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||||
mem[6633] = 60308580
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mem[8980] = 104196938
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||||
mem[5936] = 289911936
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||||
mem[44806] = 297364592
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||||
mask = 11X10XX0X1010X01010110XXX01111100X00
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||||
mem[49271] = 177794
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||||
mem[15368] = 259266583
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||||
mem[19327] = 590
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||||
mem[40243] = 24245
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||||
mem[57130] = 1201404
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mem[22545] = 1831196
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mem[59161] = 25210381
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mask = 0X101X11111X010111100X110XX11000X10X
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mem[38749] = 2091454
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||||
mem[45138] = 621877
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||||
mem[52107] = 3430339
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||||
mask = 0010X110X11X00101X100011XX111X000100
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||||
mem[17228] = 252642
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||||
mem[23892] = 13721
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||||
mem[43787] = 2786942
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||||
mem[55481] = 58875
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mem[513] = 892
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mem[62445] = 40312
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||||
mask = 0010X11XXX11001011X01010X0111110X100
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||||
mem[17415] = 7415167
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mem[9048] = 46059
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mem[2159] = 636711036
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mask = X010111X111X010X1110X10100XX1000X00X
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||||
mem[38420] = 104527
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||||
mem[24790] = 85
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mem[58634] = 127952377
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mem[8958] = 11672057
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||||
mask = X01X111X00X110XX0X10000000000X0X0100
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||||
mem[283] = 241
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||||
mem[8898] = 36719
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||||
mem[49134] = 217820
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||||
mem[31884] = 419937
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||||
mask = 0XX11110X1110X0101111000000100110X00
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||||
mem[27694] = 6848
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||||
mem[25843] = 331711
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mem[6688] = 581239
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||||
mem[41591] = 171
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||||
mask = 0100X100X1010X01010X001XX01XX1010101
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||||
mem[30429] = 1103121
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||||
mem[42192] = 7844667
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||||
mem[21668] = 51727200
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||||
mask = 001X1X10001X101XX1100X1000101100X010
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||||
mem[4322] = 157863993
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||||
mem[49962] = 9140
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||||
mem[16964] = 1599
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||||
mem[14443] = 2038
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||||
mem[3767] = 16636129
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||||
mem[13476] = 485497191
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||||
mem[1663] = 163345
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||||
mask = X101110111010101X1X10011001X10110000
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||||
mem[13172] = 195
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||||
mem[33921] = 5684133
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||||
mem[1337] = 51317
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||||
mask = X1XXX101110101X1010X0100XX111X101001
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||||
mem[63928] = 4636
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||||
mem[56436] = 3887978
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||||
mem[6185] = 3037
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||||
mem[7095] = 11521156
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||||
mem[1663] = 121401
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||||
mem[7218] = 20750
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||||
mask = 010001001X0101010X00001XXX100XX10100
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||||
mem[24149] = 309519
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||||
mem[16287] = 12731276
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||||
mem[29772] = 65227
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||||
mem[37172] = 2824
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||||
mem[17508] = 59271
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||||
mem[22133] = 3806
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||||
mask = 01X0X101011X000X0X101000100011111101
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||||
mem[14401] = 158547520
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||||
mem[37172] = 16841
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||||
mem[40439] = 461272566
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||||
mem[60909] = 478018315
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||||
mem[43219] = 2154608
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||||
mem[25369] = 46117
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||||
mem[54852] = 79656
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||||
mask = XX10111001X100X1X1100X1X0001110001X1
|
||||
mem[4213] = 900609324
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||||
mem[19327] = 28071
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||||
mem[30421] = 782
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||||
mem[4804] = 17293
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||||
mask = 0100X1000101X0010X010101X01000011001
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||||
mem[18139] = 1546181
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||||
mem[14021] = 33793814
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||||
mem[46699] = 2014
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||||
mem[51956] = 171606030
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||||
mem[29702] = 475302805
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||||
mem[18265] = 198549
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||||
mask = 0101X0110X1X0101X1X1X01101001X001XX1
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||||
mem[38962] = 132592128
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||||
mem[9436] = 7464578
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||||
mem[12650] = 49333
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||||
mem[8837] = 3234578
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||||
mask = 011X11101011X101111000XX001110001110
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||||
mem[61694] = 1206
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||||
mem[32263] = 20761769
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||||
mem[2116] = 193628
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||||
mem[13505] = 123039
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||||
mem[62164] = 14323289
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||||
mask = 1X101010100X0101X1110X01000101X00100
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||||
mem[21385] = 1022949
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||||
mem[51318] = 5667643
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||||
mem[17420] = 36980027
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||||
mem[29202] = 801
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||||
mask = 0101X01XX11X0101X10110X1010001001001
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||||
mem[15338] = 23103863
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||||
mem[10488] = 4521
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||||
mem[13172] = 17055515
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||||
mask = X10111X11X01X111X100000000111011X111
|
||||
mem[36577] = 397263
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||||
mem[8992] = 11944917
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||||
mem[22064] = 738796
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||||
mem[17310] = 1562710
|
||||
mem[30068] = 4950154
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||||
mask = 011111X10111X10X010X00X1X100X0010001
|
||||
mem[31166] = 6551
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||||
mem[62218] = 1528
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||||
mem[11467] = 35999360
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||||
mem[39578] = 11530695
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||||
mem[30855] = 27864
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||||
mem[18369] = 1610323
|
||||
mem[58953] = 12938251
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||||
mask = 01X111010X1111X0010X0XX010000X000111
|
||||
mem[15411] = 1096
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||||
mem[49541] = 3181
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||||
mem[23568] = 276408
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||||
mem[45168] = 1721
|
||||
mem[11394] = 155136
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||||
mask = 1111X1X011010001X101010X100XX11001X1
|
||||
mem[61945] = 26647548
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||||
mem[63262] = 110741
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||||
mem[33783] = 158
|
||||
mem[12753] = 200460
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||||
mem[43229] = 7579
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||||
mem[37084] = 26507
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||||
mask = 0100110011X10101010X00X01X11X1X10101
|
||||
mem[65089] = 636807464
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||||
mem[5775] = 4440830
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||||
mem[52107] = 69328099
|
||||
mem[38420] = 859060126
|
||||
mem[21272] = 1700
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||||
mem[12062] = 176162
|
||||
mem[12094] = 8733
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||||
mask = X100010111XX01X1X1010100X01101001X1X
|
||||
mem[44718] = 33650499
|
||||
mem[26507] = 165784650
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||||
mem[12622] = 2023
|
||||
mem[5651] = 120398699
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||||
mask = 110001011X010X0111X10X00011110001X00
|
||||
mem[44975] = 666498
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||||
mem[11614] = 751
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||||
mem[61354] = 5063
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||||
mem[4396] = 1131
|
||||
mem[25418] = 882
|
||||
mem[49245] = 64151
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||||
mask = 011X1X110111X1XX11X1100X01000X101001
|
||||
mem[59013] = 1141214
|
||||
mem[18016] = 95668408
|
||||
mem[30067] = 18132964
|
||||
mem[38900] = 286972459
|
||||
mem[42265] = 13529062
|
||||
mem[59369] = 6028326
|
||||
mask = 0110110X010100010XXX0X00X0011X101X1X
|
||||
mem[6479] = 8816055
|
||||
mem[28451] = 29446
|
||||
mem[61417] = 59156
|
||||
mem[6694] = 15597
|
||||
mem[29264] = 115437
|
||||
mask = 11110100110101011101XX0001X1X1110101
|
||||
mem[46886] = 114630
|
||||
mem[17383] = 452299
|
||||
mask = 010X110X11X10101000X001X011010000100
|
||||
mem[19215] = 487176198
|
||||
mem[59629] = 2120284
|
||||
mem[27009] = 3064
|
||||
mem[42335] = 22072
|
||||
mem[514] = 2010
|
||||
mask = 0100X1001101010X010000X0001000X00100
|
||||
mem[37232] = 2564
|
||||
mem[20561] = 29506163
|
||||
mem[27396] = 380700410
|
||||
mem[34075] = 868
|
||||
mem[24967] = 1882926
|
||||
mask = 010X1X01XX110111111X0XX0000X010X0101
|
||||
mem[61084] = 3068852
|
||||
mem[33028] = 188720342
|
||||
mem[17375] = 62850
|
||||
mask = X10X1X0X110101010X01001001101000X000
|
||||
mem[24149] = 1815
|
||||
mem[51489] = 197928369
|
||||
mem[27694] = 231814
|
||||
mem[11813] = 1002177793
|
||||
mem[526] = 104755102
|
||||
mem[22216] = 8396
|
||||
mask = 0110111101010001X1X0X11100X010001111
|
||||
mem[21083] = 2509191
|
||||
mem[13215] = 172339241
|
||||
mem[12386] = 106305632
|
||||
mask = X1X101X11101010101000X010X11101101X1
|
||||
mem[35709] = 64980388
|
||||
mem[51838] = 62510
|
||||
mem[48641] = 1174272
|
||||
mem[42157] = 149
|
||||
mask = 0X101100010100010X0X00X1100101111111
|
||||
mem[35807] = 1100541
|
||||
mem[10044] = 69616152
|
||||
mem[3047] = 142725213
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||||
mask = 11101X1X10X101010111X001XX10X0X00100
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||||
mem[38049] = 110
|
||||
mem[43097] = 14955394
|
||||
mem[61810] = 3545867
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||||
mem[61238] = 5370
|
||||
mem[20585] = 191903
|
||||
mem[26133] = 24248
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||||
mask = 010X110X011X00010110010100X0XXX1X011
|
||||
mem[15950] = 140910
|
||||
mem[12062] = 424527462
|
||||
mem[11876] = 236
|
||||
mem[5182] = 4776
|
||||
mem[50278] = 490
|
||||
mask = 010XX011011101X1110101110111110110X0
|
||||
mem[53736] = 2314
|
||||
mem[12633] = 5053
|
||||
mem[66] = 49557761
|
||||
mask = 01X01101X10101010101000X00111110100X
|
||||
mem[18849] = 911
|
||||
mem[20666] = 12891678
|
||||
mem[5609] = 10432
|
||||
mem[59720] = 22145720
|
||||
mem[17508] = 42631
|
||||
mem[8585] = 3448
|
||||
mask = 11X1X10X110101X101010X01X0011011X001
|
||||
mem[30601] = 9140827
|
||||
mem[30361] = 4166366
|
||||
mem[46057] = 16057
|
||||
mem[26983] = 251682577
|
||||
mem[63197] = 1603252
|
||||
mem[52893] = 462048575
|
||||
mask = 011011100111X00X11100X00100010001XXX
|
||||
mem[17534] = 25807901
|
||||
mem[4932] = 106350673
|
||||
mem[42192] = 735653575
|
||||
mem[10874] = 59007
|
||||
mask = 01000101110001X1XX001000001X1X011111
|
||||
mem[48049] = 386
|
||||
mem[1538] = 138451275
|
||||
mem[50333] = 15707
|
||||
mask = 0101100X01110111XX1X0000001011001X01
|
||||
mem[18139] = 102960
|
||||
mem[41277] = 5837
|
||||
mem[44484] = 29937
|
||||
mask = 11101XX10X1X0001011000100X010010X00X
|
||||
mem[30615] = 95201946
|
||||
mem[719] = 3697022
|
||||
mem[27391] = 150969140
|
||||
mem[62680] = 427952
|
||||
mem[7349] = 46922
|
||||
mem[17375] = 41348888
|
||||
mem[57800] = 1901
|
||||
mask = 0010X11X1X11X011111X0011001X01001111
|
||||
mem[46994] = 118757653
|
||||
mem[32947] = 23571
|
||||
mem[8653] = 1364
|
||||
mem[3767] = 6954112
|
||||
mask = 01001X0011010X000111X0X0X1X011011XXX
|
||||
mem[37908] = 88438829
|
||||
mem[20630] = 618075182
|
||||
mem[21520] = 101250753
|
||||
mem[10703] = 475904
|
||||
mask = 001001101XX10010111X1X10100111XX11X1
|
||||
mem[17310] = 2889476
|
||||
mem[2725] = 463419
|
||||
mem[65001] = 910330085
|
||||
mask = X1011011X111010101X110X1X1X0010110X0
|
||||
mem[15999] = 18586203
|
||||
mem[12825] = 51333145
|
||||
mem[29966] = 596120517
|
||||
mem[26866] = 141039
|
||||
mem[24223] = 415414
|
||||
mem[24403] = 16110598
|
||||
mask = 0XX00X01111X01110X011010101X01101010
|
||||
mem[43382] = 150995
|
||||
mem[28011] = 1021785
|
||||
mem[60339] = 7805893
|
||||
mem[37197] = 268431
|
||||
mem[17792] = 253366088
|
||||
mem[21437] = 24057926
|
||||
mask = XX1011X111100X00111X1100010111010011
|
||||
mem[18006] = 265940517
|
||||
mem[55921] = 1634
|
||||
mem[27656] = 17058
|
||||
mem[4911] = 3686
|
||||
mem[33243] = 8125794
|
||||
mem[47537] = 146165365
|
||||
mask = 110111011X01X1X10100X000010110111X0X
|
||||
mem[5775] = 176470
|
||||
mem[63017] = 24003454
|
||||
mask = 00011X001X11XX11111X01101010X0000010
|
||||
mem[1604] = 174349
|
||||
mem[42888] = 7159712
|
||||
mem[26615] = 1487
|
||||
mask = 01X11101100111111X000X1001110001011X
|
||||
mem[5344] = 8563500
|
||||
mem[21234] = 166162105
|
||||
mem[48935] = 10849963
|
||||
mask = 01000101XX0001111000XX0000X010010X00
|
||||
mem[24149] = 127627213
|
||||
mem[27338] = 43164114
|
||||
mem[47215] = 252815
|
||||
mem[47431] = 32732410
|
||||
mask = 01011100000100011X0X0XX101X111111100
|
||||
mem[13412] = 4193068
|
||||
mem[45046] = 148
|
||||
mem[63535] = 11659
|
||||
mem[6518] = 471308933
|
||||
mask = 111X111011X1X1X101111X000100001101X1
|
||||
mem[31114] = 118512878
|
||||
mem[41334] = 1604
|
||||
mem[7338] = 571
|
||||
mem[6001] = 4126415
|
||||
mem[5215] = 4392
|
||||
mem[47836] = 1862
|
||||
mem[22064] = 30804845
|
||||
mask = 0111010X11X1010X0101X1110011101X0111
|
||||
mem[13321] = 22426593
|
||||
mem[37095] = 5357
|
||||
mem[44281] = 467020
|
||||
mem[62680] = 2721559
|
||||
mask = 010001X0010100XX10010000011000101X00
|
||||
mem[30615] = 261491
|
||||
mem[31097] = 46202501
|
||||
mem[27880] = 6002395
|
||||
mem[51385] = 2780
|
||||
mem[51435] = 43181943
|
||||
mem[42192] = 107728750
|
||||
mask = 101011100X1100110X1X00X0101X10X11101
|
||||
mem[48366] = 859523
|
||||
mem[14111] = 859
|
||||
mem[21668] = 292390073
|
||||
mem[8073] = 858
|
||||
mem[12920] = 662378
|
||||
mask = X111X10011X10101X10101XX01111011X101
|
||||
mem[20630] = 4051571
|
||||
mem[55963] = 367
|
||||
mem[379] = 10962356
|
||||
mem[33028] = 37
|
||||
mem[24035] = 9459
|
||||
mem[50949] = 2030
|
||||
mask = 001011100X110X111X10101100011X010X11
|
||||
mem[8437] = 47226
|
||||
mem[41248] = 319
|
||||
mem[9624] = 3503
|
||||
mem[6875] = 5282
|
||||
mask = 11X111XX100101010100X01XX1X1001X1000
|
||||
mem[21292] = 1673693
|
||||
mem[51132] = 10346473
|
||||
mem[7504] = 4325
|
||||
mask = 111X010X1101011101X100010XX1X0111100
|
||||
mem[35415] = 6296
|
||||
mem[19215] = 1263591
|
||||
mem[49977] = 379136185
|
||||
mem[62950] = 28156510
|
||||
mem[8265] = 28662942
|
||||
mask = 01X110X01X1X0X11X1X00110000X01000100
|
||||
mem[54672] = 131784041
|
||||
mem[11394] = 24602
|
||||
mem[24646] = 10584
|
||||
mem[44349] = 4883
|
||||
mem[54743] = 2940969
|
||||
mem[8265] = 14841530
|
||||
mask = 0X10111X11100X0011X011XX00X011011010
|
||||
mem[49374] = 45910
|
||||
mem[25923] = 368017518
|
||||
mem[25114] = 8076340
|
||||
mem[62690] = 904875563
|
||||
mask = 010X11X0X1X1010X01010X01101001110101
|
||||
mem[39408] = 3080
|
||||
mem[6918] = 125955053
|
||||
mem[27880] = 29186
|
||||
mask = 01001101X101010X0101X1001111100010X1
|
||||
mem[11813] = 153838914
|
||||
mem[20585] = 1917
|
||||
mem[21385] = 1881773
|
||||
mem[8556] = 25758757
|
||||
mem[22435] = 802061
|
||||
mem[27631] = 13285866
|
||||
mask = 01101110111X0001011X10100X0100X10101
|
||||
mem[23441] = 186656612
|
||||
mem[2186] = 189388742
|
||||
mem[12866] = 874882
|
||||
mem[12947] = 23895
|
||||
mem[20630] = 77211
|
||||
mem[42083] = 63015239
|
||||
mem[51838] = 4984972
|
||||
mask = 00101110X111001X1X10001XX0X111XXX101
|
||||
mem[14789] = 244532376
|
||||
mem[21292] = 736136092
|
||||
mem[10874] = 513949
|
||||
mem[16755] = 12361
|
||||
mem[5416] = 22987
|
||||
mem[39578] = 106587
|
||||
mask = 010X11000X010001X1XXX0110011X1X1110X
|
||||
mem[43479] = 61
|
||||
mem[47199] = 15617564
|
||||
mem[18265] = 6027808
|
||||
133
2020/src/day14.rs
Normal file
133
2020/src/day14.rs
Normal file
@ -0,0 +1,133 @@
|
||||
//! --- Day 14: Docking Data ---
|
||||
//! As your ferry approaches the sea port, the captain asks for your help again. The computer system that runs this port isn't compatible with the docking program on the ferry, so the docking parameters aren't being correctly initialized in the docking program's memory.
|
||||
//!
|
||||
//! After a brief inspection, you discover that the sea port's computer system uses a strange bitmask system in its initialization program. Although you don't have the correct decoder chip handy, you can emulate it in software!
|
||||
//!
|
||||
//! The initialization program (your puzzle input) can either update the bitmask or write a value to memory. Values and memory addresses are both 36-bit unsigned integers. For example, ignoring bitmasks for a moment, a line like mem[8] = 11 would write the value 11 to memory address 8.
|
||||
//!
|
||||
//! The bitmask is always given as a string of 36 bits, written with the most significant bit (representing 2^35) on the left and the least significant bit (2^0, that is, the 1s bit) on the right. The current bitmask is applied to values immediately before they are written to memory: a 0 or 1 overwrites the corresponding bit in the value, while an X leaves the bit in the value unchanged.
|
||||
//!
|
||||
//! For example, consider the following program:
|
||||
//!
|
||||
//! mask = XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
|
||||
//! mem[8] = 11
|
||||
//! mem[7] = 101
|
||||
//! mem[8] = 0
|
||||
//! This program starts by specifying a bitmask (mask = ....). The mask it specifies will overwrite two bits in every written value: the 2s bit is overwritten with 0, and the 64s bit is overwritten with 1.
|
||||
//!
|
||||
//! The program then attempts to write the value 11 to memory address 8. By expanding everything out to individual bits, the mask is applied as follows:
|
||||
//!
|
||||
//! value: 000000000000000000000000000000001011 (decimal 11)
|
||||
//! mask: XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
|
||||
//! result: 000000000000000000000000000001001001 (decimal 73)
|
||||
//! So, because of the mask, the value 73 is written to memory address 8 instead. Then, the program tries to write 101 to address 7:
|
||||
//!
|
||||
//! value: 000000000000000000000000000001100101 (decimal 101)
|
||||
//! mask: XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
|
||||
//! result: 000000000000000000000000000001100101 (decimal 101)
|
||||
//! This time, the mask has no effect, as the bits it overwrote were already the values the mask tried to set. Finally, the program tries to write 0 to address 8:
|
||||
//!
|
||||
//! value: 000000000000000000000000000000000000 (decimal 0)
|
||||
//! mask: XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
|
||||
//! result: 000000000000000000000000000001000000 (decimal 64)
|
||||
//! 64 is written to address 8 instead, overwriting the value that was there previously.
|
||||
//!
|
||||
//! To initialize your ferry's docking program, you need the sum of all values left in memory after the initialization program completes. (The entire 36-bit address space begins initialized to the value 0 at every address.) In the above example, only two values in memory are not zero - 101 (at address 7) and 64 (at address 8) - producing a sum of 165.
|
||||
//!
|
||||
//! Execute the initialization program. What is the sum of all values left in memory after it completes?
|
||||
|
||||
use std::collections::HashMap;
|
||||
use std::str::FromStr;
|
||||
|
||||
use aoc_runner_derive::aoc;
|
||||
|
||||
#[derive(Default, Debug)]
|
||||
struct Mask {
|
||||
mask: usize,
|
||||
value: usize,
|
||||
}
|
||||
|
||||
impl FromStr for Mask {
|
||||
type Err = ();
|
||||
fn from_str(s: &str) -> Result<Mask, ()> {
|
||||
let mut mask = 0;
|
||||
let mut value = 0;
|
||||
s.bytes().for_each(|v| match v {
|
||||
b'X' => {
|
||||
mask <<= 1;
|
||||
mask |= 1;
|
||||
value <<= 1;
|
||||
}
|
||||
b'1' => {
|
||||
mask <<= 1;
|
||||
value <<= 1;
|
||||
value |= 1;
|
||||
}
|
||||
b'0' => {
|
||||
mask <<= 1;
|
||||
value <<= 1;
|
||||
}
|
||||
c => panic!(format!("Unhandled mask character '{}'", c)),
|
||||
});
|
||||
Ok(Mask { mask, value })
|
||||
}
|
||||
}
|
||||
|
||||
impl Mask {
|
||||
fn apply(&self, v: usize) -> usize {
|
||||
v & self.mask | self.value
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, Eq, PartialEq)]
|
||||
struct Address(usize);
|
||||
|
||||
impl FromStr for Address {
|
||||
type Err = ();
|
||||
fn from_str(s: &str) -> Result<Address, ()> {
|
||||
Ok(Address(
|
||||
s.strip_prefix("mem[")
|
||||
.ok_or(())?
|
||||
.strip_suffix("]")
|
||||
.ok_or(())?
|
||||
.parse()
|
||||
.map_err(|_| ())?,
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
#[aoc(day14, part1)]
|
||||
fn solution1(input: &str) -> usize {
|
||||
let mut mem: HashMap<usize, usize> = HashMap::new();
|
||||
let mut mask = Mask::default();
|
||||
|
||||
input.split('\n').for_each(|l| {
|
||||
let (cmd, arg) = l.split_at(l.find(" = ").expect("Couldn't find space wrapped ="));
|
||||
let arg = &arg[3..];
|
||||
match cmd {
|
||||
"mask" => mask = arg.parse().expect("Couldn't parse mask"),
|
||||
_ => {
|
||||
let addr: Address = cmd.parse().expect("Couldn't parse address");
|
||||
let val = mask.apply(arg.parse().expect("Couldn't pass arg"));
|
||||
mem.insert(addr.0, val);
|
||||
}
|
||||
};
|
||||
});
|
||||
|
||||
mem.values().fold(0, |acc, v| acc + v)
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
const INPUT: &'static str = r#"mask = XXXXXXXXXXXXXXXXXXXXXXXXXXXXX1XXXX0X
|
||||
mem[8] = 11
|
||||
mem[7] = 101
|
||||
mem[8] = 0"#;
|
||||
|
||||
#[test]
|
||||
fn test_solution1() {
|
||||
assert_eq!(solution1(INPUT), 165);
|
||||
}
|
||||
}
|
||||
@ -3,6 +3,7 @@ pub mod day10;
|
||||
pub mod day11;
|
||||
pub mod day12;
|
||||
pub mod day13;
|
||||
pub mod day14;
|
||||
pub mod day2;
|
||||
pub mod day3;
|
||||
pub mod day4;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user