2021 day5/rust: avoid nightly for line point iterator

2021/data/day3.expected

@@ -0,0 +1,2 @@
+3895776
+7928162

2021/data/day4.expected

@@ -0,0 +1,2 @@
+58374
+11377

2021/data/day4.input

@@ -0,0 +1,601 @@
+26,38,2,15,36,8,12,46,88,72,32,35,64,19,5,66,20,52,74,3,59,94,45,56,0,6,67,24,97,50,92,93,84,65,71,90,96,21,87,75,58,82,14,53,95,27,49,69,16,89,37,13,1,81,60,79,51,18,48,33,42,63,39,34,62,55,47,54,23,83,77,9,70,68,85,86,91,41,4,61,78,31,22,76,40,17,30,98,44,25,80,73,11,28,7,99,29,57,43,10
+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+ 9 39 28 56 57
+34 46 43 52 25
+
+67 11 21 53 60
+52 58 54 94 47
+84 46 72 81 16
+31 51 23 36 97
+80 43 75 99 79

2021/data/day5.expected

@@ -0,0 +1,2 @@
+5442
+19571

2021/data/day5.input

@@ -0,0 +1,500 @@
+62,963 -> 844,181
+58,85 -> 917,944
+137,76 -> 137,347
+453,125 -> 347,19
+178,65 -> 977,864
+447,360 -> 62,745
+723,326 -> 156,893
+47,497 -> 107,437
+387,491 -> 340,491
+58,477 -> 283,252
+86,351 -> 562,827
+215,172 -> 539,172
+496,801 -> 496,63
+546,412 -> 232,98
+621,807 -> 481,807
+471,20 -> 618,20
+175,283 -> 175,467
+19,283 -> 19,290
+159,137 -> 159,11
+593,181 -> 543,181
+167,976 -> 929,976
+730,782 -> 959,782
+713,285 -> 713,880
+583,144 -> 583,296
+39,61 -> 961,983
+778,81 -> 604,81
+70,560 -> 70,889
+85,129 -> 666,710
+689,688 -> 632,688
+76,52 -> 903,879
+510,543 -> 22,55
+510,935 -> 470,935
+780,357 -> 780,602
+440,349 -> 710,79
+934,801 -> 412,801
+979,25 -> 35,969
+379,527 -> 379,76
+243,524 -> 243,664
+534,945 -> 11,422
+198,367 -> 224,367
+871,451 -> 456,451
+226,231 -> 939,231
+686,354 -> 740,300
+543,68 -> 340,68
+506,160 -> 319,347
+177,25 -> 177,603
+337,450 -> 724,450
+421,519 -> 676,519
+858,976 -> 179,297
+236,222 -> 236,250
+254,242 -> 254,626
+859,243 -> 23,243
+89,982 -> 979,92
+58,758 -> 101,801
+930,483 -> 587,826
+667,717 -> 667,762
+512,816 -> 845,816
+17,501 -> 17,760
+345,61 -> 847,61
+531,840 -> 618,840
+67,748 -> 262,748
+548,461 -> 163,846
+934,142 -> 169,907
+119,931 -> 580,470
+769,916 -> 457,604
+587,458 -> 93,458
+109,850 -> 768,191
+225,129 -> 160,64
+544,163 -> 544,476
+304,594 -> 61,351
+510,396 -> 510,741
+772,210 -> 772,889
+867,415 -> 721,269
+466,266 -> 466,44
+305,609 -> 305,237
+563,962 -> 451,962
+566,402 -> 28,940
+889,717 -> 891,717
+754,545 -> 313,545
+930,976 -> 209,255
+70,911 -> 692,289
+737,37 -> 958,37
+652,566 -> 720,634
+776,551 -> 370,957
+484,476 -> 820,476
+119,420 -> 639,420
+394,964 -> 394,221
+340,767 -> 964,143
+715,289 -> 481,55
+236,389 -> 826,389
+747,642 -> 33,642
+583,351 -> 244,690
+609,17 -> 609,680
+460,365 -> 668,365
+519,180 -> 929,590
+206,45 -> 782,45
+507,185 -> 386,306
+16,12 -> 982,978
+31,348 -> 320,348
+54,975 -> 947,82
+844,714 -> 870,714
+677,965 -> 677,699
+387,699 -> 387,26
+329,479 -> 189,479
+970,708 -> 538,708
+565,434 -> 565,623
+748,737 -> 748,497
+255,984 -> 255,600
+146,59 -> 932,845
+191,929 -> 423,929
+316,409 -> 802,409
+208,560 -> 559,209
+885,237 -> 135,987
+477,486 -> 260,486
+845,59 -> 845,811
+225,369 -> 162,369
+858,678 -> 858,362
+162,972 -> 27,972
+828,26 -> 283,571
+670,48 -> 114,604
+732,487 -> 620,487
+570,575 -> 14,19
+113,203 -> 162,154
+374,702 -> 374,452
+850,575 -> 535,575
+841,133 -> 841,474
+976,960 -> 642,960
+177,428 -> 177,246
+969,289 -> 589,289
+787,842 -> 731,786
+743,709 -> 336,709
+15,914 -> 299,630
+863,952 -> 17,952
+586,889 -> 586,512
+442,128 -> 436,128
+633,367 -> 79,921
+21,990 -> 257,990
+829,297 -> 829,103
+975,633 -> 879,633
+946,887 -> 72,13
+531,720 -> 123,312
+84,954 -> 815,223
+989,982 -> 257,982
+669,417 -> 928,158
+128,935 -> 87,976
+692,850 -> 191,850
+686,856 -> 686,259
+135,396 -> 473,58
+837,206 -> 629,206
+751,227 -> 751,900
+190,617 -> 190,502
+850,265 -> 254,265
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+980,747 -> 465,232
+54,375 -> 439,375
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+533,219 -> 123,629
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+911,441 -> 911,160
+80,294 -> 80,527
+880,533 -> 590,533
+674,84 -> 674,670
+956,440 -> 554,842
+24,939 -> 890,73
+516,183 -> 145,554
+71,584 -> 71,766
+629,173 -> 643,187
+34,360 -> 639,965
+983,871 -> 983,682
+986,590 -> 986,327
+769,986 -> 130,986
+392,192 -> 70,192
+577,379 -> 635,379
+243,664 -> 162,664
+273,987 -> 273,192
+251,548 -> 558,855
+989,736 -> 989,611
+400,697 -> 134,431
+646,923 -> 646,841
+768,782 -> 386,782
+93,973 -> 939,127
+489,91 -> 489,551
+313,683 -> 248,748
+986,61 -> 201,846
+322,413 -> 737,413
+567,716 -> 567,614
+198,624 -> 439,624
+402,198 -> 147,453
+897,352 -> 897,298
+773,379 -> 773,19
+373,256 -> 931,814
+690,796 -> 543,796
+884,368 -> 464,368
+136,864 -> 622,378
+458,569 -> 458,254
+491,462 -> 491,412
+558,340 -> 73,340
+980,52 -> 980,605
+126,609 -> 390,345
+437,659 -> 17,659
+53,928 -> 982,928
+389,591 -> 389,832
+464,46 -> 464,754
+646,680 -> 646,988
+919,159 -> 109,969
+334,75 -> 219,75
+976,639 -> 976,685
+264,773 -> 128,773
+787,771 -> 699,771
+415,124 -> 549,124
+468,71 -> 468,701
+815,121 -> 797,121
+619,95 -> 610,104
+886,294 -> 120,294
+148,136 -> 148,314
+816,971 -> 454,971
+888,733 -> 431,733
+59,836 -> 840,55
+52,965 -> 962,55
+989,982 -> 19,12
+697,818 -> 185,306
+883,638 -> 481,638
+429,285 -> 170,26
+516,507 -> 516,301
+767,102 -> 61,808
+764,793 -> 209,238
+568,411 -> 261,718
+706,622 -> 685,622
+226,110 -> 790,674
+544,429 -> 544,334
+794,588 -> 794,792
+804,738 -> 782,738
+370,552 -> 370,189
+960,275 -> 644,275
+133,896 -> 686,896
+12,986 -> 987,11
+978,973 -> 69,64
+92,465 -> 62,465
+733,57 -> 18,57
+110,845 -> 110,272
+123,935 -> 123,499
+37,960 -> 986,11
+332,209 -> 344,221
+237,279 -> 349,279
+875,635 -> 875,420
+552,174 -> 552,635
+10,93 -> 853,936
+909,82 -> 909,926
+511,743 -> 511,830
+223,974 -> 223,124
+829,543 -> 11,543
+307,671 -> 206,570
+126,72 -> 956,72
+528,903 -> 528,223
+644,524 -> 952,216
+734,324 -> 734,105
+225,558 -> 225,159
+667,122 -> 667,64
+582,93 -> 582,509
+817,932 -> 727,932
+898,18 -> 79,837
+12,987 -> 986,13
+426,79 -> 722,79
+496,884 -> 906,884
+953,183 -> 953,508
+360,881 -> 975,881
+765,862 -> 579,862
+14,55 -> 14,560
+454,333 -> 290,333
+19,479 -> 91,551
+696,41 -> 56,41
+329,203 -> 812,203
+498,559 -> 498,636
+822,852 -> 614,852
+410,370 -> 410,624
+829,415 -> 805,415
+775,980 -> 204,980
+705,780 -> 116,191
+49,30 -> 988,969
+324,199 -> 554,199
+727,572 -> 157,572
+212,693 -> 93,693
+886,105 -> 152,105
+239,834 -> 958,115
+623,920 -> 623,523
+389,225 -> 106,508
+443,426 -> 443,108
+129,770 -> 858,41
+906,559 -> 392,559
+44,793 -> 774,793
+693,275 -> 693,738
+623,434 -> 184,873
+774,623 -> 774,895
+140,187 -> 140,238
+247,503 -> 45,301
+575,365 -> 950,365
+101,120 -> 646,120
+42,682 -> 649,75
+749,767 -> 516,534
+551,53 -> 73,531
+15,26 -> 885,896
+749,15 -> 235,529
+548,169 -> 784,405
+458,564 -> 962,564
+663,873 -> 678,873
+349,773 -> 349,927
+777,180 -> 637,320
+238,306 -> 844,912
+927,818 -> 652,543
+404,673 -> 952,125
+750,297 -> 18,297
+926,958 -> 926,669
+767,843 -> 767,833
+151,136 -> 234,219
+927,789 -> 468,330
+593,361 -> 593,447
+48,14 -> 954,920
+282,972 -> 790,972
+537,446 -> 202,446
+847,125 -> 357,615
+667,609 -> 299,609
+820,987 -> 359,987
+342,889 -> 595,889
+692,414 -> 239,414
+916,935 -> 70,89
+289,884 -> 289,790
+264,562 -> 373,562
+850,24 -> 126,748
+877,159 -> 213,823
+702,607 -> 702,454
+432,883 -> 432,260
+530,387 -> 229,387
+783,39 -> 783,933
+757,775 -> 757,81
+416,376 -> 474,376
+220,462 -> 220,824
+438,317 -> 421,317
+403,312 -> 866,312
+902,923 -> 204,923
+345,33 -> 819,33
+376,521 -> 549,521
+172,320 -> 129,277
+25,975 -> 976,24
+730,108 -> 465,373
+607,468 -> 737,598
+376,55 -> 672,55
+807,113 -> 974,113
+345,804 -> 695,454
+687,921 -> 650,884
+262,743 -> 262,753
+889,734 -> 499,344
+424,727 -> 909,242
+100,957 -> 100,832
+558,958 -> 376,958
+422,473 -> 539,356
+424,463 -> 158,463
+329,543 -> 816,543
+300,74 -> 362,136
+620,691 -> 620,312
+215,727 -> 360,582
+692,116 -> 618,116
+945,722 -> 945,560
+851,83 -> 450,484
+692,424 -> 254,862
+160,214 -> 160,405
+937,101 -> 854,184
+989,14 -> 18,985
+256,275 -> 828,847
+797,748 -> 509,748
+521,148 -> 422,148
+85,549 -> 85,807
+689,688 -> 443,442
+750,664 -> 648,562
+51,616 -> 51,54
+925,272 -> 925,696
+284,560 -> 369,560
+509,685 -> 509,559
+985,157 -> 273,869
+570,765 -> 614,721
+62,981 -> 985,58
+289,496 -> 289,104
+752,232 -> 692,292
+82,948 -> 683,948
+15,20 -> 984,989
+252,950 -> 252,132
+930,659 -> 614,659
+552,449 -> 798,695
+850,894 -> 342,386
+412,465 -> 412,383
+249,616 -> 351,718
+759,289 -> 613,289
+673,347 -> 673,842
+749,493 -> 449,493
+378,468 -> 378,674
+914,924 -> 890,900
+514,56 -> 606,56
+855,233 -> 979,233
+170,756 -> 170,961
+450,601 -> 450,87
+868,192 -> 125,935
+702,137 -> 231,608
+109,36 -> 632,36
+511,472 -> 511,945
+208,884 -> 923,169
+831,66 -> 146,66
+435,133 -> 884,133
+900,418 -> 916,418
+957,104 -> 127,104
+608,892 -> 608,40
+554,782 -> 55,782
+305,260 -> 305,712
+942,143 -> 226,859
+823,778 -> 317,778
+228,415 -> 228,445
+313,505 -> 669,505
+43,539 -> 43,187
+14,84 -> 743,813
+687,101 -> 277,101
+549,977 -> 549,392
+21,637 -> 214,637
+950,961 -> 104,115
+778,831 -> 958,831
+214,765 -> 579,765
+586,42 -> 89,42
+505,950 -> 505,115
+144,734 -> 144,813
+11,349 -> 11,681
+49,336 -> 99,386
+560,187 -> 560,551
+678,602 -> 761,519
+131,515 -> 411,795
+957,835 -> 957,106
+948,852 -> 948,990
+541,946 -> 541,405
+355,147 -> 724,516
+644,476 -> 625,476
+789,818 -> 207,236
+259,57 -> 431,57
+441,375 -> 441,34
+774,121 -> 882,13
+655,397 -> 188,864
+467,432 -> 235,200
+268,121 -> 268,842
+975,14 -> 11,978
+124,904 -> 935,93
+401,582 -> 420,582
+170,700 -> 523,347
+20,681 -> 20,174
+420,939 -> 173,692
+61,933 -> 956,38
+686,458 -> 686,939
+780,561 -> 305,86
+792,644 -> 792,780
+632,550 -> 938,550
+441,252 -> 841,252
+789,59 -> 789,418
+981,11 -> 278,714
+264,41 -> 264,186
+870,833 -> 605,568
+160,905 -> 160,783
+385,191 -> 385,403
+774,791 -> 69,86
+409,967 -> 409,173
+868,41 -> 868,235
+536,497 -> 949,497
+757,119 -> 156,720
+563,706 -> 883,706
+124,482 -> 14,482
+353,655 -> 904,104
+194,868 -> 194,649
+810,736 -> 748,736
+815,578 -> 50,578
+531,131 -> 241,131
+18,972 -> 977,13
+761,747 -> 73,59
+650,701 -> 930,701
+470,237 -> 470,740
+333,803 -> 954,182
+644,667 -> 235,667
+943,766 -> 299,766
+985,876 -> 985,503
+170,924 -> 467,924
+249,19 -> 981,751
+462,666 -> 462,651
+404,228 -> 877,228
+174,440 -> 174,847
+910,596 -> 672,596
+430,663 -> 734,663
+711,294 -> 69,294
+193,302 -> 257,302
+959,20 -> 13,966
+171,561 -> 171,953
+704,986 -> 29,311
+285,886 -> 285,260
+945,872 -> 531,458
+265,748 -> 478,748
+26,537 -> 26,851
+205,210 -> 917,922
+590,488 -> 241,139
+536,179 -> 247,179

2021/day1/day1_rs/src/main.rs

@@ -1,3 +1,4 @@
+#![warn(clippy::pedantic)]
 use itertools::Itertools;
 use std::io::{self, BufRead};
 
@@ -18,7 +19,7 @@ fn main() {
         count_increasing(
             numbers
                 .windows(3)
-                .map(|window| -> usize { window.iter().sum() })
+                .map(|window| window.iter().sum::<usize>())
         )
     );
 }

2021/day3/day3.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+import sys
+from collections import Counter
+
+def most_common(ns, pos):
+    c = Counter(n[pos] for n in ns)
+    num_zeros = c['0']
+    num_ones = c['1']
+    if num_ones >= num_zeros:
+        return '1'
+    else:
+        return '0'
+
+def least_common(ns, pos):
+    return '0' if most_common(ns, pos) == '1' else '1'
+
+def find_criteria(ns, criteria):
+    ns = ns
+    i = 0
+    while len(ns) > 1:
+        x = criteria(ns, i)
+        ns = [n for n in ns if n[i] == x]
+        i += 1
+    return ns[0]
+
+if __name__ == '__main__':
+    lines = [line.strip() for line in sys.stdin.readlines()]
+
+    line_len = len(lines[0])
+    gamma = ''.join(most_common(lines, n) for n in range(line_len))
+    epsilon = ''.join(least_common(lines, n) for n in range(line_len))
+    print(int(gamma, 2) * int(epsilon, 2))
+
+    oxygen_rating = find_criteria(lines, most_common)
+    co2_rating = find_criteria(lines, least_common)
+
+    print(int(oxygen_rating, 2) * int(co2_rating, 2))

2021/day3/day3_rs/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day3_rs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2021/day3/day3_rs/src/main.rs

@@ -0,0 +1,58 @@
+#![warn(clippy::pedantic)]
+use std::io::{stdin, BufRead};
+
+fn find_rating(num_bits: usize, mut range: &[usize], keep_most_common_bit: bool) -> usize {
+    for idx in (0..num_bits).rev() {
+        if range.len() == 1 {
+            break;
+        }
+
+        let nth_bit = |x| x >> idx & 1;
+        let partition_point = range.iter().position(|&n| nth_bit(n) == 1).unwrap();
+        let center_bit = nth_bit(range[range.len() / 2]);
+
+        let keep_first_half = if keep_most_common_bit {
+            center_bit == 0
+        } else {
+            center_bit == 1
+        };
+
+        if keep_first_half {
+            range = &range[..partition_point];
+        } else {
+            range = &range[partition_point..];
+        }
+    }
+
+    range[0]
+}
+
+fn main() {
+    let lines: Vec<_> = stdin().lock().lines().map(Result::unwrap).collect();
+
+    let num_bits = lines[0].len();
+
+    let gamma: usize = (0..num_bits)
+        .map(|i| {
+            lines
+                .iter()
+                .filter(|line| line.chars().nth(i).unwrap() == '1')
+                .count()
+        })
+        .map(|n| if n > lines.len() / 2 { 1 } else { 0 })
+        .reduce(|accum, bit| accum << 1 | bit)
+        .unwrap();
+    let sigma = !gamma & ((1 << num_bits) - 1);
+
+    println!("{}", gamma * sigma);
+
+    let mut numbers: Vec<_> = lines
+        .iter()
+        .map(|n| usize::from_str_radix(n, 2).unwrap())
+        .collect();
+    numbers.sort_unstable();
+
+    let oxygen = find_rating(num_bits, &numbers, true);
+    let co2 = find_rating(num_bits, &numbers, false);
+    println!("{}", oxygen * co2);
+}

2021/day4/day4.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+import time
+
+import sys
+
+def board_won(board):
+    for row in board:
+        if all(x is None for x in row):
+            return True
+    for i in range(len(board[0])):
+        if all(row[i] is None for row in board):
+            return True
+    return False
+
+if __name__ == '__main__':
+    lines = [line.strip() for line in sys.stdin.readlines()]
+
+    draws = [int(n) for n in lines[0].split(',')]
+
+    boards = []
+    for i in range(2, len(lines), 6):
+        boards.append([[int(n) for n in line.split()] for line in lines[i:i+5]])
+
+    wins = []
+    for draw in draws:
+        for board_idx, board in enumerate(boards):
+            if board is None:
+                continue
+            for row in board:
+                try:
+                    idx = row.index(draw)
+                    row[idx] = None
+                except ValueError:
+                    pass
+            if board_won(board):
+                wins.append(draw * sum(n for row in board for n in row if n is not None))
+                boards[board_idx] = None
+
+    print(wins[0])
+    print(wins[-1])

2021/day5/day5_rs/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day5_rs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+vector2d = "2.2.0"

2021/day5/day5_rs/src/main.rs

@@ -0,0 +1,114 @@
+#![warn(clippy::pedantic)]
+use std::{
+    convert::Infallible,
+    io::{stdin, BufRead},
+    str::FromStr,
+};
+use vector2d::Vector2D;
+
+#[derive(Copy, Clone, Debug)]
+struct Line {
+    start: Vector2D<usize>,
+    end: Vector2D<usize>,
+}
+
+impl Line {
+    pub fn is_straight(&self) -> bool {
+        self.start.x == self.end.x || self.start.y == self.end.y
+    }
+
+    pub fn expand(&self) -> impl Iterator<Item = Vector2D<usize>> {
+        LinePoints::new(self)
+    }
+}
+
+impl FromStr for Line {
+    type Err = Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let parts: Vec<_> = s.split(' ').collect();
+        let start: Vec<_> = parts[0].split(',').map(|n| n.parse().unwrap()).collect();
+        let end: Vec<_> = parts[2].split(',').map(|n| n.parse().unwrap()).collect();
+
+        Ok(Line {
+            start: Vector2D::new(start[0], start[1]),
+            end: Vector2D::new(end[0], end[1]),
+        })
+    }
+}
+
+struct LinePoints {
+    pos: Vector2D<isize>,
+    step: Vector2D<isize>,
+    points_left: usize,
+}
+
+impl LinePoints {
+    fn new(line: &Line) -> Self {
+        let start = line.start.as_isizes();
+        let end = line.end.as_isizes();
+        let delta = end - start;
+        let step = Vector2D::new(delta.x.signum(), delta.y.signum());
+
+        let len = usize::max(delta.x.unsigned_abs(), delta.y.unsigned_abs());
+
+        Self {
+            pos: start,
+            step,
+            points_left: len + 1,
+        }
+    }
+}
+
+impl Iterator for LinePoints {
+    type Item = Vector2D<usize>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.points_left == 0 {
+            return None;
+        }
+
+        let current = self.pos;
+        self.pos += self.step;
+        self.points_left -= 1;
+        Some(current.as_usizes())
+    }
+}
+
+fn count_overlaps<'a>(it: impl IntoIterator<Item = &'a Line>) -> usize {
+    let points: Vec<(usize, usize)> = it
+        .into_iter()
+        .flat_map(Line::expand)
+        .map(Into::into)
+        .collect();
+
+    let (max_x, max_y) = points.iter().fold((0, 0), |(acc_x, acc_y), &(x, y)| {
+        (usize::max(acc_x, x), usize::max(acc_y, y))
+    });
+
+    let mut field = vec![vec![0_usize; max_y + 1]; max_x + 1];
+
+    let mut hits = 0;
+    for (x, y) in points {
+        let point = &mut field[x][y];
+        if *point == 1 {
+            hits += 1;
+        }
+        *point += 1;
+    }
+    hits
+}
+
+fn main() {
+    let lines: Vec<Line> = stdin()
+        .lock()
+        .lines()
+        .map(|s| s.unwrap().parse().unwrap())
+        .collect();
+
+    println!(
+        "{}",
+        count_overlaps(lines.iter().filter(|line| line.is_straight()))
+    );
+    println!("{}", count_overlaps(&lines));
+}