day 5

input/2021/day5-sample1.txt

@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2

input/2021/day5.txt

@@ -0,0 +1,500 @@
+491,392 -> 34,392
+337,52 -> 485,52
+256,605 -> 256,959
+889,142 -> 153,878
+189,59 -> 512,382
+399,193 -> 598,193
+578,370 -> 795,153
+79,450 -> 569,450
+565,444 -> 270,149
+39,28 -> 39,846
+114,353 -> 114,383
+356,61 -> 356,327
+140,132 -> 515,132
+361,848 -> 361,527
+466,257 -> 466,784
+818,397 -> 818,14
+693,554 -> 693,984
+171,290 -> 171,655
+989,889 -> 170,70
+527,855 -> 527,549
+209,355 -> 486,355
+800,430 -> 291,939
+980,38 -> 31,987
+964,559 -> 964,799
+491,612 -> 930,173
+57,977 -> 958,76
+149,465 -> 349,465
+512,624 -> 629,507
+460,943 -> 460,441
+988,29 -> 988,968
+104,337 -> 441,337
+939,48 -> 939,546
+941,904 -> 498,461
+850,972 -> 649,771
+840,901 -> 23,84
+231,790 -> 231,873
+230,668 -> 840,58
+410,922 -> 435,897
+341,337 -> 341,406
+264,752 -> 258,752
+457,969 -> 457,757
+465,42 -> 465,350
+748,783 -> 502,783
+461,930 -> 461,142
+392,265 -> 215,265
+417,805 -> 417,231
+825,870 -> 60,105
+524,167 -> 703,346
+963,829 -> 308,174
+730,361 -> 730,252
+61,373 -> 61,593
+873,893 -> 132,152
+820,719 -> 417,719
+142,238 -> 212,168
+142,653 -> 676,119
+392,955 -> 392,453
+368,385 -> 414,385
+464,762 -> 592,762
+542,168 -> 542,789
+622,693 -> 166,237
+477,290 -> 792,290
+731,56 -> 731,677
+516,77 -> 326,77
+595,973 -> 779,973
+68,487 -> 128,487
+389,738 -> 762,738
+721,13 -> 827,119
+797,625 -> 347,625
+75,67 -> 75,458
+931,142 -> 219,854
+422,835 -> 980,835
+278,565 -> 753,565
+225,970 -> 806,389
+791,725 -> 691,725
+924,975 -> 18,69
+326,763 -> 969,120
+663,895 -> 663,559
+940,965 -> 142,167
+146,425 -> 791,425
+832,968 -> 272,408
+494,804 -> 694,804
+23,25 -> 900,902
+621,163 -> 894,163
+587,605 -> 587,716
+41,931 -> 383,589
+888,530 -> 341,530
+292,801 -> 292,567
+537,213 -> 245,213
+513,84 -> 527,84
+623,516 -> 623,128
+549,729 -> 509,729
+576,232 -> 869,232
+513,847 -> 433,847
+536,612 -> 434,612
+608,377 -> 33,952
+137,762 -> 424,475
+329,286 -> 584,541
+493,296 -> 493,316
+160,343 -> 189,343
+477,929 -> 976,430
+695,607 -> 557,607
+745,322 -> 28,322
+777,73 -> 76,774
+163,723 -> 163,816
+30,549 -> 63,516
+163,914 -> 898,179
+603,823 -> 603,78
+498,616 -> 886,228
+229,591 -> 341,591
+742,841 -> 343,841
+720,808 -> 934,808
+985,48 -> 48,985
+368,859 -> 178,859
+506,30 -> 144,30
+19,110 -> 19,750
+293,689 -> 293,294
+13,462 -> 980,462
+536,963 -> 346,773
+836,471 -> 462,471
+506,952 -> 489,952
+830,15 -> 461,15
+392,378 -> 237,378
+295,48 -> 295,825
+264,679 -> 264,602
+487,582 -> 487,116
+832,677 -> 788,677
+469,770 -> 211,512
+400,773 -> 394,773
+262,836 -> 262,454
+51,17 -> 969,935
+483,525 -> 838,880
+71,124 -> 164,31
+103,226 -> 912,226
+785,169 -> 785,454
+858,825 -> 176,143
+248,960 -> 427,781
+255,37 -> 767,37
+832,149 -> 506,149
+256,246 -> 86,246
+447,448 -> 765,448
+654,159 -> 654,158
+120,500 -> 120,341
+200,19 -> 839,658
+451,251 -> 763,563
+931,75 -> 931,312
+69,404 -> 311,646
+31,678 -> 31,231
+410,307 -> 410,236
+988,976 -> 387,375
+654,402 -> 738,486
+30,942 -> 942,30
+115,652 -> 98,669
+405,764 -> 375,734
+88,759 -> 125,759
+636,835 -> 722,835
+300,60 -> 126,60
+159,225 -> 159,319
+934,188 -> 934,74
+46,822 -> 708,160
+605,612 -> 605,463
+200,281 -> 536,617
+392,11 -> 79,324
+917,126 -> 258,785
+803,143 -> 803,180
+116,556 -> 651,556
+922,222 -> 468,676
+266,782 -> 896,782
+733,448 -> 764,448
+915,75 -> 305,685
+150,243 -> 842,243
+485,641 -> 963,641
+965,206 -> 965,275
+78,868 -> 748,198
+37,947 -> 859,947
+429,289 -> 429,48
+378,261 -> 378,624
+768,494 -> 768,782
+702,566 -> 113,566
+290,148 -> 913,771
+806,931 -> 849,931
+725,970 -> 299,970
+38,565 -> 740,565
+262,730 -> 973,730
+826,376 -> 826,97
+318,576 -> 318,227
+159,868 -> 448,868
+344,256 -> 344,615
+824,188 -> 588,424
+505,843 -> 897,843
+293,348 -> 293,488
+433,833 -> 165,565
+56,471 -> 169,471
+77,896 -> 914,59
+405,904 -> 405,174
+274,364 -> 274,88
+785,704 -> 538,704
+877,389 -> 681,389
+790,936 -> 327,936
+89,143 -> 755,809
+721,450 -> 721,406
+253,664 -> 811,664
+881,143 -> 97,927
+205,738 -> 645,738
+869,951 -> 282,364
+374,697 -> 374,592
+251,989 -> 251,977
+521,187 -> 885,187
+536,401 -> 536,38
+636,840 -> 636,873
+695,333 -> 52,976
+790,757 -> 790,358
+314,765 -> 882,765
+880,439 -> 127,439
+266,848 -> 810,304
+802,419 -> 802,936
+554,67 -> 554,956
+311,379 -> 685,753
+183,544 -> 305,544
+857,341 -> 407,791
+306,559 -> 727,980
+184,477 -> 509,152
+934,174 -> 934,154
+28,12 -> 28,968
+418,984 -> 112,678
+788,89 -> 837,89
+229,425 -> 192,462
+714,701 -> 424,411
+198,313 -> 156,355
+142,742 -> 215,742
+15,639 -> 15,787
+573,396 -> 462,396
+954,977 -> 76,99
+645,448 -> 652,448
+958,822 -> 376,240
+47,359 -> 212,194
+524,366 -> 524,916
+100,977 -> 501,576
+932,148 -> 115,965
+854,120 -> 421,553
+318,630 -> 318,964
+196,31 -> 874,709
+812,826 -> 812,679
+111,890 -> 897,104
+46,35 -> 972,35
+40,842 -> 40,835
+390,510 -> 98,510
+832,57 -> 124,765
+422,331 -> 422,44
+696,837 -> 696,555
+849,571 -> 849,679
+598,143 -> 598,261
+670,745 -> 670,757
+660,390 -> 660,912
+960,578 -> 960,253
+123,343 -> 123,28
+643,199 -> 969,199
+66,642 -> 669,39
+776,30 -> 776,173
+595,951 -> 84,951
+908,183 -> 724,367
+330,332 -> 330,455
+954,955 -> 188,955
+981,269 -> 90,269
+235,579 -> 513,579
+217,25 -> 217,990
+811,810 -> 811,405
+245,255 -> 367,255
+860,225 -> 860,100
+753,626 -> 697,626
+755,404 -> 836,404
+733,476 -> 336,476
+562,172 -> 964,172
+339,989 -> 749,989
+167,581 -> 167,611
+217,475 -> 217,747
+103,598 -> 431,270
+11,989 -> 989,11
+925,90 -> 46,969
+26,963 -> 935,54
+40,925 -> 40,816
+67,942 -> 984,25
+933,652 -> 933,242
+942,292 -> 942,138
+889,909 -> 180,200
+604,770 -> 237,770
+30,627 -> 973,627
+750,777 -> 750,645
+254,797 -> 254,169
+939,167 -> 347,759
+889,682 -> 394,682
+788,338 -> 388,338
+757,252 -> 169,252
+806,131 -> 699,131
+562,270 -> 562,481
+950,349 -> 459,840
+219,915 -> 932,202
+977,505 -> 977,708
+915,559 -> 915,125
+366,397 -> 366,717
+54,723 -> 433,723
+570,842 -> 236,508
+513,365 -> 513,80
+569,523 -> 569,266
+278,764 -> 278,178
+136,136 -> 84,84
+787,108 -> 787,809
+461,388 -> 855,782
+64,898 -> 848,114
+628,71 -> 178,521
+842,66 -> 842,699
+293,68 -> 742,68
+960,102 -> 358,704
+834,669 -> 27,669
+11,43 -> 374,406
+399,803 -> 340,803
+564,211 -> 20,755
+370,841 -> 370,321
+518,590 -> 518,255
+470,150 -> 470,850
+769,182 -> 234,717
+97,787 -> 97,382
+36,31 -> 982,977
+831,467 -> 471,827
+253,836 -> 547,836
+957,681 -> 957,919
+768,831 -> 768,275
+98,36 -> 955,893
+283,413 -> 840,413
+21,870 -> 20,870
+979,507 -> 979,37
+339,757 -> 210,757
+388,594 -> 801,594
+867,939 -> 91,163
+755,864 -> 755,501
+856,177 -> 736,57
+74,365 -> 376,63
+386,451 -> 815,22
+389,883 -> 679,593
+116,216 -> 157,175
+693,960 -> 693,454
+704,962 -> 306,962
+613,442 -> 867,442
+578,13 -> 578,855
+417,683 -> 118,683
+127,161 -> 742,161
+646,979 -> 646,270
+14,842 -> 14,802
+496,902 -> 506,912
+468,354 -> 468,875
+714,431 -> 714,172
+554,297 -> 554,790
+717,664 -> 883,664
+551,182 -> 980,611
+794,932 -> 499,637
+384,499 -> 507,499
+32,368 -> 257,368
+984,131 -> 904,131
+973,16 -> 10,979
+189,178 -> 189,752
+492,404 -> 492,593
+11,515 -> 117,515
+230,182 -> 230,954
+652,16 -> 663,16
+698,693 -> 490,693
+252,942 -> 587,942
+551,901 -> 428,778
+899,320 -> 903,316
+14,577 -> 313,278
+409,576 -> 409,475
+466,883 -> 819,883
+221,472 -> 609,472
+686,828 -> 686,720
+988,989 -> 13,14
+514,171 -> 227,171
+868,842 -> 632,842
+279,824 -> 697,406
+678,464 -> 678,687
+736,358 -> 736,259
+933,66 -> 24,975
+679,470 -> 679,689
+979,953 -> 45,19
+98,826 -> 737,187
+612,732 -> 612,681
+985,23 -> 23,985
+787,732 -> 332,277
+660,211 -> 660,61
+395,19 -> 246,19
+129,876 -> 955,50
+676,246 -> 821,246
+980,26 -> 18,988
+142,945 -> 142,218
+165,240 -> 540,240
+941,522 -> 941,129
+876,274 -> 876,340
+627,782 -> 905,782
+928,235 -> 246,235
+336,449 -> 92,205
+748,62 -> 748,787
+804,725 -> 356,277
+910,89 -> 19,980
+391,99 -> 155,335
+608,127 -> 516,219
+337,255 -> 337,649
+818,831 -> 818,859
+146,204 -> 301,359
+629,646 -> 906,923
+87,860 -> 824,123
+613,867 -> 613,946
+286,339 -> 286,626
+942,120 -> 595,467
+35,207 -> 187,207
+684,559 -> 283,158
+48,768 -> 48,349
+656,965 -> 656,27
+865,341 -> 865,576
+218,786 -> 152,786
+697,69 -> 583,69
+790,79 -> 552,79
+310,547 -> 846,11
+428,809 -> 428,940
+664,829 -> 664,455
+265,775 -> 749,775
+362,221 -> 309,168
+437,253 -> 437,597
+601,324 -> 245,680
+24,69 -> 24,476
+420,344 -> 420,525
+215,866 -> 635,866
+926,770 -> 315,770
+413,650 -> 413,624
+751,765 -> 475,489
+673,709 -> 39,75
+230,689 -> 805,689
+31,209 -> 789,967
+698,255 -> 909,255
+641,752 -> 866,527
+346,780 -> 391,825
+328,905 -> 328,130
+628,674 -> 628,354
+666,110 -> 98,678
+846,651 -> 846,371
+28,946 -> 28,482
+289,844 -> 458,675
+605,602 -> 605,297
+355,217 -> 239,217
+453,96 -> 195,354
+988,90 -> 145,933
+801,194 -> 801,109
+894,708 -> 894,212
+177,447 -> 607,877
+824,391 -> 788,391
+386,940 -> 471,855
+703,425 -> 583,425
+848,110 -> 36,922
+603,596 -> 685,678
+584,458 -> 584,482
+464,903 -> 343,903
+888,413 -> 405,413
+320,185 -> 103,185
+475,458 -> 55,878
+371,843 -> 371,466
+785,507 -> 785,570
+904,553 -> 904,983
+872,600 -> 872,848
+296,693 -> 751,238
+490,488 -> 322,488
+37,371 -> 185,223
+238,618 -> 238,883
+232,89 -> 123,89
+20,14 -> 961,955
+794,318 -> 914,318
+407,499 -> 246,338
+641,514 -> 227,514
+284,210 -> 562,488
+164,566 -> 498,900
+20,825 -> 150,955
+235,384 -> 537,686
+151,116 -> 979,944
+697,133 -> 59,771
+212,226 -> 38,226
+523,527 -> 523,497
+119,493 -> 352,726
+927,157 -> 154,930
+336,149 -> 581,394
+103,580 -> 354,580
+891,494 -> 532,853
+22,272 -> 538,788
+544,296 -> 519,271
+821,382 -> 821,155
+501,807 -> 501,202
+588,76 -> 708,76
+773,681 -> 184,681
+754,936 -> 86,268
+582,972 -> 40,972
+530,458 -> 530,329
+109,433 -> 649,433
+411,215 -> 411,311
+433,568 -> 433,585
+232,504 -> 799,504
+72,442 -> 38,442

src/main/scala/de.qwertyuiop.aoc/2021/day5.scala

@@ -2,5 +2,44 @@ package de.qwertyuiop.aoc.`2021`
 
 import de.qwertyuiop.aoc.lib.*
 import cats.*, cats.implicits.given
+import Vectors.{*,given}
+import util.chaining.given
+
+extension (a: Int)
+  def <->(b: Int): Range.Inclusive = (a min b) to (a max b)
+
+case class Line(start: Vec2D[Int], end: Vec2D[Int]):
+  def contains(p: Vec2D[Int]): Boolean =
+    (start.x == end.x && start.x == p.x && (start.y <-> end.y).contains(p.y))
+    ||
+    (start.y == end.y && start.y == p.y && (start.x <-> end.x).contains(p.x))
+    ||
+    (start.x + start.y == end.x + end.y && p.x + p.y == end.x + end.y
+      && (start.y <-> end.y).contains(p.y) && (start.x <-> end.x).contains(p.x))
+    ||
+    (p.x - p.y == end.x - end.y
+      && (start.y <-> end.y).contains(p.y) && (start.x <-> end.x).contains(p.x))
+
+def day5(using InputSource): Unit =
+  val lines = input{ case s"$x1,$y1 -> $x2,$y2" => Line(Vec2D(x1.toInt,y1.toInt), Vec2D(x2.toInt,y2.toInt))}
+  val orthogonalLines = lines.filter(l => l.start.x == l.end.x || l.start.y == l.end.y)
+  val maxX = lines.flatMap(l => List(l.start.x, l.end.x)).max
+  val maxY = lines.flatMap(l => List(l.start.y, l.end.y)).max
+  println(dangerPoints(orthogonalLines, maxX, maxY))
+  println(dangerPoints(lines, maxX, maxY))
+
+
+def dangerPoints(lines: List[Line], maxX: Int, maxY: Int) = (
+  for
+    x <- 0 to maxX
+    y <- 0 to maxY
+  yield lines.count(_.contains(Vec2D(x,y)))
+).count(_ > 1)
+
+//debug output like in the description for part1
+def printLines(lines: List[Line], maxX: Int, maxY: Int): Unit =
+  for y <- 0 to maxY do
+    for x <- 0 to maxX do
+      print(lines.count(_.contains(Vec2D(x, y))).pipe(i => if i > 0 then i.toString else "."))
+    println()
 
-def day5(using InputSource): Unit = ???