4 files changed, 920 insertions, 0 deletions
diff --git a/2021/13/.gitignore b/2021/13/.gitignore
new file mode 100644
index 0000000..95a78b1
--- /dev/null
+++ b/2021/13/.gitignore
@@ -0,0 +1 @@
+puzzle-[12].awk
diff --git a/2021/13/Makefile b/2021/13/Makefile
new file mode 100644
index 0000000..4d4c975
--- /dev/null
+++ b/2021/13/Makefile
@@ -0,0 +1,8 @@
+all:
+	sed '/START PART 2/,/END PART 2/d' puzzles.awk >puzzle-1.awk
+	sed '/START PART 1/,/END PART 1/d' puzzles.awk >puzzle-2.awk
+	chmod +x puzzle-[12].awk
+
+.PHONY: clean run
+clean:
+	rm -f puzzle-[12].awk
diff --git a/2021/13/input b/2021/13/input
new file mode 100644
index 0000000..8e61984
--- /dev/null
+++ b/2021/13/input
@@ -0,0 +1,859 @@
+176,226
+749,474
+1218,784
+1193,451
+478,224
+1019,620
+865,667
+884,178
+622,505
+43,856
+475,619
+1295,96
+497,499
+589,326
+117,267
+559,361
+402,863
+1220,277
+167,617
+955,560
+1011,135
+311,618
+865,198
+855,761
+698,241
+180,786
+728,523
+832,222
+865,67
+1280,649
+155,844
+990,406
+688,505
+990,488
+1116,288
+1047,266
+181,408
+27,401
+883,257
+253,610
+1213,131
+967,395
+581,605
+316,302
+1260,425
+967,171
+721,774
+618,668
+604,51
+858,323
+520,553
+271,730
+749,567
+1274,892
+1054,102
+117,301
+201,598
+227,257
+1193,267
+146,658
+87,498
+1017,313
+1211,628
+118,668
+1059,259
+48,169
+698,292
+405,516
+676,110
+1101,667
+298,453
+251,119
+1046,529
+1245,774
+1019,722
+1009,365
+117,593
+27,469
+599,164
+915,775
+1088,91
+530,407
+124,571
+494,378
+97,59
+995,443
+311,49
+345,822
+175,469
+174,560
+427,66
+261,120
+371,38
+73,844
+145,637
+674,675
+1275,646
+787,44
+1074,57
+478,229
+1140,630
+999,51
+559,252
+30,649
+1256,182
+836,882
+801,679
+271,394
+176,665
+989,211
+887,533
+431,147
+760,539
+1207,523
+73,172
+786,690
+504,674
+1039,858
+1034,702
+540,277
+457,89
+393,436
+995,397
+728,371
+556,850
+180,747
+345,72
+887,361
+484,742
+692,598
+835,619
+1057,158
+1159,891
+412,201
+801,33
+391,628
+1116,736
+1240,344
+530,487
+667,397
+639,171
+880,168
+390,813
+788,176
+1250,793
+780,487
+445,667
+1217,857
+832,705
+42,763
+813,499
+700,444
+114,619
+1191,884
+119,10
+791,313
+917,436
+1243,343
+1290,513
+15,798
+728,75
+179,833
+683,873
+773,260
+830,271
+567,620
+610,450
+395,567
+231,361
+1135,469
+1278,46
+1136,399
+780,357
+403,567
+671,778
+343,51
+902,78
+676,241
+345,486
+504,224
+136,593
+458,400
+806,224
+274,873
+753,347
+591,714
+699,856
+966,427
+991,773
+169,859
+85,339
+817,175
+470,733
+932,52
+378,310
+164,694
+999,619
+552,168
+523,44
+807,303
+843,623
+999,299
+160,826
+97,723
+557,347
+790,553
+1143,617
+701,637
+1109,598
+1193,515
+418,505
+522,649
+184,733
+801,705
+227,42
+1255,235
+222,159
+92,784
+95,364
+912,344
+85,787
+1170,511
+756,809
+473,184
+226,731
+676,513
+1130,108
+251,775
+219,484
+219,708
+151,357
+1192,674
+360,505
+1267,486
+972,592
+626,221
+1268,292
+445,248
+830,495
+69,143
+401,485
+1213,884
+1175,313
+1241,303
+612,627
+634,676
+947,620
+729,498
+721,326
+1299,451
+544,537
+1079,306
+373,172
+1036,873
+519,357
+1163,203
+1197,268
+802,147
+95,585
+181,413
+858,213
+604,537
+452,323
+662,488
+276,401
+1178,357
+743,128
+236,57
+1210,309
+905,516
+99,492
+430,168
+1083,637
+706,625
+345,408
+569,555
+831,61
+32,400
+1208,352
+892,505
+97,884
+58,7
+227,852
+1143,572
+643,751
+311,548
+12,450
+276,394
+505,707
+370,355
+599,659
+445,67
+557,884
+1211,154
+1084,137
+1238,523
+551,747
+264,589
+755,850
+887,431
+311,845
+27,465
+254,814
+102,726
+10,750
+184,676
+676,784
+831,541
+1039,500
+937,172
+140,607
+831,353
+479,61
+264,813
+259,119
+840,733
+239,262
+1136,750
+68,341
+1275,248
+445,26
+766,537
+1265,396
+1098,53
+774,668
+50,537
+152,175
+118,674
+472,331
+1283,401
+1299,443
+1163,691
+1012,493
+909,50
+639,723
+870,393
+975,185
+1212,492
+229,777
+1310,172
+627,149
+42,292
+1206,287
+136,145
+97,131
+11,443
+671,171
+335,325
+686,549
+44,444
+1059,119
+1208,726
+197,420
+1120,301
+753,803
+1215,642
+975,709
+564,281
+197,474
+207,150
+805,707
+552,253
+144,563
+556,716
+1083,497
+503,357
+271,500
+1268,602
+145,215
+756,163
+290,296
+589,120
+1176,341
+691,198
+535,296
+962,625
+296,574
+555,873
+445,446
+171,722
+932,584
+944,401
+955,807
+580,479
+723,103
+355,334
+910,814
+73,624
+971,3
+698,653
+202,547
+1295,723
+1083,66
+283,436
+65,777
+295,738
+751,361
+1190,750
+519,177
+991,26
+494,826
+95,82
+1084,731
+1083,257
+1027,436
+1213,579
+75,150
+792,77
+518,77
+704,171
+72,523
+1116,158
+306,513
+388,65
+315,443
+97,619
+93,663
+282,892
+112,254
+134,647
+373,274
+113,268
+69,420
+151,751
+426,626
+1178,494
+473,486
+1211,413
+1119,465
+519,313
+691,795
+535,598
+170,712
+831,93
+1299,133
+1266,444
+937,786
+125,184
+718,813
+423,431
+229,290
+440,393
+1074,281
+1197,178
+965,72
+214,501
+263,621
+922,9
+788,649
+306,558
+909,284
+55,730
+1207,371
+1198,469
+994,302
+263,721
+311,299
+104,287
+550,355
+391,714
+216,331
+808,175
+1265,498
+694,855
+749,409
+746,613
+212,53
+378,584
+1026,355
+145,355
+425,604
+132,357
+557,507
+1047,621
+1159,3
+284,66
+1026,592
+28,553
+257,143
+470,228
+309,408
+315,497
+530,805
+882,611
+1113,420
+372,892
+1165,705
+892,11
+1236,479
+683,745
+20,513
+447,150
+753,507
+1290,558
+251,635
+721,120
+1193,739
+60,218
+309,486
+927,858
+509,705
+1178,537
+320,488
+1032,501
+618,598
+1034,500
+344,19
+763,858
+892,883
+1292,667
+561,679
+99,266
+774,226
+113,324
+627,877
+671,723
+907,567
+1056,841
+100,507
+253,64
+1237,605
+38,407
+1034,425
+654,172
+445,491
+348,625
+1233,128
+832,224
+445,448
+401,284
+140,511
+554,809
+1088,735
+567,498
+1116,437
+1135,751
+730,479
+581,50
+967,51
+709,745
+370,715
+32,46
+231,306
+209,739
+67,343
+837,315
+1196,723
+98,402
+1036,425
+98,850
+1233,340
+946,2
+1292,227
+1225,339
+920,529
+1283,465
+284,539
+1079,809
+868,53
+1059,567
+780,537
+171,172
+1215,812
+468,287
+1059,635
+401,50
+479,833
+999,49
+587,791
+611,486
+977,824
+343,52
+1303,284
+1017,784
+574,526
+1165,215
+127,722
+253,158
+512,228
+612,205
+643,397
+927,659
+1300,144
+1126,676
+1299,751
+80,424
+1200,537
+692,296
+535,436
+641,855
+919,714
+223,299
+725,591
+1213,723
+658,516
+838,331
+826,294
+1267,856
+470,653
+97,212
+837,710
+756,835
+831,425
+502,175
+290,2
+319,773
+1049,355
+919,833
+591,845
+373,786
+636,219
+540,802
+1257,597
+478,222
+298,1
+28,341
+850,9
+184,666
+251,327
+554,835
+995,891
+848,190
+1087,147
+1282,553
+152,560
+1236,415
+879,147
+674,219
+591,180
+370,144
+293,110
+1159,751
+940,592
+1073,830
+97,275
+503,21
+321,742
+1176,647
+1243,418
+107,858
+840,666
+281,219
+1265,189
+97,579
+291,620
+67,418
+749,679
+278,501
+272,182
+319,26
+1193,634
+6,488
+1001,408
+1131,61
+20,336
+666,750
+223,147
+1255,164
+1197,324
+20,241
+1139,722
+940,403
+627,45
+366,407
+363,172
+126,668
+1004,336
+711,164
+534,144
+773,525
+610,444
+520,647
+6,600
+455,133
+759,747
+766,357
+509,355
+759,147
+692,2
+1268,355
+530,313
+325,119
+117,379
+711,730
+753,91
+760,735
+1211,292
+775,296
+420,782
+338,592
+706,537
+465,697
+460,9
+503,143
+428,78
+1193,155
+1220,617
+1217,791
+528,226
+355,87
+1044,885
+801,579
+536,226
+145,539
+388,9
+551,147
+1155,844
+1012,45
+1260,619
+431,523
+1034,873
+84,873
+74,479
+691,696
+202,213
+229,499
+353,529
+643,451
+194,288
+169,35
+38,39
+93,499
+54,182
+966,19
+790,229
+170,630
+132,89
+1215,687
+1260,537
+1038,40
+175,21
+55,164
+425,731
+1101,739
+753,884
+793,107
+321,11
+922,829
+1081,499
+1079,85
+883,66
+194,736
+547,858
+356,893
+465,197
+540,275
+791,357
+522,89
+865,827
+38,597
+59,75
+135,313
+50,843
+749,215
+311,346
+378,52
+325,775
+775,744
+669,855
+683,149
+487,870
+1245,120
+1081,395
+769,122
+1282,445
+190,301
+1178,649
+946,892
+42,539
+1283,493
+209,369
+1196,171
+753,547
+529,184
+1146,200
+823,277
+647,284
+567,128
+107,36
+517,787
+423,361
+644,750
+1252,7
+333,294
+1217,26
+1303,610
+45,396
+175,61
+920,813
+952,544
+522,718
+848,359
+348,241
+1046,589
+263,861
+791,537
+356,1
+868,617
+1049,774
+823,572
+301,365
+634,381
+442,841
+1198,254
+27,493
+1283,849
+432,735
+33,558
+875,708
+38,855
+770,725
+263,609
+361,110
+1272,39
+729,172
+363,620
+1083,738
+908,31
+910,53
+848,862
+1178,89
+1010,369
+509,691
+72,11
+69,474
+676,676
+281,257
+1113,474
+544,357
+1174,593
+348,65
+38,465
+1260,394
+760,159
+145,189
+731,744
+266,885
+971,397
+181,481
+634,218
+103,523
+816,378
+1242,789
+145,257
+999,276
+1186,123
+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/2021/13/puzzles.awk b/2021/13/puzzles.awk
new file mode 100644
index 0000000..2450eab
--- /dev/null
+++ b/2021/13/puzzles.awk
@@ -0,0 +1,52 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN           { FS = ",|=" }
+/[0-9]+,[0-9]+/ { grid[$2][$1] = 1 }
+
+# START PART 1
+flag == 1 { next }
+# END PART 1
+
+/x/ {
+	for (y in grid) {
+		for (x in grid[y]) {
+			if (x * 1 > $2) {
+				delete grid[y][x]
+				grid[y][$2 - (x - $2)] = 1
+			}
+		}
+	}
+	# START PART 1
+	flag = 1
+	# END PART 1
+}
+
+/y/ {
+	for (y in grid) {
+		if (y * 1 > $2) {
+			for (x in grid[y]) {
+				delete grid[y][x]
+				grid[$2 - (y - $2)][x] = 1
+			}
+		}
+	}
+	# START PART 1
+	flag = 1
+	# END PART 1
+}
+
+END {
+	# START PART 1
+	for (y in grid) {
+		for (x in grid[y])
+			acc += grid[y][x]
+	}
+	print acc
+	# END PART 1 START PART 2
+	for (y = 0; y < 6; y++) {
+		for (x = 0; x < 29; x++)
+			printf grid[y][x] ? "█" : " "
+		print ""
+	}
+	# END PART 2
+}