From 7a47ce953ce4ae63cf1b6a378054e9127a9f4df8 Mon Sep 17 00:00:00 2001
From: Luke Else <mail@luke-else.co.uk>
Date: Tue, 14 Dec 2021 21:20:27 +0000
Subject: [PATCH] day 13a complete

---
 day13/day 13a/main.go |  85 +++-
 day13/input           | 951 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 1018 insertions(+), 18 deletions(-)

diff --git a/day13/day 13a/main.go b/day13/day 13a/main.go
index 2c4f028..220efa2 100644
--- a/day13/day 13a/main.go	
+++ b/day13/day 13a/main.go	
@@ -5,19 +5,93 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 )
 
 func main() {
 	content := returnContent("../input")
 	//content := returnContent("testInput")
 
+	sheet := make(map[Coordinate]bool)
+	answer := 0
+
+	for _, line := range *content {
+
+		if strings.HasPrefix(line, "fold") {
+			//Fold instructions
+			instruction := strings.Split(line, "=")
+
+			if strings.Contains(instruction[0], "x") {
+				foldPoint, _ := strconv.Atoi(instruction[1])
+				sheet = FoldX(sheet, foldPoint)
+			}
+
+			if strings.Contains(instruction[0], "y") {
+				foldPoint, _ := strconv.Atoi(instruction[1])
+				sheet = FoldY(sheet, foldPoint)
+			}
+
+			//Only want to consider the first instruction
+			//Break means that we don't end up processing the further folds
+			break
+
+		} else if line != "" {
+			//mapping instructions
+			coordinates := strings.Split(line, ",")
+			x, _ := strconv.Atoi(coordinates[0])
+			y, _ := strconv.Atoi(coordinates[1])
+
+			sheet[Coordinate{X: x, Y: y}] = true
+
+		}
+	}
+
+	for range sheet {
+		answer++
+	}
+
+	fmt.Println(answer)
+
 }
 
-func returnContent(path string) *[][]int {
+func FoldX(sheet map[Coordinate]bool, foldPoint int) (folded map[Coordinate]bool) {
+	folded = make(map[Coordinate]bool)
+	for mark := range sheet {
+		x := mark.X
+		if x > foldPoint {
+			//If the value is in the region that gets folded
+			x = 2*foldPoint - x
+		}
+
+		folded[Coordinate{X: x, Y: mark.Y}] = true
+	}
+	return
+}
+
+func FoldY(sheet map[Coordinate]bool, foldPoint int) (folded map[Coordinate]bool) {
+	folded = make(map[Coordinate]bool)
+	for mark := range sheet {
+		y := mark.X
+		if y > foldPoint {
+			//If the value is in the region that gets folded
+			y = 2*foldPoint - y
+		}
+
+		folded[Coordinate{X: mark.X, Y: y}] = true
+	}
+	return
+}
+
+type Coordinate struct {
+	X int
+	Y int
+}
+
+func returnContent(path string) *[]string {
 	//read file and return it as an array of integers
 
 	file, err := os.Open(path)
-	var content [][]int
+	var content []string
 
 	if err != nil {
 		fmt.Println("Unlucky, the file didn't open")
@@ -28,12 +102,7 @@ func returnContent(path string) *[][]int {
 	scanner := bufio.NewScanner(file)
 
 	for scanner.Scan() {
-		nums := []int{}
-		for _, char := range scanner.Text() {
-			num, _ := strconv.Atoi(string(char))
-			nums = append(nums, num)
-		}
-		content = append(content, nums)
+		content = append(content, scanner.Text())
 	}
 
 	return &content
diff --git a/day13/input b/day13/input
index 67b8a5a..ff66650 100644
--- a/day13/input
+++ b/day13/input
@@ -1,10 +1,941 @@
-5421451741
-3877321568
-7583273864
-3451717778
-2651615156
-6377167526
-5182852831
-4766856676
-3437187583
-3633371586
\ No newline at end of file
+92,632
+795,9
+1034,368
+1230,233
+969,816
+1218,526
+971,780
+139,417
+892,313
+1196,196
+1091,70
+728,747
+632,10
+1089,247
+70,159
+492,375
+919,581
+304,469
+736,431
+7,630
+457,879
+174,567
+328,773
+207,714
+361,452
+77,151
+907,298
+325,838
+956,644
+272,52
+259,794
+254,847
+517,851
+669,516
+746,275
+1146,801
+1019,297
+679,43
+517,416
+703,814
+90,201
+206,74
+239,794
+1120,114
+197,711
+1247,131
+239,71
+418,805
+129,757
+1195,56
+895,598
+975,712
+57,171
+656,746
+984,177
+1,182
+785,457
+810,107
+703,278
+699,593
+795,477
+67,750
+190,616
+1,712
+162,438
+1079,432
+1010,868
+431,30
+293,9
+957,518
+452,634
+1245,452
+631,87
+395,200
+721,284
+1143,198
+669,378
+1205,827
+974,483
+33,588
+894,7
+1064,245
+1099,616
+1307,248
+63,234
+249,71
+919,182
+589,284
+730,152
+251,298
+644,78
+731,148
+669,638
+663,712
+356,824
+960,873
+1139,602
+902,404
+785,728
+830,434
+691,207
+118,567
+927,742
+436,556
+946,866
+1235,746
+433,647
+1266,103
+267,775
+796,581
+474,219
+686,582
+982,354
+897,263
+398,626
+689,687
+1184,294
+403,374
+303,135
+1168,670
+1275,562
+1000,812
+974,411
+785,309
+1019,108
+189,551
+969,857
+401,549
+574,873
+73,885
+417,406
+1029,584
+345,626
+238,887
+103,847
+1006,21
+919,712
+256,268
+13,773
+1093,644
+1230,890
+858,260
+1010,196
+1002,341
+761,807
+1034,526
+661,318
+381,390
+1111,597
+1161,65
+1258,152
+1031,56
+393,890
+683,752
+22,621
+671,49
+972,31
+581,574
+1163,145
+1051,694
+805,513
+1119,28
+1051,794
+1288,884
+1092,226
+152,270
+174,327
+266,151
+763,863
+733,151
+1292,105
+55,47
+663,630
+190,780
+1170,537
+177,381
+550,390
+251,150
+23,43
+1007,135
+386,726
+431,847
+1079,24
+171,574
+997,212
+1056,89
+1238,257
+74,775
+152,119
+344,107
+833,793
+1146,737
+972,150
+107,600
+505,605
+1124,273
+474,194
+17,380
+492,823
+1309,712
+719,131
+830,460
+1237,574
+1180,28
+808,176
+507,98
+339,114
+155,261
+318,859
+335,824
+919,548
+920,497
+1074,413
+1221,233
+118,103
+1079,14
+673,518
+761,197
+289,96
+602,294
+1064,218
+549,197
+1091,600
+375,80
+691,625
+965,268
+574,469
+890,191
+796,89
+547,415
+3,248
+858,95
+162,71
+748,526
+222,392
+994,526
+803,796
+868,565
+218,42
+293,718
+763,31
+1222,742
+279,56
+966,107
+74,791
+455,177
+507,796
+1071,71
+875,518
+499,875
+177,45
+1258,70
+659,248
+467,750
+1044,151
+244,714
+1260,480
+576,476
+212,26
+181,156
+1071,346
+239,598
+893,406
+666,658
+1086,401
+114,565
+171,633
+103,495
+290,476
+1098,420
+1268,148
+582,257
+408,452
+310,787
+435,376
+991,824
+1130,518
+333,514
+1148,413
+90,649
+649,457
+326,298
+1155,875
+607,814
+868,329
+1302,859
+1048,532
+259,884
+1006,469
+1155,712
+587,122
+868,250
+1155,261
+328,705
+604,414
+271,175
+974,247
+621,687
+1054,211
+298,70
+647,793
+857,432
+293,207
+190,838
+842,173
+238,439
+113,383
+938,530
+11,114
+1074,295
+736,661
+1193,666
+364,642
+525,728
+405,590
+1089,199
+199,877
+1206,726
+835,301
+621,400
+1111,297
+1238,637
+580,551
+969,37
+945,768
+189,343
+164,737
+890,703
+661,514
+820,317
+13,170
+219,175
+551,847
+512,858
+1031,814
+1031,260
+637,376
+1130,667
+105,255
+1097,735
+1305,828
+619,625
+1126,367
+1087,30
+13,121
+47,726
+416,679
+338,31
+647,630
+313,343
+729,320
+82,571
+1139,574
+465,491
+1017,207
+234,847
+137,478
+875,527
+956,26
+591,660
+514,581
+326,189
+1303,152
+483,857
+869,831
+483,37
+739,863
+383,600
+502,723
+919,96
+169,437
+33,157
+7,712
+1250,665
+1098,644
+792,280
+236,413
+813,437
+107,863
+1001,474
+1001,626
+1092,194
+666,638
+202,95
+223,210
+907,596
+380,600
+1087,847
+475,301
+114,196
+977,206
+666,82
+119,266
+716,823
+689,437
+303,9
+10,658
+371,637
+773,241
+1000,586
+935,56
+1202,220
+699,628
+518,280
+1076,210
+273,838
+259,880
+972,66
+798,450
+236,581
+763,600
+816,227
+1250,229
+2,250
+1120,126
+1002,789
+731,772
+222,56
+1057,345
+268,726
+802,425
+335,182
+364,252
+949,885
+464,780
+344,630
+1130,443
+1049,162
+206,820
+1168,858
+982,298
+10,275
+363,786
+1161,605
+42,298
+1158,492
+782,742
+171,709
+350,682
+1240,159
+985,504
+734,418
+364,866
+341,485
+1203,751
+902,732
+80,213
+338,150
+55,847
+726,235
+536,775
+647,661
+621,588
+445,666
+1235,74
+954,824
+610,791
+1000,406
+949,562
+82,91
+1133,45
+436,42
+1285,638
+631,291
+416,663
+1017,114
+874,194
+736,233
+441,831
+902,452
+480,434
+949,780
+272,500
+666,12
+1099,479
+57,311
+130,866
+631,43
+925,499
+868,278
+42,148
+1266,551
+657,630
+300,226
+118,327
+1089,647
+47,504
+1184,742
+966,140
+556,700
+1088,392
+239,548
+146,376
+895,151
+549,697
+897,631
+644,414
+657,182
+641,638
+146,667
+652,644
+811,709
+88,152
+1300,598
+336,411
+1054,716
+105,827
+1309,630
+304,21
+1287,851
+736,540
+883,182
+734,194
+201,462
+1228,120
+783,381
+1230,213
+574,233
+1017,885
+528,742
+905,304
+774,551
+343,621
+836,219
+420,703
+748,859
+500,18
+647,600
+415,548
+300,26
+1196,747
+152,402
+734,866
+965,514
+364,194
+154,787
+7,518
+25,638
+802,441
+972,828
+171,320
+383,495
+457,687
+355,812
+17,868
+212,868
+1181,885
+190,56
+793,739
+263,182
+181,738
+1303,712
+505,513
+565,406
+1205,67
+508,425
+982,637
+75,74
+795,190
+1236,152
+1164,376
+915,78
+293,687
+36,630
+80,354
+1019,597
+537,534
+1202,642
+310,308
+92,526
+437,644
+836,194
+155,409
+413,631
+1193,86
+7,264
+1017,306
+1120,768
+1011,304
+966,586
+728,537
+527,65
+1193,205
+1173,2
+1146,295
+63,682
+1287,535
+1253,311
+551,47
+652,698
+443,479
+63,548
+584,683
+256,211
+798,892
+1268,298
+691,114
+1220,201
+1091,724
+1201,868
+246,666
+1148,800
+78,642
+1043,775
+1161,180
+1091,518
+1027,628
+649,128
+1069,183
+164,157
+417,488
+679,87
+223,864
+1300,236
+1130,70
+492,325
+267,152
+935,814
+766,182
+80,890
+219,70
+436,338
+949,452
+939,705
+664,859
+180,21
+517,43
+947,513
+1146,463
+764,252
+811,427
+1133,849
+303,134
+736,354
+82,452
+1007,759
+164,352
+1017,9
+611,628
+1238,17
+44,103
+892,581
+1143,646
+152,624
+846,838
+1139,320
+890,236
+351,424
+845,674
+1310,11
+551,399
+1228,263
+326,717
+1308,698
+1072,439
+679,291
+754,700
+331,198
+731,820
+982,596
+80,233
+1136,684
+1277,306
+13,704
+1280,582
+103,460
+647,101
+1124,425
+319,824
+733,375
+654,33
+1283,306
+783,65
+201,432
+574,4
+1038,394
+1310,861
+938,364
+95,656
+997,551
+200,376
+313,78
+564,201
+902,325
+164,381
+1201,646
+678,10
+231,813
+361,9
+977,514
+117,86
+646,859
+427,182
+984,637
+52,70
+560,142
+1101,666
+574,764
+1143,696
+246,228
+823,646
+127,269
+164,463
+773,808
+408,442
+1230,354
+151,444
+1148,438
+146,443
+239,738
+256,716
+656,861
+290,264
+303,457
+249,823
+353,518
+540,196
+338,66
+1288,234
+482,413
+331,696
+759,460
+197,191
+114,147
+780,410
+811,633
+1007,155
+313,485
+1120,56
+1087,658
+129,137
+345,268
+846,278
+300,698
+508,3
+847,28
+822,667
+487,646
+244,442
+574,540
+689,530
+211,616
+78,252
+159,646
+894,663
+1098,868
+730,551
+436,700
+1031,437
+946,488
+11,780
+366,858
+452,351
+73,9
+1192,103
+1021,798
+508,586
+1235,148
+1232,642
+5,437
+547,143
+663,569
+1299,114
+10,816
+1300,812
+684,824
+745,406
+503,674
+1247,96
+744,742
+115,838
+621,207
+1183,65
+1299,668
+474,667
+1292,519
+361,754
+545,248
+974,859
+579,820
+117,205
+512,892
+509,518
+808,12
+8,859
+1274,264
+145,152
+836,70
+836,451
+761,639
+1104,820
+610,103
+811,37
+82,442
+793,851
+241,183
+180,451
+1062,700
+212,278
+592,852
+1087,864
+418,357
+743,828
+527,829
+199,597
+483,602
+490,705
+743,598
+80,793
+517,739
+611,593
+1156,787
+765,644
+864,432
+1146,431
+763,415
+581,885
+654,11
+1148,879
+1044,677
+499,467
+746,299
+180,443
+1133,101
+33,400
+381,196
+774,775
+847,476
+162,456
+145,44
+171,516
+442,250
+995,114
+1058,600
+957,70
+43,266
+792,320
+1297,773
+721,452
+246,676
+649,318
+180,667
+582,357
+892,357
+160,219
+304,660
+746,270
+408,121
+719,630
+579,263
+60,677
+720,329
+431,47
+344,219
+231,880
+299,530
+579,122
+293,158
+1287,43
+564,59
+845,491
+820,766
+433,247
+1059,744
+644,236
+949,392
+335,712
+802,675
+734,252
+442,565
+770,565
+171,602
+1048,362
+502,775
+1303,264
+1051,365
+1293,26
+853,879
+333,688
+644,816
+136,574
+719,234
+392,362
+774,119
+1087,684
+699,266
+736,764
+1133,381
+371,257
+793,43
+1191,266
+341,346
+607,373
+147,145
+905,590
+102,849
+505,381
+1113,703
+748,816
+782,152
+197,183
+431,684
+139,29
+746,624
+1247,630
+1300,12
+1155,19
+631,359
+72,877
+1083,467
+382,170
+298,824
+730,600
+946,194
+162,15
+512,450
+1011,28
+423,141
+488,667
+1236,775
+793,70
+2,644
+919,122
+856,518
+728,257
+723,325
+833,773
+211,415
+
+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
\ No newline at end of file