day 13a complete

2021-12-14 21:20:27 +00:00 · 2021-12-14 21:20:27 +00:00 · 7a47ce953c
commit 7a47ce953c
parent 5031559529
2 changed files with 1018 additions and 18 deletions
--- a/13a/main.go
+++ b/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)
 			}

-func returnContent(path string) *[][]int {
+			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 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
--- a/day13/input
+++ b/day13/input
@ -1,10 +1,941 @@
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+
+fold along x=655
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+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