Big update: Adding all advent of codes to same repo

AdventOfCode2021/day13/day13.go

@@ -0,0 +1,91 @@
+package day13
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type coord struct {
+	x int
+	y int
+} 
+
+func Run(dat []byte) (int, int) {
+
+	splitBytes := bytes.Split(dat, []byte{10, 10})
+	stringCoords := strings.Split(string(splitBytes[0]), "\n")
+	stringInstructions := strings.Split(string(splitBytes[1]), "\n")
+	
+	coordMap := make(map[coord]int)
+	
+	for _, line := range stringCoords {
+		splitLine := strings.Split(line, ",")
+		x, _ := strconv.Atoi(splitLine[0])
+		y, _ := strconv.Atoi(splitLine[1])
+		coordMap[coord{x: x, y: y}] = coordMap[coord{x: x, y: y}] + 1
+	}	
+
+	part1 := 0
+	part2 := 0
+
+	for i := 0; i < len(stringInstructions); i++ {
+		splitInstruction := strings.Split(stringInstructions[i], "fold along ")
+		number, _ := strconv.Atoi(string(splitInstruction[1][2:]))
+		if splitInstruction[1][0] == 'y' {
+
+			for k, _ := range coordMap {
+				if k.y > number {
+          delete(coordMap, k)
+					coordMap[coord{x: k.x, y: k.y - ((k.y - number) * 2)}] += 1 
+				}
+			}
+
+		} else {
+
+			for k, _ := range coordMap {
+				if k.x > number {
+          delete(coordMap, k)
+					coordMap[coord{x: k.x - ((k.x - number) * 2), y: k.y}] = 1
+				}
+			}
+
+		}
+
+		if (i == 0) {
+			for k, _ := range coordMap {
+				if coordMap[k] > 0 {
+					part1++
+				}
+			}
+		}
+
+	}
+
+	highestX := 0
+	highestY := 0
+	for k, _ := range coordMap {
+		if k.x > highestX {
+			highestX = k.x
+		}
+		if k.y > highestY {
+			highestY = k.y
+		}
+	}
+	
+
+	for i := 0; i <= highestY; i++ {
+		for j := 0; j <= highestX; j++ {
+
+			if coordMap[coord{x: j, y: i}] > 0 {
+				fmt.Print("#")
+			} else {
+				fmt.Print(".")
+			}
+		}
+		fmt.Println()
+	}
+	
+	return part1, part2
+}