Day 8 part 1

day-8/main.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+type coord struct {
+	x int
+	y int
+}
+
+func check(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func generateMap(lines [][]byte) map[byte][]coord {
+	output := make(map[byte][]coord)
+	for y, line := range lines {
+		for x, char := range line {
+			if char == 46 {
+				continue
+			}
+			new_coord := coord{x: x, y: y}
+			output[char] = append(output[char], new_coord)
+		}
+	}
+	return output
+}
+
+func parseInput() [][]byte {
+	raw_data, err := os.ReadFile("input.txt")
+	check(err)
+	data := string(raw_data[:])
+	lines := strings.Split(data, "\n")
+	output := make([][]byte, len(lines)-1)
+	for n, line := range lines {
+		if len(line) > 0 {
+			output[n] = []byte(line)
+		}
+	}
+	return output
+}
+
+func part1(input [][]byte, charmap map[byte][]coord) {
+	counter := 0
+	for _, coords := range charmap {
+		for n1, coord1 := range coords {
+			for n2, coord2 := range coords {
+				if n1 == n2 {
+					continue
+				}
+				newY := coord1.y + (coord1.y - coord2.y)
+				newX := coord1.x + (coord1.x - coord2.x)
+
+				if newY < 0 || newY >= len(input) {
+					continue
+				}
+				if newX < 0 || newX >= len(input[0]) {
+					continue
+				}
+
+				if input[newY][newX] != '#' {
+					input[newY][newX] = '#'
+					counter += 1
+				}
+			}
+		}
+	}
+
+	// for _, line := range input {
+	// 	for _, char := range line {
+	// 		fmt.Print(string(char), " ")
+	// 	}
+	// 	fmt.Println()
+	// }
+
+	fmt.Println(counter)
+}
+
+func main() {
+	input := parseInput()
+	things := generateMap(input)
+	fmt.Println("Part 1:")
+	part1(input, things)
+}