Day3

day3/day3.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"AoC2020/helper"
+	"fmt"
+	"os"
+)
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetInput(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println(day3(input, 3, 1))
+	fmt.Println(day3Part2(input, [][]int{{1, 1}, {3, 1}, {5, 1}, {7, 1}, {1, 2}}))
+
+}
+
+func day3Part2(input []string, slopes [][]int) int {
+	result := 1
+	for _, slope := range slopes {
+		result = result * day3(input, slope[0], slope[1])
+	}
+	return result
+}
+
+func day3(input []string, right int, down int) int {
+	count := 0
+	x := 0
+	y := 0
+	for y < len(input) {
+		if string(input[y][x]) == "#" {
+			count++
+		}
+		x = (x + right) % (len(input[0]))
+		y = y + down
+	}
+	return count
+}

day3/day3Input.txt

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day3/day3Test.txt

@@ -0,0 +1,11 @@
+..##.......
+#...#...#..
+.#....#..#.
+..#.#...#.#
+.#...##..#.
+..#.##.....
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