Combine AoC Repos

2015/day06/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var input []string
+	var readInp string
+	for {
+		_, err := fmt.Scan(&readInp)
+		if err != nil {
+			if err != io.EOF {
+				log.Fatal(err)
+			}
+			break
+		}
+		input = append(input, readInp)
+	}
+
+	var lights [][]int
+	for i := 0; i < 1000; i++ {
+		lights = append(lights, make([]int, 1000))
+	}
+	for i := range input {
+		if input[i] == "on" || input[i] == "off" || input[i] == "toggle" {
+			stX, stY := parseLocations(input[i+1])
+			endX, endY := parseLocations(input[i+3])
+			for ix := stX; ix <= endX; ix++ {
+				for iy := stY; iy <= endY; iy++ {
+					if input[i] == "on" {
+						lights[ix][iy]++
+					} else if input[i] == "off" {
+						if lights[ix][iy] > 0 {
+							lights[ix][iy]--
+						}
+					} else if input[i] == "toggle" {
+						lights[ix][iy] += 2
+					}
+				}
+			}
+		}
+	}
+	var brightness int
+	for i := 0; i < 1000; i++ {
+		for j := 0; j < 1000; j++ {
+			brightness += lights[i][j]
+		}
+	}
+	fmt.Printf("Brightness: %d\n", brightness)
+}
+
+func parseLocations(s string) (int, int) {
+	dirSplit := strings.Split(s, ",")
+	return assertAtoi(dirSplit[0]), assertAtoi(dirSplit[1])
+}
+
+func assertAtoi(s string) int {
+	ret, err := strconv.Atoi(s)
+	if err != nil {
+		fmt.Println("Error in Atoi: " + s)
+		os.Exit(1)
+	}
+	return ret
+}