1 files changed, 87 insertions, 0 deletions
diff --git a/eight.go b/eight.go
new file mode 100644
index 0000000..74be0e1
--- /dev/null
+++ b/eight.go
@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strconv"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		panic("runtime error: missing operand")
+	}
+	file, err := ioutil.ReadFile(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+	image := sliceify(file, 25, 6, len(file)/(25*6))
+
+	checksum(image)
+	decode(image)
+}
+
+func sliceify(file []byte, width int, height int, depth int) [][][]int {
+	var image [][][]int
+	pointer := 0
+
+	for i := 0; i < depth; i++ {
+		var b [][]int
+		for j := 0; j < height; j++ {
+			var a []int
+			for k := 0; k < width; k++ {
+				element, err := strconv.Atoi(string(file[pointer]))
+				if err != nil {
+					panic(err)
+				}
+				a = append(a, element)
+				pointer++
+			}
+			b = append(b, a)
+		}
+		image = append(image, b)
+	}
+	return image
+}
+
+func count(layer [][]int, val int) int {
+	total := 0
+	for i := 0; i < len(layer); i++ {
+		for j := 0; j < len(layer[i]); j++ {
+			if layer[i][j] == val {
+				total++
+			}
+		}
+	}
+	return total
+}
+
+func checksum(image [][][]int) {
+	min := count(image[0], 0)
+	layer := -1
+	for i := 0; i < len(image); i++ {
+		total := count(image[i], 0)
+		if total < min {
+			min = total
+			layer = i
+		}
+	}
+	fmt.Println(count(image[layer], 1) * count(image[layer], 2))
+}
+
+func decode(image [][][]int) {
+	for i := 0; i < len(image[0]); i++ {
+		for j := 0; j < len(image[0][0]); j++ {
+			for k := 0; k < len(image); k++ {
+				if image[k][i][j] == 0 {
+					fmt.Print(" ")
+					break
+				} else if image[k][i][j] == 1 {
+					fmt.Print("X")
+					break
+				}
+			}
+		}
+		fmt.Println()
+	}
+}