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-rw-r--r--eight.go87
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()
+ }
+}