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@@ -0,0 +1,56 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "log"
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+ "os"
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+)
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+
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+type Point struct {
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+ x, y int
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+}
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+
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+func (p *Point) key() string {
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+ return fmt.Sprintf("%d_%d", p.y, p.x)
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+}
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+
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+func readInput(file *os.File) (map[byte][]Point, [][]byte) {
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+ scanner := bufio.NewScanner(file)
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+ var matrix [][]byte
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+ groups := make(map[byte][]Point)
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+
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+ var y int
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+ for scanner.Scan() {
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+ line := scanner.Text()
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+ if line == "" {
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+ break
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+ }
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+
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+ matrix = append(matrix, []byte(line))
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+ for x := range line {
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+ if line[x] != '.' {
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+ groups[line[x]] = append(groups[line[x]], Point{x: x, y: y})
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+ }
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+ }
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+
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+ y++
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+ }
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+
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+ return groups, matrix
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+}
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+
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+func main() {
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+ if len(os.Args) < 2 {
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+ log.Fatal("You need to specify a file!")
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+ }
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+
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+ filePath := os.Args[1]
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+ file, err := os.Open(filePath)
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+ if err != nil {
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+ log.Fatalf("Failed to open %s!\n", filePath)
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+ }
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+
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+ groups, matrix := readInput(file)
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+ fmt.Println(groups, matrix)
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+}
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