use x := range and y := range, easier to read.

day-12/internal/one/solve.go

@@ -15,9 +15,9 @@ func Solve(buf []byte) (int, error) {
 
 	var totalCost int
 	totalAreaVisited := make(map[point]struct{})
-	for i := 0; i < len(graph.data); i++ {
-		for j := 0; j < len(graph.data[i]); j++ {
-			start := newPoint(j, i)
+	for y := range graph.data {
+		for x := range graph.data[y] {
+			start := newPoint(x, y)
 			if graph.isOutOfBounds(start) {
 				continue
 			}