2020-day20: OOF, monster (hah) backtracking algo, and then some...

algos/mirror-grid.go

@@ -0,0 +1,12 @@
+package algos
+
+// MirrorStringGrid returns the grid mirrored over the y-axis (i.e. left to right)
+func MirrorStringGrid(grid [][]string) (flipped [][]string) {
+	for i := range grid {
+		flipped = append(flipped, []string{})
+		for j := len(grid[i]) - 1; j >= 0; j-- {
+			flipped[i] = append(flipped[i], grid[i][j])
+		}
+	}
+	return flipped
+}