% About 60s rows = 5; cols = 5; puzzle = [| 1, 0, 2, 3, 1 | 0, 0, 0, 3, 3 | 1, 0, 2, 0, 1 | 3, 3, 0, 0, 0 | 4, 4, 4, 0, 2 |];