spiral

问题 A friend was in need of an algorithm that would let him loop through the elements of an NxM matrix (N and M are odd). I came up with a solution, but I wanted to see if my fellow SO\'ers could come up with a better solution. I\'m posting my solution as an answer to this question. Example Output: For a 3x3 matrix, the output should be: (0, 0) (1, 0) (1, 1) (0, 1) (-1, 1) (-1, 0) (-1, -1) (0, -1) (1, -1) Furthermore, the algorithm should support non-square matrices, so for example for a 5x3