LeetCode 48. Rotate Image 时间复杂度（O(n))

import copy
class Solution:
    def rotate(self, matrix: [[int]]) -> None:
        cmatrix = copy.deepcopy(matrix)
        mlen = len(matrix)
        for i in range(mlen // 2):
            curr_len = mlen - i * 2
            for j in range(curr_len - 1):
                ii, jj = i, i + j
                iii, jjj = i + j,i + curr_len - 1
                matrix[iii][jjj] = cmatrix[ii][jj]
                ii, jj = iii, jjj
                iii, jjj = i + curr_len - 1,i + curr_len - 1 - j
                matrix[iii][jjj] = cmatrix[ii][jj]
                ii, jj = iii, jjj
                iii, jjj = i + curr_len - 1 - j, i
                matrix[iii][jjj] = cmatrix[ii][jj]
                ii, jj = iii, jjj
                iii, jjj = i, i + j
                matrix[iii][jjj] = cmatrix[ii][jj]