
class Solution(object):
    def rotate(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: void Do not return anything, modify matrix in-place instead.
        """
        matrix[::] = zip(*matrix[::-1])

class Solution:
    def rotate(self, A):
        n = len(A)
        for i in range(n/2):
            for j in range(n-n/2):
                A[i][j], A[~j][i], A[~i][~j], A[j][~i] = \
                         A[~j][i], A[~i][~j], A[j][~i], A[i][j]

# best solution you can think of