048.Rotate-Image_v2.py

class Solution:
    def rotate(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: void Do not return anything, modify matrix in-place instead.
        """
        N = len(matrix)
        for i in range(N//2):
            matrix[i],matrix[N-1-i] = matrix[N-1-i],matrix[i]
        for i in range(N):
            for j in range(0,i):
                matrix[i][j],matrix[j][i] = matrix[j][i],matrix[i][j]