You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Note:
You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.
Example 1:
Given input matrix = [ [1,2,3], [4,5,6], [7,8,9] ], rotate the input matrix in-place such that it becomes: [ [7,4,1], [8,5,2], [9,6,3] ]Example 2:
Given input matrix = [ [ 5, 1, 9,11], [ 2, 4, 8,10], [13, 3, 6, 7], [15,14,12,16] ], rotate the input matrix in-place such that it becomes: [ [15,13, 2, 5], [14, 3, 4, 1], [12, 6, 8, 9], [16, 7,10,11] ]翻转矩阵，如果用python特有的属性应该很快可以做到，但是题目要求直接输出修改后的marix，不需要返回。也就是在matrix上修改，经过观察数据可以发现，想进行上下翻转，然后进行对称翻转
class Solution(object): def rotate(self, matrix): """ :type matrix: List[List[int]] :rtype: None Do not return anything, modify matrix in-place instead. """ row=len(matrix) column=len(matrix[0]) for i in range(row/2): for j in range(column): matrix[i][j],matrix[column-1-i][j]=matrix[column-1-i][j],matrix[i][j] for i in range(row): for j in range(i,column): matrix[i][j],matrix[j][i]=matrix[j][i],matrix[i][j]
