48. Rotate Image

You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise).

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:

1 2	Input: matrix = [[1,2,3],[4,5,6],[7,8,9]] Output: [[7,4,1],[8,5,2],[9,6,3]]

Example 2:

1 2	Input: matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]] Output: [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]

Example 3:

1 2	Input: matrix = [[1]] Output: [[1]]

Example 4:

1 2	Input: matrix = [[1,2],[3,4]] Output: [[3,1],[4,2]]

旋轉陣列，每列反轉再zip。

Time: O(n), Space: O(1)
class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        matrix[:] = zip(*matrix[::-1])# 789,456,123 =>zip by slice

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