LeetCode 刷题记录: 48. Rotate Image [Python]

原题

https://leetcode.com/problems/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.

思路

先转置再x轴颠倒。

代码

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        for i in range(len(matrix)):
            for j in range(i):
                matrix[i][j],matrix[j][i]=matrix[j][i],matrix[i][j]
        for i in range(len(matrix)):
            matrix[i][:]=matrix[i][::-1]

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LeetCode 刷题记录: 48. Rotate Image [Python]

原题

思路

代码

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