[leetcode]Rotate Image @ Python

时间:2022-12-03 15:38:47

原题地址:https://oj.leetcode.com/problems/rotate-image/

题意:

You are given an n x n 2D matrix representing an image.

Rotate the image by 90 degrees (clockwise).

Follow up:
Could you do this in-place?

解题思路:先将矩阵转置,然后将矩阵的每一行翻转,就可以得到所要求的矩阵了。

代码:

class Solution:
# @param matrix, a list of lists of integers
# @return a list of lists of integers
def rotate(self, matrix):
n = len(matrix)
for i in range(n):
for j in range(i+1, n):
matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]
for i in range(n):
matrix[i].reverse()
return matrix