题解 | #顺时针旋转矩阵#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param mat int整型二维数组 
# @param n int整型 
# @return int整型二维数组
#
class Solution:
    def rotateMatrix(self , mat: List[List[int]], n: int) -> List[List[int]]:
        # write code here
        '''
        res = [[ 0 for _ in range(n)] for _ in range(n)]
        for i in range(n):
            for j in  range(n):
                res[i][j] = mat[n-j-1][i]
        return res
        '''
        for i in range(n):
            for j in range(i):
                mat[i][j], mat[j][i] = mat[j][i], mat[i][j]  # 矩阵转置
        for i in range(n):
            for j in range(n//2):
                mat[i][j], mat[i][n-j-1] = mat[i][n-j-1], mat[i][j] #每一行做中心翻转
        return mat