leetcode刷题-48旋转图像

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n  = len(matrix)
        def reverse(matrix: List[List[int]]):
            for i in range(n):
                for j in range(i, n):
                    matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]
        
        def exchange(matrix: List[List[int]]):
            for i in range(n):
                for j in range(int(n/2)):
                    matrix[i][j], matrix[i][n - j - 1] = matrix[i][n - j - 1], matrix[i][j]
        
        reverse(matrix)
        exchange(matrix)