Rotate Image

main.py

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n = len(matrix)
        for i in range(n//2):
            l, r = i, n - i - 1
            x = 0
            for j in range(l, r):
                matrix[l][j], matrix[j][r], matrix[r][r - x], matrix[r - x][l] = (
                    matrix[r - x][l], matrix[l][j], matrix[j][r], matrix[r][r - x])
                x += 1