Rotate Image (Leetcode 48)

Problem Link: https://leetcode.com/problems/rotate-image/

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n=len(matrix)
        
        # 1) Find the transpose of the matrix
        for i in range(n):
            for j in range(i):
                matrix[i][j],matrix[j][i]=matrix[j][i],matrix[i][j]
        
        # 2) Reverse each row
        for i in range(n):
            matrix[i]=matrix[i][::-1]
        
        return matrix