48. Rotate Image Difficulty: Medium Topics: Array , Math , Matrix You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the image in-place , which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation. Example 1: Input: matrix = [[1,2,3],[4,5,6],[7,8,9]] Output: [[7,4,1],[8,5,2],[9,6,3]] Example 2: Input: matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]] Output: [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]] Constraints: n == matrix.length == matrix[i].length 1 <= n <= 20 -1000 <= matrix[i][j] <= 1000 Solution: The solution rotates an n x n matrix 90 degrees clockwise in-place without using extra memory. It achieves this by a two-step process : first transposing the matrix (swap rows and columns), then reversing each row. This approach is a standard and efficient solution for this problem.…