You are given an n × 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.
n == matrix.length == matrix[i].length1 <= n <= 20-1000 <= matrix[i][j] <= 1000matrix = [[1,2,3],[4,5,6],[7,8,9]][[7,4,1],[8,5,2],[9,6,3]]matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]][[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]