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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.
A single argument matrix, a 2D integer matrix of size n x n.
The matrix is modified in place and rotated by 90 degrees clockwise.
n == matrix.length == matrix[i].length 1 <= n <= 20 -1000 <= matrix[i][j] <= 1000
Example 1
Input
[[1,2,3],[4,5,6],[7,8,9]]
Output
[[7,4,1],[8,5,2],[9,6,3]]
Explanation
Rotating the given 3x3 matrix by 90 degrees clockwise results in the matrix shown.