Rotate Image — JavaScript Coding Problem
Difficulty: medium | Category: array
Problem Description
You are given an `n x n` 2D matrix representing an image. Rotate the matrix **90 degrees clockwise**, **in-place**. Do not allocate another 2D matrix — modify the input matrix directly.
Examples
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]]