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Rotate Image
Difficulty: Medium
Category: DSA
Topics: Array, Math, Matrix
Asked at: Amazon, Microsoft, Apple, Uber, Cisco, Facebook, Rubrik, Adobe, Nvidia, Google, Quora, eBay, PayTM
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`
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