Rotate Image

Medium

ArrayMathMatrix

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. **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]] ```

Expected Time Complexity

O(n²)

Expected Space Complexity

O(1)

Example Test Cases

Example 1

Input:

[[1,2,3],[4,5,6],[7,8,9]]

Output:

[[7,4,1],[8,5,2],[9,6,3]]

Example 2

Input:

[[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]]

Problem List

Progress0 / 0

No problems found.