Rotate Image
Detailed guide and Python implementation for the 'Rotate Image' problem.
Problem Statement
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.
Implement a function rotate(matrix: list) -> list that rotates the matrix in-place and returns it.
- •n == matrix.length == matrix[i].length
- •1 <= n <= 20
- •-1000 <= matrix[i][j] <= 1000
Examples
[[1,2,3],[4,5,6],[7,8,9]]
[[7,4,1],[8,5,2],[9,6,3]]
The matrix is rotated 90 degrees clockwise. The first column [1,4,7] becomes the first row [7,4,1] reversed.
[[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]]
Each layer of the 4x4 matrix is rotated 90 degrees clockwise.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
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