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Grokking the Coding Interview Patterns

Solution: Rotate Image

Explore how to rotate an n by n matrix 90 degrees clockwise directly within the original matrix without extra space. Understand the step-by-step swaps involved in groups of four cells and learn an efficient algorithm with O(n²) time and O(1) space complexity, helping you solve typical matrix rotation problems in coding interviews.

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Statement

Given an n×nn \times n matrix, rotate the matrix 90 degrees clockwise. The performed rotation should be in place, i.e., the given matrix is modified directly without allocating another matrix.

Note: The function should only return the modified input matrix.

Constraints:

  • matrix.length == matrix[i].length
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