Problem Statement
Rotate n×n matrix by 90 degrees clockwise.
Approach
Transpose the matrix, then reverse each row.
Time & Space Complexity
Time O(n²), Space O(1).

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Rotate matrix 90 degrees clockwise in-place.
Rotate n×n matrix by 90 degrees clockwise.
Transpose the matrix, then reverse each row.
Time O(n²), Space O(1).
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