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Rotate an n×n matrix 90 degrees in place.

Rotating a matrix in place tests index manipulation and the transpose-then-reverse trick. The signal is decomposing the rotation into two simple passes rather than juggling four-way swaps. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Rotating a matrix in place tests index manipulation and the transpose-then-reverse trick. The signal is decomposing the rotation into two simple passes rather than juggling four-way swaps. Here is the answer.

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