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In this tutorial, the focus is on rotating an n by n square matrix (representing an image) 90 degrees clockwise, while ensuring that the operation is done in place, meaning no additional memory can be allocated for storage. The process involves repositioning elements of the matrix; for instance, moving the first row into the rightmost column. During this, care must be taken to temporarily save elements to avoid overwriting. Specifically, as each element is moved, the original position must be preserved until it can be replaced correctly, highlighting the challenge of performing the rotation without using extra space.
