matrix rotation by 90 degrees
Given an image represented by NxN matrix, where each pixel is 4 bytes, rotate the image by 90 degrees.
-------------------algorithm-------------------
1. transpose the matrix
rows to columns or vice versa
0 1 3 0 2 5
2 -4 9 to 1 -4 9
5 9 2 3 9 2
2. reverse each row
5 2 0
9 -4 1
2 9 3
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