This really violates the spirit of the problem.
I know... :-p
it was quick and dirty. I will come again to solve it right. ;-)
Make a random, non-repeating vector.
Rotate input square matrix 90 degrees CCW without rot90
subtract central cross
Sum the numbers on the main diagonal
Create an index-powered vector
Text Processing - New
Graph Algorithms 3: Number of Connected Components
Magnet and Iron
Signal Processing Basic - 1. Stretch a signal
Path of least resistance - Move all direction
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