Diagonal Difference

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    The problem explicitly states you start with an NxN array, so, per the rules expressed in the orientation, this would not be an acceptable answer. Not to say it doesn't give the same result, but in a real test, if they are seeing how you handle (a) the problem stated (i.e. changing the problem fundamentally = fail) and (b) how you used the constraints provided to solve the problem, this would be problematic.