Inspired by problem 1840.
Given an arbitrary n by n matrix, rotate it 45 degrees counterclockwise as in the following example:
if x is
rot45(x) would then be
0 3 0
1 0 4
0 2 0
So the matrix gets larger each time it is rotated.
Find matching parenthesis
Is this matrix orthogonal?
Rotate and display numbered tile
Sum the elements in either diagonal of a square matrix
Probability of winning single-elimination tournament
Possible Opponents Matrix for single-elimination tournament
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