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.
give nth decimal place of pi
Add two numbers
Find all vampire fangs
Convert matrix to 3D array of triangular matrices
Probability of winning single-elimination tournament
Possible Opponents Matrix for single-elimination tournament
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