I think that with this kind of problem, you can process in two steps.
A first easy problem with small N (to test perms for example). And a harder problem with big N, which
oblige to find another algorithm.
Check if sorted
intersection of matrices
Next Higher Power of B
Generate a random matrix A of (1,-1)
Three...is a magic number.
Rewrite setdiff to account for non-unique values
High Precision Square Root (Inspired by Project Euler 80)
Pandigital Factors (Based on Euler 491)
The Hills Are Alive...
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