A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Select every other element of a vector
Factorize THIS, buddy
Back to basics 10 - Max Float
Find perfect placement of non-rotating dominoes (easier)
Add more zeros
Permute diagonal and antidiagonal
BLOCK x3 (Version 1)
Numbers spiral diagonals (Part 2)
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