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
20383 Solvers
626 Solvers
927 Solvers
516 Solvers
Find perfect placement of non-rotating dominoes (easier)
240 Solvers
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