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).
Back to basics 19 - character types
Find best domino orientation
"Look and say" sequence
Check that number is whole number
Numbers spiral diagonals (Part 2)
Return a list sorted by number of consecutive occurrences
BLOCK x3 (Version 1)
How many monitors are connected ?
How to reverse spdiags?
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