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).
Most nonzero elements in row
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 3, Largest prime factor
Decrypt the cypher using XOR encryption (for beginners)
Without the French accent please!
Mysterious digits operation (easy)
BLOCK x3 (Version 1)
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