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).
The Goldbach Conjecture, Part 2
Is the Point in a Triangle?
Make a simplified barcode
Rotate input square matrix 90 degrees CCW without rot90
Numbers spiral diagonals (Part 2)
Find my secret number
Pandigital number n°3 (Inspired by Project Euler 32)
Decrypt the cypher using XOR encryption (for beginners)
Chess ELO rating system
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