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).
Tic Tac Toe FTW
Make one big string out of two smaller strings
Convert a vector into a number
Wheat on a chessboard pt 2
Given a 4x4 matrix, swap the two middle columns
Magic is simple (for beginners)
Divisors for big integer
Chess ELO rating system
Narcissistic number ?
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