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).
High school cafeteria
Remove the two elements next to NaN value
Implement simple rotation cypher
Sum of odd numbers in a matrix
Generalised Hamming Number
Find my secret number
Pandigital number n°3 (Inspired by Project Euler 32)
Find the path through the cell
Getting the indices from a matrice
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