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).
Specific Element Count
Return unique values without sorting
Flip the main diagonal of a matrix
Find out missing number from a vector of 9 elements
Golomb's self-describing sequence (based on Euler 341)
Generalised Hamming Number
Negation and new variables
Pandigital number n°1 (Inspired by Project Euler 32)
Expression or variable?
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