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).
Factorize THIS, buddy
vectorization in N
Is X a Fibonacci Matrix?
Construct an index vector from two input vectors in vectorized fashion
Operate on matrices of unequal, yet similar, size
Add more zeros
Numbers spiral diagonals (Part 1)
Find Missing Number
Find indices of diagonal elements
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