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).
Swap the first and last columns
Given a 4x4 matrix, swap the two middle columns
Rounding off numbers to n decimals
Longest Collatz Sequence
Find my secret number
I want to know everything!
Find the path through the cell
Numbers spiral diagonals (Part 2)
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