I think that with this kind of problem, you can process in two steps.
A first easy problem with small N (to test perms for example). And a harder problem with big N, which
oblige to find another algorithm.
Longest Divisor Run
How to find the position of an element in a vector without using the find function
Better bullseye matrix
create a circulant matrix
Is this triangle right-angled?
What digit is it?
Rolling maximums above a threshold
It's going down. We're finding simbers!
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