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.
Find common elements in matrix rows
Sum of diagonal of a square matrix
Return the first and last character of a string
Sums of Distinct Powers
Highest powers in factorials
Make one vector from two others
The Hills Are Alive...
"Find out the best cricket"
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