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.
Swap the first and last columns
Given an unsigned integer x, find the largest y by rearranging the bits in x
Number of 1s in a binary string
Getting the absolute index from a matrix
sum of first 'n' terms
Numbers in extended form
Community Problem 500!
Why the heck are they blinking!?!?
Give me Hamming on five, hold the mayo
It's going down. We're finding simbers!
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