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.
Which doors are open?
Find state names that end with the letter A
Removing rows from a matrix is easy - but what about inserting rows?
Some Assembly Required
Points on a Sphere
Pandigital Factors (Based on Euler 491)
Lowest sum from a group of digits
How Far Can You Throw Something?
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