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
given 3 sides, find area of this triangle
Determine Whether an array is empty
Set the array elements whose value is 13 to 0
Unique values without using UNIQUE function
Matrix of Multiplication Facts
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Exponents in Factorials
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