Write a function that has the following property: f(f(x)) = -x for any numeric array x.
Note that there is no restriction on the output for f(x). How bizarre can you make it?
This one really surprised me.
Getting a little silly!
Add two numbers
Prime factor digits
Sorted highest to lowest?
Multivariate polynomials - sort monomials
Find vampire numbers
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - convert monomial form to array
Outer product of multiple vectors
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