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!
Remove the air bubbles
Sum the Digits of a Number
Vectors counting by 2
Fangs of a vampire number
Multivariate polynomials - overload multiplication
Multivariate polynomials - convert monomial form to array
Find all vampire fangs
Outer product of multiple vectors
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