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!
Counting in Finnish
Count from 0 to N^M in base N.
Is the Point in a Circle?
Create incrementing array
Outer product of multiple vectors
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - sort monomials
Fangs of a vampire number
Find vampire numbers
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