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!
First non-zero element in each column
2 b | ~ 2 b
Is A the inverse of B?
Given a 4x4 matrix, swap the two middle columns
multiply by three
Product of two multivariate polynomials
Multivariate polynomials - convert monomial form to array
Find all vampire fangs
Fangs of a vampire number
Find vampire numbers
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