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!
Back to basics 22 - Rotate a matrix
Back to basics 23 - Triangular matrix
Generate this matrix
Find vampire numbers
Multivariate polynomials - convert monomial form to array
Find all vampire fangs
Fangs of a vampire number
Multivariate polynomials - sort monomials
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