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 5 - Clipboard
Getting the indices from a vector
Fibonacci-Sum of Squares
Product of elements in row
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - overload multiplication
Find vampire numbers
Find all vampire fangs
Product of two multivariate polynomials
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