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!
Return a list sorted by number of occurrences
How many trades represent all the profit?
Implement simple rotation cypher
Multivariate polynomials - overload multiplication
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - sort monomials
Product of two multivariate polynomials
Outer product of multiple vectors
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