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!
Determine whether a vector is monotonically increasing
Alphabetize by last name
Back to basics 10 - Max Float
How many trades represent all the profit?
Multivariate polynomials - overload multiplication
Fangs of a vampire number
Multivariate polynomials - emulate symbolic form
Find all vampire fangs
Find vampire numbers
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