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!
Remove NaN ?
How many trades represent all the profit?
Create an 'arrow-head" matrix
What number has this problem?
Dimensions of a rectangle
Fangs of a vampire number
Multivariate polynomials - overload multiplication
Find all vampire fangs
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - convert monomial form to array
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