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!
Whether the input is vector?
Reverse the elements of an array
Is it an Armstrong number?
Calculate distance travelled when given radius and rotations
Product of elements in row
Multivariate polynomials - overload multiplication
Fangs of a vampire number
Product of two multivariate polynomials
Multivariate polynomials - convert monomial form to array
Outer product of multiple vectors
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