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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Fastest - avg 0.5μs
Random test cases are generating negative numbers in Golang version (as said below), but even more: test fails both if you convert negative numbers to positive (-number) and if you work with them as negative values...
Could you add a link to some page where the roman numerals are fully explained?
I had a couple of doubts... so many years since I was taught this at school... x_x
Beauteous
are you using print instead of return?