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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.
The description specifies: "Input will always be a non-negative integer."
Doesn't work correct for negative both n and m.
Don't think this solution is correct: when n and m are both negative, this solution will give you the positive result, when 0 should be returned.