Name:Sravya
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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.
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I like this solution best, because it works when n and m are negative (although the problem statement claims the inputs will never be negative).
Not true. If n or m are 0, first if will be true, and return 0
If n or m are 0 you will return -1. Why test didn't check that?