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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.
I disagree. If int overflows, it wraps and goes to negative. Returning a negative number is clearly not mathematically correct, therefore zero should be returned.
Why are all the accepted and upvoted solutions ignoring the requirement that out of range values (ie. any sum greater than Integer.MAX_VALUE) should be zero?