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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.
specifically for the reason you just gave: sum of nothing == 0 ;)
988 isn't a square number.
The "baa" example can be mapped to 988 to get the highest number.
But when there is two negative elements close to each other, it is considered as no such sum, why should I return 0??? (last example)