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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.
That is not at all what this kata is about. This kata is to find the index where the sum of both sides are equal. We do not care which sides sum is the greatest. I also do not know what you mean by your last sentence, but I think that you are confused about the point of this kata.
No, it wasn't, but I added a testcase for you ^^. Thanks for your feedback!