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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.
This program is efficient. But remember that in most 'max subarray sum' problems they don't ask you for the sum, instead they'll ask you to return the subarray.