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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.
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Seems like an O(n) solution. Well done!
don't comment the obvious
cool
Everything above (and including) 4000 does give an OutOfBoundsException with this solution.