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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 solution is nlogn I believe, which is slower than just a single pass.
poorly worded. Please explain regarding sample inputs and outputs. Not just random inputs!
What?