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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 has the best time and space complexity. You could easily write comments explaining what this is doing, but the code itself is optimal.
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I like this answer a lot.
I pretty much wrote the same code as this, and mine worked.