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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.
2ez
It's not clear what you call an O(n) complexity. There's a well known math algorithm to solve that, you obviously don't need to iterate all values until finding the solution. Please don't post issues like that, just because you can't solve a kata the way you would like.
Tests time out at an O(n) complexity, please adjust them to reasonable integer sizes/timeouts