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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.
Not a kata issue. Test cases ARE large, and O(n) solution won't work. You need to look for more general solution without loops.
Fixed (issue with solution setup). Click Reset if you don't see the changes.