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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.
because when "Attempting" it runs with a bigger test input and eventually you will get timeout if your alg is not optimized
Well, performance tester fcks up your slow solution, that's what happens ;)