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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.
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Oh my God I've get it. The matter much easier.
There are more tests in Attempt part, your code is too slow for big values of n.
When I press "TEST" button - it works well, no fails and pretty fast.
But then I press "ATTEMPT" button - it timed out! Why?