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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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@dinglemouse sick bastard
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Maybe you prefer rats...
No, it was not disabled. It's not available in Node 10.
Agree, it's way too easy for 6kyu
Difficulty is often individual.
That's only because you went with very inefficient, O(n) solution. You are right that with tests which allow such approach, problem is (IMO) not worth its 6 kyu rank.
But you can take the game one step up and look for fast, efficient, O(1) solution, which will work for large numbers numbers (like 1_000_000_000) in a reasonable time (like, immediately).
But yeah, my dream is to downgrade this problem to white, or make it fail on O(n) solutions, one day ;)