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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.
It seems to be roughly at the same difficulty level as 'Snail', a similar kata which is at 4 kyu.
Binary search won't work if the array isn't sorted, iirc
Given that the input size is negligible and stable at only 3, that shouldn't be a problem, surely