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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.
Except it's badly-written and reinventing the wheel. Currently it's considerably slower than a naive
O(n * log(n))solution.Fork with an actually efficient
O(n)code.Range is not defined by description, so for TDD if not tested then its not a requirement IMO