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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 is quite WEIRDO to limit a solution by using some specific keywords in its text!
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O(n^2)
Useless.
You definetely can return a lambda function. Moreover, you can return lambda function from another lambda function.
Shortest? ;)
No-lambda one-liner ;)
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