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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.
Why would anyone implement those sorting algorithms whereas there's tons of libraries out there? Ever heard of code re-use? If an interview candidate re-wrote those algorithms, I would immediately dismiss them.
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