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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.
Pretty nice solution, cool!
This is a beautiful and clever solution, Great!
In addition, I think is better than the most popular solution (It's on the top)
because this solution takes O(n) and doesn't use a sort method (it would take O(n*lg(n)) like the most popular solution above).