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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.
Great!!!
I am retromongol, please use printf like in C
Is the best possible solution, a linear time one. This is a classic, well known problem, for a in depth discussion see Richard Bird, THinking functionally in Haskell.