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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.
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this days i have completed 400 problem in CF
you are right
i was noob in problem solving and i was not have right understanding to recursion
Don't ponder on this too much if you want to keep your sanity. C++ version of the kata alone has many more "interesting" features, and kata's overall shape ressembles the biggest big ball of mud I happened to work with ;)