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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.
engineer challenge is misspelled. Should be:
PS: This is a sample question of the facebook engineer challenge on interviewstreet. I found it quite fun to solve on paper using math , derive the algo that way. Have fun!