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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.
I really disliked the lack of test cases. TDD is all well and good, but I need to at least have an idea of the input format. Were you going to send me integers mixed in with the string? Would it have spaces?
I believe that when you arrive at the first 100 you'd have 3 50's and no 25's, and thus be unable to provide change for a 100 (no bill combination summing to 75)