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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.
Yes, the expected results are ok and you're returning them wrong, analyze why. You're not using all bills to give change it seems.
Print the input, the tests are ok. When the problem is in your code, use
Questionlabel instead.