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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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How is it possible to keep the function as long int if one of the test cases uses the value 15,241,383,936, which goes over the capacity of a long int? I had to change mine to long long int