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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 just tried a few solutions and all worked fine. No possible overflow in the random tests! The numbers in the basic tests are far bigger. Could you give an example of your suspicion?
I think you should look at your code: maybe some error somewhere?