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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.
C : If anybody else is storing number as string in an array and working with it, use uint64__t inplace of ull if can't pass tests with long-ass number as edge case. Strangely, ull doesn't work for more than 10 digits. Maybe, it's the ull implementation or compiler issue(implementation of compiler).