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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.
It is the same in most languages. For some reason we are passed strings. You need to find a way to handle it.
In C++ (visual studio 2022) long long int is 64 bits too, so bigger factorials will not fit. Is this part of the challenge?