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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.
Currently it's enough with reading carefully the description.
The current description is fine with this.
The current description is fine
Done
Not a kata suggestion.
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I think this can be an instructive experience. It has been for me.
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So you probably need to find another way to solve this. You are on the right track.
with value type "unsigned long long" in c++, when the number is more than 67, c++ doesn't support because the factorial of this number show like infinity.