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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.
913 Users did this kata in C++ without problems...
Don't post an issue, it's not a problem of the kata, 120 guys passet it in C++. You could have a problem with your code. Try to print the input to see where that happens.