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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.
When you ask for help, post a question, not an issue. You could have seen at the top of the page that 925 guys passed the C++ kata out of a total of more than 18000 which means that there is a problem with your code.