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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.
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Not shown to be a kata issue. Closing.
I can't view it because I solved it in JS. Seems your problem is specific and has to do with intricacies of C/C++ and how tests work, so you'll have to wait for someone else to look into it.
You should provide some examples with proper markdown, because it's hard to infer what you mean exactly.