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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.
Maybe. But my C++ solution still works, so I still think there's mistake in your code.
When you read the error message you see that it's a stack overflow error so probably your solution causes too deep (infinite?) recursion, or creates a very large stack variable.