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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.
Updated :-)
That's not a correct way to iterate backwards, the direction of iteration remains the same, so it results in undefined behavior.
Also, it crashes with the current sample tests. If you're still using old tests, click Reset.
12000 is completions in all languages, 800 is completions in C++, so it's not "BROKEN". The tests could use a different overload of the functions if they were in the scope, which could give false successes but not the other way - this is fixed now.