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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.
Did anyone else have to spend time actually optimizing the program due to timeouts?
The test itself seemed simple, but getting to run within the time limit turned out to be surprisingly tricky (in C#, at least).