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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.
On my computer I was able to pass the given test case within a second, but somehow when I copy the code and attempt the testcase here I get a timeout error. The only reason I can think of is I'm using python 3.6, but here only 3.4 is available. But still, that should not make such a huge efficiency difference right?