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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.
Didn't realize that. But in any case, I tried the kata again and the solution passed in 74ms.
So, it's definitely possible to do this kata.
I don't think that the Code Runner is not running up to speed.
Have a look at it here:
http://status.codewars.com/
No, it means that your algorithms is too slow. You need to optimize your program. Maybe think of a better way to solve the problem.