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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.
I've had this happen on the server sometimes. I try to test it with something super simple like a console.log() or 1+2. If it still happens I just go take a break. It fixes itself on their end.
Considering the amount of solutions that have gone through, I'm around 75% sure that it isn't an issue with the kata.
...but just to be sure, is your hardware up to date? I heard a comment saying that the optimization test might still time out on some really old machines.
Otherwise, it's probably that your code isn't efficient enough. Look at zwei2's comment and my response for some hints to get a faster algorithm going.
Same problem here