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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.
And that's been answered many times before, why didn't you read those responses instead of creating a non existant issue? It's not a problem of speed, it's what I told you, a problem with your code not checking correctly the input values and creating an infinite loop. Read this: https://docs.codewars.com/training/troubleshooting#timeout
And about telling you where your problem is being unhelpful... ¯\_(ツ)_/¯
You didn't provide your code nor which language you were using, that's unhelpful.
It's tiresome to answer the same over and over and more when people see it was asked and answered before.
And like others, it's a problem with your code not checking the input values and having an infinite loop. Not a kata issue.