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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.
Your code is too slow, it uses too many cycles for bigger values of n. Next time you post code, please, read the page I linked, and use code markdown and mark your post as having spoiler content.
Read this. Without seeing your code we can only guess.
Read this info too.
You're already provided with a number passed in as a function argument.