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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.
'looks like u solved it'
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Random tests input values go in Python from 40000 to 100000. Try another way.
My python code works for test cases and can do up to perimeter(10000) in about 5 seconds. It's pretty efficient I think, but maybe not good enough? It times out.