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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.
Help us help you. At the very least, mention what language you're having this problem with.
Also, probably a solution issue, not a kata one. But without the failing solution, we have no way to tell.
Closing.
@soyaungmin If you get a 12sec timeout chances are you have an infinite loop in the solution. Copy the sample test to your local machine and debug the solution.
Maybe your solution is too slow
I answer your issue: you could have seen that 875 guys passed the Python kata so there are no errors in the tests.
Issues are for errors in a kata not for question about your code.