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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 probably too slow.
There are two stages of testing:
TEST
will run your code against the sample tests,ATTEMPT
will run your code against additional tests, including random tests. So, your code may pass the first set of tests, but if it times out, it is not efficient enought to pass the second set.