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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.
sort is work on my env , but not right in this test .How could this happen
The big hint here is find a way to efficiently compute the total number of divisors.
time out .How to fix it