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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.
The tests for Java are working correctly. Also, your algorithm works, however it needs to be improved for efficiency to pass the kata.
The tests are ok, your code is wrong.