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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.
in java you have to fucking change type of method from int to long to make it show the last test's result right, omg ive killed like 2 hours solving it