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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 test cases can be tricked easily, at times its giving us negative numbers and other times positive number and depending on the coders luck her can clear the kata easily.