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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.
Next bigger.
I misred the question. It's asking for the next biggest number and not biggest number that can be formed.
It depends what is the input. What is the input which expects answer of 2071 while you expect the valid answer to be 7210?
Shouldn't 2071 be 7210? Seems like the tests are wrong.