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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.
I got the same... actually, how does 2017 return 2071? Shouldn't it be 7210? The test seems erroneous.
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You read the error message incorrectly. 515 is not the input number, it is your answer.
515 should equal 531
2020 should equal 2071
-1 should equal 441
-1 should equal 414
how is this? how can I get 531 from 515 as next bigger?
author are u sure tests are ok?