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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'm coding in the golang version and i'm sure there's something wrong with one of the tests
given that the lower bound is 100000 and the upper bound is 12345678900000000, but somehow the answer is only 718650, which from what I calculated is way less then just the total for a 16 upside-down number sum. So, now im also wondering if actual tests are correct or not.