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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.
How many digits has 371? Read the description again.
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Your code should not show valid output, but should return a valid result. See this for some help: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#expected-the-same
What do you mean? Time limit is reached? Your code is so slow... Try to think different ( basics of dynamic programming will help you xD )