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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.
Thanks, glad you learned something here
This solution is so nice. Learned a lot from it.
The problem is in the kata description, AFAIK, all languages except OCaml expect empty string if there are no repeated letters. It should be marked as an issue.
Thanks it's easy to adapt this algorithm to scan only a third of all numbers instead of an half.
except 2... ;)