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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.
If this is for css, shouldn't '#111' be acceptable as well?
I think test cases lack explicit check for large negative number, for example -100. I really saw some solutions that used only -1 for empty result check.
The Haskell test suite does not enforce the correctness for n > 254 case, so I accidentally submitted an incorrect solution and it got accepted.