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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.
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indeed.
but when I try it again in C, it seems like it's 6th Kyu.
LOL.
This kata has been completed many times and its design will not be changed since it would invalidate all submitted solutions.
But it's probably because you are assuming
arrayis an array. Try a type check on that.We cannot know either because you don't provide any information. Please read this: https://docs.codewars.com/training/troubleshooting/
Please use a spoiler flag, comments are visible to everyone by default (I put the flag for you just now).