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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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I just started c# (and coding) recently and am trying to work on 8 kyu stuff. Glad I wasn't crazy here and thanks for the reply!
I believe you are actually correct. This should have failed some test cases similar to the one you posted. To be fair to myself, I wrote this close to 5 years ago or so. Because of this, I just took another stab at it and this is how I would approach this today. No need to loop:
https://www.codewars.com/kata/reviews/57f615994f267f2f4d0000ea/groups/63923fa39321de00015a762c
int[] numbers = {3,4,3,3,3};
What if the second index holds the stray? Wouldn't this solution assume that if [0] & [1] are different, that [0] is the stray? With the above array for example. The first if statement compares index 0 and 1, they are different, so it assigns val to index [0].