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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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Let's say this kata is reranked to 7 kyu, then I could complain about there are harder 7 kyu katas than this one, so? The problem is you're expecting all 8 kyu katas to teach you fundamentals and this is a puzzle kata. You either like it or not, to each, their own.
And rightfully a 61% satisfaction rate
Ranks can't be changed anymore, so... here we are, with an 8 kyu rank and a red warning.
8kyu about addition and multiplication are essentially formuals as well, let alone 8kyu Katas with regex, so that's not an excuse. But you get the point, you can think of a solution as simple as possible to most Katas of any rank, so it should be the amount of effort that determines the rank. This one since it claims it's more difficult than other 8kyu katas then by definition it should be 7kyu. The 8kyu is deceiving for starters
But there are many examples of Katas where the solution is trivial as well but due to the mind effort you have to put the rank is higher than 8kyu. Such as https://www.codewars.com/kata/55fd2d567d94ac3bc9000064
And furthermore, this one doesn't represent a real world problem. The list is specifically designed to require a solution like this, as well as the rules. The point is such thinking is not a skill you have to improve, it's for amusement.
I'm not trying to be a snob or anything, but yea, this Kata was very funny and stuff but it's... kind of opposite of what codewars is about, to practice programming and to improve your way of thinking and problem solving skills. This teaches you nothing. Also, 8kyu Katas' purpose is to be an introduction, which this one also fails to fulfill.
You learn to think before you code. Seems reasonable to me.
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Tbh, you don't really do that.
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@beniolenio, do not post solutions for others to see
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how could we have quickly turn the 'list' into and actual list or dictionary?