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    This is a great demonstration of how terrible is codewars ranking system.

    At least add buttons "Bad Practices" and "Bad Complexity".

    What is currently here teaches people bad things and reinforces wrong opinions about code.

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    The very first problem and such a poor quality, ouch. I bet a lot of people got frustrated by this. The problem should explicitly specify that each element of the first array can only be used once. It is a critical information to pass the testcases and it's only natural to assume that you can view input arrays as sets (unless EXPLICITLY specified otherwise).