Cool Subsequences

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You are given an array $A$ containing $N$ positive integers. A [subsequence](https://en.wikipedia.org/wiki/Subsequence) of this array is called *cool* if the averages of all non-empty subsequences of this subsequence are present in the complement subsequence. The complement subsequence refers to the subsequence formed by the elements we didn't consider. For example, consider the array $A=[8, 4

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solution.cppC++17

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