Maximum Frequent Subarray Sum

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### Read problem statements in [Vietnamese](https://www.codechef.com/download/translated/JUNE21/vietnamese/MFSS.pdf), Akash has just learned the maximum subarray sum problem. And while thinking about the solution, he came up with a new problem, the maximum frequent subarray sum problem. In this problem, you will be given an array $A$ of $N$ integers. You have to choose a non-empty subarray with

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solution.cppC++17

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