Benu and Sale

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In a parallel universe, Bennett University, constructed fully, has a big supermarket named "Fourier Mart." Many students and faculty from different schools come to shop here. The supermarket is having a "Buy 3 get 3" sale today. That means for every three items you buy, you get three more for free. The items can be of varying price. However, they always charge for the 3 most costly items and give

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solution.cppC++17

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