CunningShopkeeper

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###Problem description. A group of friends want to buy a box of electrical items. The shopkeeper wants to maximize his number of new customers and the money he makes. To do this, he decides he'll multiply the price of each item by the number of that customer's previously purchased items plus 1 . The first item will be original price (0+1) * original price , the next will be (1+1) * original

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solution.cppC++17

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