Sum of Product

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Vinish did extremely well at the last year NPL. As a reward, he was given n candy bars with ith bar having strength A[i]. He was allowed to select exactly 2 candy bars and the power received by eating them is equal to product of their strength. Vinish wonders what is the sum of power by selecting all the possible combination of 2 candies. Input The first line of the input contains an integer T

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solution.cppC++17

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