Prateek in war

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After a lot of years of hardships, Prateek has gathered a mighty army of soldiers. You as his advisor must help him in developing a strategy for battle. The no of soldiers in Prateek's army is N and the strength of the ith soldier is Ai. Prateek always sends his soldiers in pairs. So he can send ith and jth soldiers together given i ≠ j. The cumulative strength of this pair of soldiers would be A

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solution.cppC++17

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