Devu, his friends and birthday gifts

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You might have realized up to now that some of the Devu's friend are really weird. It is Devu's 22nd birthday today. His friends are coming to his home for his birthday party. Some of his friends are so shameless that instead of giving him a gift, they even ask gifts from him. Devu has n friends. He wants to invite some of his friends in the party. Devu knows beforehand that ith friend will give

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solution.cppC++17

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