Santa and his gifts

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It's Christmas eve and Santa is back to give away the gifts to a kid. There were two boxes full of gifts. The kid can choose two gifts, one from each box. The box 1 has m gifts and box 2 has n gifts. All the gifts in both the boxes are unique. Santa also poses a question, only answering upon which the kid can claim the gifts. Santa asks how many pairs of gifts the kid can take. The kid, being a ki

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solution.cppC++17

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