Handshakes

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Sapphire is in the most hysterical mood and is keen on exercising the sparks of his excitement on the guests he has invited on his 12th marriage anniversary. He manages to engage them in a challenge, demanding that they need to get known to each other by means of amiable handshakes, which appears as the best way to commence an interaction among his large number of guests. The guests are $N$ in nu

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solution.cppC++17

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