Exclusive Cities

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Vicky plans to visit Vickyland. Vickyland is a strange state where a city can be connected either by roads to one or more cities(including itself) or can be completely isolated from other cities. While examining the map of Vickyland a very strange and interesting idea came to his mind. He defines 2 cities A and B to form an exclusive pair of cities if and only if for every other vertex C, either A

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solution.cppC++17

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