Corona and Planet G

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Corona virus is spreading at a fast pace in *Planet G*. Thankfully the government has come up with a vaccine and wants to test it. The vaccine has a unique quality, it works in the city it is tried on and also spread its effect on every city which is directly connected by a road to the city upon which the vaccine was tried. The government at planet G wants to maximize the number of city which gets

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solution.cppC++17

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