Frequent Flyer

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It's time to plan for your next great vacation. There are N cities in the world (numbered from 1 to N). You live and work in city 1 and you need to choose another city for your vacation. There are M uni-directional flights available between the cities. As a loyal frequent flyer of your favorite airline, you may enjoy the special offer with your bonus mileage: - You may purchase a flight ticket a

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