Chef and Bike

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In Chefland, there are n cities and m one-way roads between cities. The chef will travel between cities along these roads using a very unusual bike. The circumference of the front wheel is n (the same as the number of cities) yet the circumference of its rear wheel is only n - 1. We think of the circumference of each wheel as being broken up into equal-spaced positions. So the front wheel has posi

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solution.cppC++17

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