TYLER AND THE FAIR

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Two neighbouring states decided to build a wall between them with some gates to enable the citizens to go from one state to another. Each time a citizen passes through a gate, he has to pay one silver coin. The map of the states can be represented by the first quadrant of a plane and the wall is built along the identity line (i.e. the line with the equation $x = y$). Any point below the wall be

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solution.cppC++17

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