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A camera captures a crowd of people in a x-axis，total N people are captured as a a rectanglular image and can be represented by a row that informs start, end and height，where start is the starting position on x-axis, end is the ending position on x-axis and height is the height of the person. Since they are in a crowd the person may overlap as we see them from a position far away，we need to compre

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solution.cppC++17

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