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An algorithm is a sequence of well-defined steps that defines an abstract solution to a problem. Use this tag when your issue is related to design and analysis of algorithms.
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Efficient algorithms for vertical visibility problem
I don't have a linear algorithm, but this one seems to be O(m log m).
Sort the segments based on the first coordinate and height. This means that (x1, l1) always comes before (x2, l2) whenever x1 < …