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Update geometry/graham_scan_algorithm.cpp

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Co-authored-by: David Leal <halfpacho@gmail.com>
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Lajat5 2021-11-08 12:07:37 +05:30 committed by GitHub
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geometry/graham_scan_algorithm.cpp
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* remove concave points on this path using orientation. The first two points in * remove concave points on this path using orientation. The first two points in
* sorted array are always part of Convex Hull. For remaining points, we keep * sorted array are always part of Convex Hull. For remaining points, we keep
* track of recent three points, and find the angle formed by them. Let the three * track of recent three points, and find the angle formed by them. Let the three
*points be prev(p), curr(c) and next(n). If orientation of these points * points be prev(p), curr(c) and next(n). If the orientation of these points
*(considering them in same order) is not counterclockwise, we discard c, * (considering them in the same order) is not counterclockwise, we discard c,
* otherwise we keep it. * otherwise we keep it.
* *
* @author [Lajat Manekar](https://github.com/Lazeeez) * @author [Lajat Manekar](https://github.com/Lazeeez)