Codility每周一课：P99.5 PolygonConcavityIndex

P99.5 PolygonConcavityIndex Check whether a given polygon in a 2D plane is convex; if not, return the index of a vertex that doesn’t belong to the convex hull. P99.5 凸包内点 判断一个多边形是否是凸多边形，不是的话，返回在凸包内部的点

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