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ConvexHull
- 凸包(ConvexHull)就是把给定点包围在内部的,面积最小的凸多边形。时间复杂度为O(n)先计算凸包,输入点数组p,点个数为n,输出点数组ch。函数返回凸包顶点数。(The convex hull (ConvexHull) is the smallest convex polygon that surrounds the point to its interior. The time complexity is O (n). First, the convex hull is compute