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弱问题：如何求凸包？我是先找这些点中，y最小的那一个，然后从这个点出发依次遍历所有点 用一个数组记录凸包中的点 相邻两条边做叉乘，如果结果是负数就将新点算上，如果不是，就将钱一个点删去 any thing wrong? Followed by:
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