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小弟刚学凸包，问一个关于凸包的问题，请大牛解答// 现在PointSet中y坐标最小的点在PointSet[0]
/* 对顶点按照相对PointSet[0]的极角从小到大进行排序，极角相同
的按照距离PointSet[0]从近到远进行排序 */
这句话不明白，能不能解释一下，谢谢。如果我想用通用算法中的sort，cmp应该怎么写？谢谢。
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