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问题就出在最后一条边上

Posted by 405040574 at 2010-09-20 20:53:42 on Problem 1228 
普通模板不能把最后一条边上的不是顶点的点加入到凸包中，看看这组数据：
6
0 0
1 0
2 0
1 1
0 2
0 1

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