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求出的凸包的点的个数为负数也能AC呀,ft!!!

Posted by ecjtubaowp at 2007-06-02 09:56:33 on Problem 1113 
对于这组数据
7 100
0 0
1 2
1 0
3 4
2 0
2 4
5 0

求得的点的个数为-994
结果为633
而我另一个算法求得结果为:点的个数为4,结果为643
这是怎么回事呀
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