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看懂了 应该是利用向量的，怎么证明的哈？

Posted by first at 2006-04-11 12:55:04 on Problem 2812
In Reply To:S = 0.5*Sum(p[i].x * p[(i+1)%N].y - p[i].y*p[(i+1)%N].x) Posted by:Sempr at 2006-04-11 07:10:01 
> 希望没打错
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