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奇怪的是，把求多边形面积加个小于3返回0的特判久过了，附组数据

Posted by lanzongwei at 2020-03-14 17:43:12 on Problem 1279 
求巨佬指教，
顺便带一个隔壁3335的数据

1
17 2 -1  2 -2  1 -2  0 -1  -1 -2  -2 -2  -2 -1  -1 0  -2 1  -2 2  -1 2  0 1  1 2  3 2  3 1  2 1  1 0

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