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用这个id凑足70个提交吧

Posted by ACM29353 at 2005-05-22 21:38:05 on Problem 2099
In Reply To:真是wa得不行了，40天前贡献了4X次WA和TLE，今天又来4个WA，到底应该怎么做？ Posted by:frkstyc at 2005-05-22 20:43:37 
> 我现在是用对角线来算，假定两个平行四边形的中心是重合的，求出postcard的两条对角线分别在envelope里面能摆放的角度的区间，再根据夹角的关系求区间的交
> 头疼的题目啊！！！！NEERC的网站里居然下不到解答和数据（最bt的是2003年的居然就可以下载）
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