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用半平面交做的，可以看看这个牛人的代码，1e-8就行

Posted by 378844395 at 2012-07-12 17:49:54 on Problem 1755 and last updated at 2012-07-12 17:51:24
In Reply To:此题极度坑爹，精度要eps=1e-16…… Posted by:xuhaoran510 at 2011-06-25 14:29:33 
> rt
用半平面交做的，可以看看这个牛人的代码，1e-8就行
http://blog.csdn.net/trochowski/article/details/7560035#cpp
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