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SRM 630 1000pts 貌似是这道题的加强版。。。。SPFA可以搞掂

Posted by JiaJunpeng at 2014-08-23 01:22:40 on Problem 2968 and last updated at 2014-08-23 01:24:51 
http://community.topcoder.com/stat?c=problem_statement&pm=13297

0AC。。

对上下界取整 相加再 *0.5就行了。。。
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