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回答你的疑问 :)

Posted by xuhanqiu at 2008-12-03 08:15:11 on Problem 3259 and last updated at 2008-12-03 08:15:45
In Reply To:题目有点难懂. Posted by:ecjtuwf at 2008-10-02 21:25:38 
差不多就是这个意识啦。
这题考察两点:
1.创建图G --- 需要判断边的权值，保存最小的
2.判断一个有向图G是否存在负权回路 (思想: 引入一个超级源点s调用bellman-ford)
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