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顶。还有用-1判无解或者never的要注意了。

Posted by yygy at 2014-07-08 09:49:46 on Problem 3878
In Reply To:WA了差不多20次,注意建图的时候出口处不要向外连边。 Posted by:Jun_Geng at 2014-05-02 20:30:36


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