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第一道差分约束系统

Posted by COfrost at 2011-04-08 21:11:10 on Problem 1364
纪念纪念 搞懂了差分约束系统 复习了SPFA判负环、、
个人觉得仅仅判负环 无需超级源点 
但建起来还是比较好 既可以求解也可以判负环。  

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