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你这样一说我也明白为什么要附加点了,呵呵,保证图联通。

Posted by yangguo981 at 2006-12-01 21:52:38 on Problem 1364
In Reply To:终于过了一道差分约束。。。开始构造了一个不连通的约束图,负环无法从起点到达,于是才明白为什么需要一个附加点 Posted by:bigheadghost at 2006-11-15 16:26:18


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