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仁兄一定要看好改变流量的是哪一条边

Posted by P1115876559 at 2016-04-28 17:08:44 on Problem 3068
有可能出现
1-->2  12
1-->2  13
两条边
求最短路用的是12的那一条
结果改变的是13的那一条(冤死)
最后就会导致结果变小了

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