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请问下面的有向图如何加边才能成为强连通??

Posted by mmx21 at 2011-04-13 13:40:14 on Problem 1236
四条有向边:1-->3,4 2-->4,5

       1     2
      / \   / \
     /   \ /   \
    3     4     5
出度为0的个数为3,入度为0的个数为2,那么加三条边就可以了,这图应该怎么加边?

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