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spfa 一A~~摘自M.J的blog: 只要在建图的时候，如果两个city属于一个group，就建双向图，否则就建从属于group1的city到属于group2的city的单向图。原因很简单，因为两种情况都不会 出现从2到1的情况。建好图然后就简单了，注意无解的情况。 Followed by:
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