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就是求SCC，然后再数一下支持数

Posted by frkstyc at 2005-09-01 10:50:34 on Problem 2186
In Reply To:这个题是不是求强连通分量，再把每个强连通分量分别看成一个点，再看度为0的强连通分量里面的点的个数 Posted by:knuthocean at 2005-09-01 10:37:55 
> ：不会
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