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思路

Posted by yc0576 at 2012-11-23 19:32:48 on Problem 2186
强连通后缩点找出度为0的点个数
然后讨论
如果没有,那就是全都是。
如果只有1个点,那么这个id的牛都是
如果有多个,那么都不是

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