POJ 2186 Popular Cows（图论之强连通分量）

强连通分量之于有向图，与并查集之于无向图，在概念上极其相似，都是寻找互相联系的小部分内容。 POJ 2186 Popular Cows Description Every cow's dream is to become the most popular cow in the herd. In a herd of N (1 <= N <= 10,000) cows, you are given u

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