POJ 2186 Popular Cows（圖論之強連通分量）

強連通分量之於有向圖，與並查集之於無向圖，在概念上極其相似，都是尋找互相聯繫的小部分內容。 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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