數據結構 pac 簡單的 .cn 並集 包含 集合 nbsp ace

並查集就是一種一邊查找一邊並集的數據結構，簡單的並查集經常應用於朋友圈等題目，即：x和y是朋友，y和z是朋友，則x和z是朋友，下面給出一組數據表示xx和yy是朋友，最後問一共有多少個朋友圈。這類問題一般用並查集解決比較快。下面明確並查集做的事情： 1.查集，即查找某個元素是否包含在一個集合裏面 2.

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