并查集算法主要实现在若干个不相交集合中的两个操作：第一判断一个集合是否在另一个集合中，第二合并两个不相交的集合-A union-find algorithm is an algorithm that performs two useful operations on such a data structure:1. Find: Determine which set a particular element is in. 2. Union: Combine or merge two sets into a single set.