https://zhuanlan.zhihu.com/p/125604577
https://github.com/azl397985856/leetcode/blob/master/thinkings/union-find.md
https://leetcode-cn.com/problems/longest-consecutive-sequence/solution/tu-jie-yu-dao-jiu-shen-jiu-bing-cha-ji-by-chun-men/
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