Union Find
128 Longest Consecutive Sequence130 Surrounded Regions200 Number of Islands261 Graph Valid Tree305 Number of Islands II323 Number of Connected Components in an Undirected Graph547 Friend Circles684 Redundant Connection685 Redundant Connection II695 Max Area of Island721 Accounts Merge737 Sentence Similarity II765 Couples Holding Hands803 Bricks Falling When Hit
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