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 Graph399 Evaluate Division547 Friend Circles684 Redundant Connection685 Redundant Connection II695 Max Area of Island721 Accounts Merge737 Sentence Similarity II765 Couples Holding Hands778 Swim in Rising Water803 Bricks Falling When Hit839 Similar String Groups924 Minimize Malware Spread928 Minimize Malware Spread II947 Most Stones Removed with Same Row or Column952 Largest Component Size by Common Factor959 Regions Cut By Slashes
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