BFS (some may be solved by union find)
😅297. Serialize and Deserialize Binary Tree314 binary tree vertical order traversal🤣133 clone graph😲323 Number of Connected Components in an Undirected Graph (using union find~)😮130 surrounded regions752 open the lock😫815 Bus Routes😮542 01 Matrix1293. Shortest Path in a Grid with Obstacles Elimination417 pacific atlantic water flow
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