BFS (some may be solved by union find)

๐Ÿ˜…297. Serialize and Deserialize Binary Tree314 binary tree vertical order traversal๐Ÿคฃ133 clone graph๐Ÿ˜ฒ323 Number of Connected Components in an Undirected Graph (using union find~)๐Ÿ˜ฎ130 surrounded regions752 open the lock๐Ÿ˜ซ815 Bus Routes๐Ÿ˜ฎ542 01 Matrix1293. Shortest Path in a Grid with Obstacles Elimination417 pacific atlantic water flow
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