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Week 3Saturday 19 SeptemberTrees

Day 15: Binary trees

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Coding bfs

Level Order + Zigzag

LC 102, 103. Queue + level size. Zigzag with a deque or reverse flag.

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LC 102LC 103BFS
Coding tree

Lowest Common Ancestor

LC 236. Recurse: if node is p or q, return it. Combine left/right.

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LC 236Binary treesBlind 75
Coding tree

Serialize / Deserialize Tree

LC 297. Preorder with nulls, or BFS. Round-trip a skewed tree.

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LC 297Binary treesBlind 75