Trees make up of Meta interviews. The must-know problems are Vertical Order Traversal, Lowest Common Ancestor (all variants), Diameter with N-ary extension, and Serialize/Deserialize. Use BFS for level-order problems and when order within a level matters. Use DFS for path-based problems and when you need to propagate information up the tree. For BSTs, use the sorted property for pruning. Meta always asks follow-up variants, so understand the core patterns deeply.
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$ curl repovive.com/roadmaps/meta-interview-prep/trees/section-recap
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