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47+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes balanced tree checks, bst search insert delete, level order bfs, lowest common ancestor, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Trees appear in roughly half of all fresher-to-junior coding rounds. The good news: most tree problems reduce to one of four traversal patterns — inorder, preorder, postorder, or BFS. This module walks through each traversal, then applies them to the problems interviewers love: validate a BST, find the lowest common ancestor, check if a tree is balanced, count nodes at each level. Every solution is shown recursively first (to build intuition), then iteratively with a stack/queue (to show you know both approaches).
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–47 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–47 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q47.