Darbar 397 — Binary Tree Preorder Traversal

Easy

Darbar · Stack

Catalog slot 397 of 548 (source id 130). Topic stack / binary tree based.

Solve on LeetCode: Binary Tree Preorder Traversal. Do not treat this page as a statement dump.

Aligned T2T band: weeks 1–6. Start at Week 1. Full map: Darbar hub.

Pattern block: Advanced and interview fusion (weeks 61-90, slots 361-470). Warmup: Classic DP and greedy patterns. Exam: Mixed 4-problem block mirroring a real interview.

Also filed under: trees / binary tree.

Evidence (cookiecutter problem_397.md)

1. Attempt log (approaches that failed)
2. Final complexity (time and space)
3. One mistake corrected
4. Production concept this slot reinforces

Personal dates and the CSV tracker stay in the learner journal.

Same subtopic

• Increasing Order Search Tree · easy
• Binary Tree Inorder Traversal · easy
• Binary Tree Postorder Traversal · easy
• Palindrome Linked List · easy

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