Darbar 503 — Binary Tree Preorder Traversal

Easy

Darbar · Trees

Catalog slot 503 of 548 (source id 439). Topic trees / binary tree.

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

Aligned T2T band: weeks 46–57. Start at Week 46. Full map: Darbar hub.

Pattern block: Mock and personal gauntlet (weeks 91-108, slots 471-548). Warmup: Two-problem blocks (45 min). Exam: Full mock interviews scored on a rubric.

Also filed under: stack / binary tree based.

Triangulation — Trees: Darbar speed is Traversal, LCA, tree DP; Forge depth is Euler Tour, HLD, DSU on Tree; production artifact is Agent-execution forensics.

Evidence (cookiecutter problem_503.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

• Root Equals Sum Of Children · easy
• Increasing Order Search Tree · easy
• Binary Tree Postorder Traversal · easy
• Binary Tree Tilt · easy

Trees index · Darbar hub

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