Darbar 321 — Swap Nodes In Pairs
Medium
Darbar · Linked List
Catalog slot 321 of 548 (source id 27). Topic linked list / recursion.
Solve on LeetCode: Swap Nodes In Pairs. Do not treat this page as a statement dump.
Aligned T2T band: weeks 31–45. Start at Week 31. Full map: Darbar hub.
Pattern block: Data-structure mastery (weeks 46-60, slots 281-360). Warmup: Standard-library structure drills. Exam: Structure-selection exam with 2-3 advanced problems.
Evidence (cookiecutter problem_321.md)
- Attempt log (approaches that failed)
- Final complexity (time and space)
- One mistake corrected
- Production concept this slot reinforces
Personal dates and the CSV tracker stay in the learner journal.
Same subtopic
- Add Two Numbers · easy
- Merge Two Sorted Lists · easy
- Convert Binary Number In A Linked List To Integer · medium
- Remove Duplicates From Sorted List · easy
Linked List index · Darbar hub
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