Darbar 209 — Count Substrings That Differ By One Character
Medium
Darbar · Hash Table
Catalog slot 209 of 548 (source id 714). Topic hash table / dp based.
Solve on LeetCode: Count Substrings That Differ By One Character. 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: Tree and graph fluency (weeks 31-45, slots 201-280). Warmup: Tree traversals and adjacency-list graph walks. Exam: Tree+graph block with one design flavored problem.
Also filed under: string / dp based.
Evidence (cookiecutter problem_209.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
- Longest String Chain · medium
- Total Appeal Of A String · hard
Darbar slot 209 of Tensor-to-Tenant · Previous · Next.