Darbar 447 — Count Substrings That Differ By One Character

Medium

Darbar · String

Catalog slot 447 of 548 (source id 386). Topic string / 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: 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: hash table / dp based.

Evidence (cookiecutter problem_447.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

• Is Subsequence · easy
• Generate Parentheses · medium
• Number Of Good Ways To Split A String · medium
• Different Ways To Add Parentheses · medium

String index · Darbar hub

Darbar slot 447 of Tensor-to-Tenant · Previous · Next.