Darbar 220 — Substrings Of Size Three With Distinct Characters

Easy

Darbar · Hash Table

Catalog slot 220 of 548 (source id 699). Topic hash table / sliding window.

Solve on LeetCode: Substrings Of Size Three With Distinct Characters. 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 / sliding window.

Evidence (cookiecutter problem_220.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

• Contains Duplicate Ii · easy
• Number Of Substrings Containing All Three Characters · medium
• Sliding Window Median · hard
• Minimum Window Substring · hard

Hash Table index · Darbar hub

Darbar slot 220 of Tensor-to-Tenant · Previous · Next.