Set 33 - Stack LC #20
Use Practice Loop if you need a reset.
Problems
| Problem | Difficulty | Pattern | Video |
|---|---|---|---|
| LC 20. Valid Parentheses | Easy | Stack & Monotonic Stack | Video |
Deliverables
- Write a 1-line invariant for each problem.
- Note 1 edge case or pitfall per problem.
- Record time-to-first-correct solution.
Notes
- LC 20: stack for matching brackets.
Review
- Time spent + where you got stuck?
- Biggest mistake or missed edge case?
- One concrete improvement for next time.
Comments
Share your approach or ask questions
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