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A hand-picked best-of: the single highest-leverage problems from LeetCode, Blind 75, NeetCode, HackerRank, and HackerEarth — every one already has a full walkthrough here.
About this plan
There are thousands of practice problems and most of them teach the same handful of ideas. This sheet is the opposite of grinding: a tightly curated best-of where every problem either defines a reusable pattern or shows up constantly in real interview loops. It is drawn from the strongest entries across Blind 75, NeetCode 150, the LeetCode Top Interview 150, and the HackerRank Interview Prep Kit.
Every problem on this list already has a complete InterviewExplainer walkthrough — clarifying questions, brute-force → optimal, dry-run trace, and line-by-line Java and Python — so there are no "Queued" gaps to slow you down.
Why this sheet
How to use it
The problem set
If you only have a weekend, do these.
Each one teaches a pattern you will reuse a dozen times.
The ones that show up again and again in real loops.
Stretch problems that separate strong candidates.
Keep exploring