The DSA practice workspace for patterns and companies.
Master 41 algorithmic patterns and 423 company problem sets in one distraction-free, offline-first workspace. Zero sign-up walls, zero telemetry, and instantaneous local persistence.
Intuition: Two pointers with last seen index map. Shrink window when duplicate occurs.
Intuition: Maintain frequency count and matched character quota. Expand right, shrink left.
41 algorithmic templates. Stop grinding disconnected questions.
When you recognize the invariant pattern, the implementation writes itself. Every single topic is classified by high return-on-investment and real-world frequency.
Sliding Window
Algorithmic Invariant
Dynamic or fixed-size boundary expansion for contiguous sub-arrays.
Canonical Benchmark Problem
423 company archives. Exact question frequency.
Filter directly by the specific company where your next round is scheduled. See exact question counts and difficulty distributions.
Amazon
Meta
Microsoft
Uber
Apple
Goldman Sachs
Stripe
Engineered for zero latency and continuous focus.
No cloud accounts to manage, no passwords to forget, and zero tracking scripts. Everything runs in your browser engine with dual-tier local persistence.
Dual-Tier Local Storage
IndexedDB backed by Dexie.js for heavy problem state, paired with synchronous localStorage backups. Your progress survives browser restarts and operates completely offline.
Integrated Approach Notes
Write intuition summaries, corner-case notes, and custom time/space complexities directly alongside each problem. No need to context switch to external note apps.
Instantaneous Searching
Filter across 17,000+ problem pairings in under 4 milliseconds. Everything is pre-indexed in-memory so there are zero loading spinners or API latency.
Ready to practice with systematic clarity?
No account creation. No credit card. Launch the workspace right in your browser and start checking off problems immediately.