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Data Structures & Algorithms

Pattern-first path for 2026 interviews. Progress stays in this browser.

Start with Big O

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The path

Four tracks, top to bottom. Every node is a lesson — no pan-zoom graphic.

  1. 01
    Foundations

    How to measure cost, then the structures every later pattern sits on.

  2. 02
    Patterns

    The 2026 interview loop: recognize the shape, name the pattern, write the bound.

  3. 03
    Graphs & DP

    Trees, graphs, union-find, then 1D/2D dynamic programming and greedy.

  4. 04
    Interview sets

    Pattern-grouped practice loops for intern vs senior — original prompts, no branded lists.

Questions

Frequently asked questions

Who is this DSA hub for?

Beginners who need a sequence, and people prepping interviews who want pattern names, complexity, and intern vs senior signal — without an account.

Is it free? Do I need to sign up?

Yes, free. Progress is stored in this browser with localStorage. No signup, no cloud sync.

How should I follow the tracks?

Foundations first, then Patterns, then Graphs & DP. Interview sets are practice loops, not a substitute for the lessons. Skip a lesson only if you can already explain its “when to use” line out loud.

What language are the examples in?

JavaScript/TypeScript on the older visualizers; newer pattern lessons include JS and Python. The ideas are language-agnostic.