DSA Prep Companion

Master patterns, recognize strategies, ace your coding interviews.
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Learning Roadmap

Your structured path to mastering data structures and algorithms.

Select a pattern from the sidebar to read its guide

Select a pattern from the sidebar to start practising

Pattern Recognition Game

Train your speed in spotting DSA patterns and matching their optimal complexities.

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Spaced Repetition Flashcards

Test yourself on "When to Use" and complexities. Leitner box system will schedule cards based on your mastery.

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⚡ Patterns Shortcuts

Quick recognition reference sheet, essential templates, and interviewer checklist.
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Code Execution
Java Execution

Code is compiled and executed on our server via Judge0. No API key required from you — it's handled server-side.

How it works

You write or edit the Java code in the editor
Click ▶ Run — code is sent to our execution server
Output (stdout, errors, time, memory) appears in the console below