CodeJudge Core (Online Judge & Sandbox)

Practice algorithms and data structures with automated instant feedback:

• •Select Problem & Track: Choose from curated Data Structures & Algorithms challenges (Two Sum, Valid Parentheses, Binary Search, LRU Cache) or Machine Learning model quantization tracks.
• •Choose Language Runtime: Switch between Python 3 (powered by in-browser Pyodide CPython 3.12 WebAssembly) and JavaScript (native V8 engine).
• •Run Test Cases: Click 'Run Tests' to validate your solution against visible sample inputs and inspect standard output (`stdout`) and execution times.
• •Submit for Final Assessment: Submit your code to execute against comprehensive hidden test cases evaluating asymptotic time complexity (O(N) vs O(N²)) and memory bounds.
• •Inspect Telemetry: View runtime execution charts, memory consumption, and anti-cheat typing cadence analytics.

Traditional online judges rely on heavy cloud Docker microVMs (like Judge0). CodeJudge Core executes 100% locally in your browser sandbox using compiled WebAssembly:

• •Pyodide WASM Runtime: Downloads a complete CPython interpreter compiled to WebAssembly, providing full standard library support (`math`, `collections`, `itertools`, `heapq`, `json`) without server roundtrips.
• •Isolated Execution Context: JavaScript evaluations run in a dedicated Web Worker sandbox with overridden globals (`eval`, `Function`, `fetch` disabled) to prevent DOM interference.
• •Execution Limits: Enforces configurable per-problem CPU timeouts (e.g. 2,000ms) and infinite loop interrupt guards using WebAssembly execution counters.

To support academic integrity during campus assessments and hiring screenings, CodeJudge captures typing cadence, Words-Per-Minute (WPM) burst variance, and sudden paste events. An N-gram Abstract Syntax Tree (AST) similarity engine compares submitted solutions against benchmark baselines.