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A problem statement, a real editor, graded tests, and several worked solutions with complexity for every problem. Python runs in your browser — real CPython, no submissions, no waiting on a queue.
CPython via Pyodide in a worker. An infinite loop costs you the worker, not the tab.
Each published solution is executed against every test for its problem. A solution that fails is a build failure.
Solved marks, drafts and notes are saved to your account and sync across the machines you sign in on.
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