Docs & help

From zero to your first graded submission in about two minutes.

How code is shaped on the platform: the Solution class, the C# version and libraries you can use, keyboard shortcuts, and autosave.

Time budgets, allocation tracking, hidden tests, and what each result status means.

What Algorithms, Database / EF, Refactoring, Architecture, Secure Coding, Design Principles, and Test Writing each train, and how each one grades you.

A practical guide to passing the time and allocation gates: pick the right complexity first, then cut the garbage your code leaves behind.

What the Free plan includes, what Pro unlocks, what counts against your daily quota, and how billing and refunds work.

The common stumbling blocks — Run passes but Submit fails, timeouts, compile errors, exceptions — and how to read what the grader is telling you.

Quick answers to the questions people ask most: what the platform is, how grading works, what's free, and how your code and data are handled.