Solve your first problem

1. Open Problems and pick an Easy one to start.
2. Choose your language in the editor (12 are supported).
3. Write your solution. Press Run to test against the sample cases — you'll see pass/fail per case plus runtime.
4. Press Submit to judge against the full hidden test suite. A passing submission awards XP and may unlock badges.

Stuck? Open the AI Mentor panel for a progressive hint that nudges you toward the idea without spoiling the solution. See AI Mentor.