This 13-year-old Thai student solves Codeforces rating 800 problems in C++ in 45 seconds through an AI agent he built himself on Claude Code and posted to an open GitHub repo.He sits in a regular school room with a MacBook Air on the desk, a silent HHKB Type-S keyboard for $300, and a timer in the frame.In the browser Codeforces is open, in VS Code an empty .cpp file, and in the corner of the screen a Claude Code window.No algorithm tutor, no competitive programming course, and not a single line