An online judge server I contributed to, built with C++ and MySQL and improved around resource management, memory safety, and frontend modernization.

A VS Code helper extension built for Hydro users to retrieve problems, manage code, and connect Hydro with a local competitive-programming workflow.

A structured search and download service for Shanghai school textbooks, workbooks, and related learning resources.

A native mini app for the Youdao Dictionary Pen, involving device integration, C++, and embedded constraints.

A machine-learning model and inference implementation for recognizing Luogu captchas.

A discontinued mathematics solver whose source remains available for reference.