VS Code extension
CPH-NG
Current flagship
A VS Code extension for competitive programming with sample retrieval, judging, stress tests, and multi-platform submission.
High school developer · Shanghai
Langning Chen
Making competitive-programming tools more reliable and useful
I am a Grade 12 student and open-source developer working across competitive programming, developer tools, modern web systems, and a growing Rust practice.
Pudong, Shanghai · UTC+8
Current focus: CPH-NG
~/about/langningchen
Selected work
Reliable tools for real needs
CPH-NG and XMOJ Script are my two most representative projects.
Browser userscript
XMOJ Script
Important earlier work
A browser userscript improving problem solving and discussions on XMOJ, now maintained by XMOJ-Script-dev.
JavaScript
0
0
Updated Oct 2026
Contribution record
View the full contribution recordPublic contribution activity is currently unavailable
Open source
Project use and public collaboration
A view of public repositories, project interest, and recent coding focus. Every metric opens into its source.
GitHub profile
github.com/langningchen
Open-source projects, experiments, issues, and collaboration records are all kept public here.
Selected repository languages
C++
32.8%TypeScript
23.7%JavaScript
20.6%Jupyter Notebook
18.3%HTML
3.0%C
1.6%Primary development languages
8 selected projects
WakaTime coding languages
C++
38.7%TypeScript
25.4%JavaScript
9.2%Python
3.0%PHP
1.6%Rust
1.5%3,238 hrs 0 mins
Daily average 2 hrs 49 mins
Community work
Contributing beyond the repositories I own
These projects come from public pull-request and issue search results, covering code fixes, platform compatibility, feature proposals, and bug reports.
Toolkit
A complete toolkit from contest code to product delivery
Alongside TypeScript, C++, JavaScript, and Python, I have started working with Rust while continuing to build extensions, web products, and edge infrastructure.
Languages
TypeScript
C++
JavaScript
Python
Rust
C
Product engineering
Next.js
React
Node.js
MUI
VS Code Extensions
Userscripts
Infrastructure
Cloudflare
GitHub Actions
Linux / WSL
Docker
pnpm
Git
Competitive programming
Training and contest record
From CSP-J to NOIP, higher-level training has connected algorithm study, contest review, and improvements to the tools I build.
4,029
OIerDB rank
5,824.95
OIerDB score
Level 7
CCF proficiency
Contest record
| Event | Award | Score | National rank |
|---|---|---|---|
NOIP 2025 | Second prize | 118 / 400 | 2,513 / 7,548 |
CSP-S 2025 | First prize | 228 / 400 | 1,537 / 30,497 |
NOIP 2024 | Third prize | 107 / 400 | 2,801 / 7,510 |
CSP-S 2024 | Second prize | 160 / 400 | 5,152 / 27,521 |
CSP-S 2023 | First prize | 175 / 400 | 1,760 / 19,202 |
CSP-J 2021 | Second prize | 200 / 400 | 3,890 / 14,931 |
Game profiles
I am a Traveler and Trailblazer too
Records from adventures across Teyvat and journeys aboard the Astral Express.
Journey
School, competition, and open source all move the next step forward
Learning environments, algorithm training, and feedback from real users connect to shape how I understand problems and build systems.
01 / 05
2024 · Present
Caoyang No. 2 High School
Now in Grade 12, continuing OI training while developing CPH-NG and participating in OJ, Hydro, and other open-source projects.
School website
01 / 03
2020 · 2024
Jianping West Middle School
I began competitive programming in Grade 7 and gradually turned an interest in code into sustained algorithm training and project work.
School website