HKOI 及外地比賽
- HKOI Facebook 專頁: https://www.facebook.com/hkoi.org
- HKOI 網上評測系統: https://judge.hkoi.org
- 國際電腦奧林匹克競賽 (IOI): https://www.ioinformatics.org/
- 全國青少年信息學奧林匹克競賽 (NOI): http://www.noi.cn
- 國際大都會奧林匹克 (IOM): http://megapolis.educom.ru/en
- 其他國家: http://olympiads.win.tue.nl/ioi/noi/
編程工具及參考
- Orwell Dev-C++: https://orwelldevcpp.blogspot.hk/
- Code::Blocks: http://www.codeblocks.org/
- C++ 參考: https://www.cplusplus.com/
- Free Pascal: https://www.freepascal.org
- Eclipse: https://www.eclipse.org/
- Java 參考: https://docs.oracle.com/en/java/javase/14/docs/api/index.html
- Python 參考: https://docs.python.org/3/reference/
- Visual Studio Code: https://code.visualstudio.com/
其他網上評測系統
- Codeforces: https://codeforces.com/ (推薦)
- AtCoder: https://atcoder.jp/ (推薦)
- HackerRank: https://www.hackerrank.com/ (推薦)
- Sphere Online Judge: https://www.spoj.com/
- CodeChef: https://www.codechef.com/
- LeetCode: https://leetcode.com/
- Kattis: https://open.kattis.com/
- USACO Training Program Gateway: https://train.usaco.org/usacogate
- ACM Problem Set Archive: https://uva.onlinejudge.org/
- Peking University Online Judge: http://poj.org/