Welcome to Algorithm OJ!

For better user experience and access to all features, we recommend that you use the Chrome or some modern browsers, and the best version is not lower IE 8+, Chrome 48+, Firefox 45+ and Safari 8+
If you need help, please click Frequently Asked Questions
Enjoy and have fun!

Latest News [more...]

Hello World !

Here's where we'll put our latest news! [...]

Todo list

  1. Virtual Judge on many other OJs
  2. Class/Interactive Module

Running Contests

2025-暑假-CSP-J班-综合训练-作业一 ends at 2025-07-12 22:00:00
2025-暑假-基础提高班-作业一 ends at 2025-07-13 22:00:00
2025-暑假-CSP-J班-综合训练-作业二 ends at 2025-07-13 22:00:00
2025-暑假-基础提高班-作业二 ends at 2025-07-14 22:00:00
2025-暑假-CSP-J班-综合训练-作业三 ends at 2025-07-14 22:00:00

Upcoming Contests

2025-暑假-基础提高班-作业七 at 2025-07-13 08:00:00
2025-暑假-CSP-J班-综合训练-作业八 at 2025-07-13 15:00:00