We used to use three domains, yicode.org, yicode.org.cn, and yicode.ac. To improve future user experience, we have migrated all services under yicode.ac to yicode.org. Most of the migration should be automatic and seamless, however, if you do discover any problem, you could always manually change yicode.ac to yicode.org to access the intended services. No change has taken place for services under yicode.org.cn.

We apologise for any inconvenience. Thank you for your attention.