Announcement

Please use your student ID as your username when registering.

We collect your student ID, your password, all your submissions and your chat messages.
We also log your activities on this site for security reasons.
All data are available to the TAs and the instructors of the related courses. We only store the hashed value of your password, so the TAs and the instructors cannot see your password. The logs of your activities would never be used for non-security-related reasons.
Your student ID, your submission history (excluding the source code) and all your chat messages are public to everyone. Some of the submissions may be used as the reference solutions and be published with the personal information removed without notice.