This project is the **official** successor and rewritten version of the original Python/Flask version of SYZOJ, which is authorized by the original author [@Chenyao2333](https://github.com/Chenyao2333).
Currently maintained by [LibreOJ](https://loj.ac).
Because of updates to the database structure, users who upgrade from a commit BEFORE [d5bcbe8fb79e80f9d603b764ac787295cceffa34](https://github.com/syzoj/syzoj/commit/d5bcbe8fb79e80f9d603b764ac787295cceffa34) (Feb 21, 2018) **MUST** perform the following SQL on the database.
Who upgrade from a commit BEFORE [26d66ceef24fbb35481317453bcb89ead6c69076](https://github.com/syzoj/syzoj/commit/26d66ceef24fbb35481317453bcb89ead6c69076) (Nov 5, 2018) and not using SQLite **MUST** perform the following SQL on the database.
Who upgraded from a commit BEFORE [84b9e2d7b51e4ed3ab426621b66cf5ae9e1e1c23](https://github.com/syzoj/syzoj/commit/84b9e2d7b51e4ed3ab426621b66cf5ae9e1e1c23) (Nov 6, 2018) **MUST** perform the following SQL on the database. **Notice**: This SQL haven't been tested on a non-MySQL database.
```sql
ALTER TABLE `problem` ADD `publicize_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP AFTER `type`;