| ⇢ | A | MessageController added | |
| ⇢ | A | MessageController added | |
| ⇢ | A | MessageModel added |
| ⇢ | C | ExtensionModel::localList() added | |
| ⇢ | B | ProblemModel::discussionDetail() added | |
| ⇢ | A | formatHumanReadableTime() added | |
| ⇢ | A | ProblemModel::formatTime() added | |
| ⇢ | A | ProblemModel::discussionList() added | |
| ⇢ | A | ContestModel::getScrollBoardData() added | |
| ⇢ | A | MessageModel::remove() added | |
| ⇢ | A | ProblemController::discussionPost() added | |
| ⇢ | A | MessageModel::read() added | |
| ⇢ | A | MessageModel::list() added | |
| ⋮ | view more | ||
| B | ↘ | C | ProblemModel::detail() got worse |
| A | ↛ | AnnouncementModel::formatPostTime() removed | |