History of question #199303
| When | Who | Action | New State |
|---|---|---|---|
| Yaguang Tang | Answer | Answered | |
| Guangya Liu | Reopen | Open | |
| Yaguang Tang | Answer | Answered | |
| Guangya Liu | Confirm | Solved | |
| Guangya Liu | Reopen | Open | |
| Yaguang Tang | Answer | Answered | |
| Édouard Thuleau | Comment | Answered | |
| Tiantian Gao | Comment | Answered | |
| Yaguang Tang | Answer | Answered |
