History of question #660175
| When | Who | Action | New State |
|---|---|---|---|
| Olivier Mattelaer | Answer | Answered | |
| Xiaojun Yao | Reopen | Open | |
| Olivier Mattelaer | Answer | Answered | |
| Xiaojun Yao | Reopen | Open | |
| Olivier Mattelaer | Answer | Answered | |
| Xiaojun Yao | Reopen | Open | |
| Olivier Mattelaer | Answer | Answered | |
| Xiaojun Yao | Confirm | Solved |
