@[GavinCQTD](/user/770431)
hack:
```
bac
ABC
```
by yanhao40340 @ 2024-04-14 10:03:38
@[GavinCQTD](/user/770431) 子序列不能改变顺序
by yanhao40340 @ 2024-04-14 10:07:43
@[yanhao40340](/user/674721) 哦哦哦 thx
by GavinCQTD @ 2024-04-14 10:42:08
**此贴结**
by GavinCQTD @ 2024-04-14 10:42:26