他不能加
在add的时候,不更新答案
by 2024yourfather @ 2023-08-21 20:27:54
然后还要回滚
by 2024yourfather @ 2023-08-21 20:28:12
https://www.luogu.com.cn/problem/P5906
by 2024yourfather @ 2023-08-21 20:29:04
建议您先写这题
by 2024yourfather @ 2023-08-21 20:29:43
@[2022yourfather](/user/743156) 额,这题好像不需要回滚。。。
by ChickenDrinkingMilk @ 2023-08-21 21:10:50
@[2022yourfather](/user/743156) 啊我知道哪错了,是del(R--)不是del(--R)
by ChickenDrinkingMilk @ 2023-08-21 21:13:37
@[HardsoftCyril](/user/494192) 好吧,我写的是回滚
by 2024yourfather @ 2023-08-21 21:15:16