@[Cyq_Lyw_01](/user/670355)
1. pushdown的开头加入：
```cpp
b[t * 2].lazy += b[t].lazy2;
b[t * 2 + 1].lazy += b[t].lazy2;
```
2. update2中删去：
```cpp
b[t].flag = false;
```
[AC记录](https://www.luogu.com.cn/record/132357878)
by EasonLiang @ 2023-10-29 21:06:06
@[EasonLiang](/user/392626) 谢谢谢谢！！！！！！！1
by Cyq_Lyw_01 @ 2023-10-29 21:15:40