```cpp
void spread(ll x){
if(st[x].lazy!=0){
st[x*2].sum+=st[x].lazy*(st[x*2].r-st[x*2].l+1);
st[x*2+1].sum+=st[x].lazy*(st[x*2+1].r-st[x*2+1].l+1);
st[x*2].lazy=st[x].lazy;
st[x*2+1].lazy=st[x].lazy;
st[x].lazy=0;
}
}
```
你的懒惰标记下穿有问题
要改成加等于
```cpp
void spread(ll x){
if(st[x].lazy!=0){
st[x*2].sum+=st[x].lazy*(st[x*2].r-st[x*2].l+1);
st[x*2+1].sum+=st[x].lazy*(st[x*2+1].r-st[x*2+1].l+1);
st[x*2].lazy+=st[x].lazy;
st[x*2+1].lazy+=st[x].lazy;
st[x].lazy=0;
}
}
```
by fzwfzwfzw @ 2019-10-06 14:19:15
@[一念之间、、](/space/show?uid=174399)
蟹蟹蟹蟹
by Demoe @ 2019-10-06 14:21:39
@[一念之间、、](/space/show?uid=174399)
请问题目说的是n<=100000可是开了Nx4后RE了，为什么开到200000x4才可以
by Demoe @ 2019-10-06 14:24:47
```
st[x*2].lazy=st[x].lazy;
st[x*2+1].lazy=st[x].lazy;
```
应该是+=
by AquaRio @ 2019-10-06 14:26:45
可能是玄学数据吧
平时打代码的时候习惯开大一点，不会炸的
by fzwfzwfzw @ 2019-10-06 14:27:08
@[Daniel_Jiang](/space/show?uid=83999) 哦...我来晚了qaq
by AquaRio @ 2019-10-06 14:27:12
~~@[Daniel_Jiang](/space/show?uid=83999) 玄学~~
by AquaRio @ 2019-10-06 14:28:00
@[AquaRio](/space/show?uid=145596) 也感谢大佬QwQ
by Demoe @ 2019-10-06 14:28:28
@[Daniel_Jiang](/space/show?uid=83999) 我有能天使（
by AquaRio @ 2019-10-06 14:34:59
@[AquaRio](/space/show?uid=145596) 我也有（精一70（（（
by Demoe @ 2019-10-06 14:37:55