样例输出
2和 4
by Shadow_Lord @ 2023-07-07 10:45:01
@[Shadow_Lord](/user/648756) 线段树挂了吧：
```cpp
if(mid>=l)
{
update(l,r,z,a[x].ls);
}
if(mid+1<=r)
{
update(l,r,z,a[x].rs);
}
```
应该是：
```cpp
if(mid>=l)
{
update(l,mid,z,a[x].ls);
}
if(mid+1<=r)
{
update(mid+1,r,z,a[x].rs);
}
```
by XHY20180718 @ 2023-07-10 15:00:41
qry也一样
by XHY20180718 @ 2023-07-10 15:02:59