```
void maketag(int id) {
a[id].laz = 1;
a[id].sum += (a[id].r - a[id].l + 1);
}
```
应该改为
```
void maketag(int id) {
a[id].laz += 1;
a[id].sum += (a[id].r - a[id].l + 1);
}
```
因为懒标记可能被更新不止一次
------------
附hack数据
in
```
6 3
1 2
1 3
3 4
4 5
5 6
P 3 6
P 3 6
Q 5 6
```
out
```
2
```
by MAZHIYUAN @ 2023-11-16 16:31:02
还有pushdown不能共用maketag函数，应改为
```
void pushdown(int id) {
if(!a[id].laz) return;
a[lc].sum += (a[lc].r - a[lc].l + 1) * a[id].laz;
a[rc].sum += (a[rc].r - a[rc].l + 1) * a[id].laz;
a[lc].laz += a[id].laz;
a[rc].laz += a[id].laz;
a[id].laz = 0;
}
```
改完就过了
by MAZHIYUAN @ 2023-11-16 17:00:50