@[YBaggio](/user/507534)
你这个地方对应的是欧拉序的节点吧,怎么就看不到欧拉序相关的东西呢?
```cpp
while (l < q[i].l) modify (l++);
while (l > q[i].l) modify (--l);
while (r < q[i].r) modify (++r);
while (r > q[i].r) modify (r--);
```
by Phigros_Light @ 2023-07-20 20:17:27
@[Phigros_Light](/user/356001) 嗯,谢谢,已A
by YBaggio @ 2023-07-20 21:11:08