```cpp t[p*2+1].pre=t[p].add*(t[p*2+1].r-t[p*2+1].l+1); ``` 这个地方=要改成+= by njz1234 @ 2024-02-09 00:40:10
@[njz1234](/user/370102) 感谢大佬 by yehuadonghui @ 2024-02-16 00:46:19