```cpp
if(mid <= L){
ans += query(left_node, start, mid, L, R);
} else if(mid > R){
ans += query(right_node, mid + 1, end, L, R);
}
```
改成
```cpp
if(L <= mid){
ans += query(left_node, start, mid, L, R);
} if(mid < R){
ans += query(right_node, mid + 1, end, L, R);
}
```
by ningago @ 2022-05-06 22:56:02
@[yzy001633](/user/519573)
by ningago @ 2022-05-06 22:56:37
@[ningago](/user/371968) 蟹蟹大佬
by Daniel_yao @ 2022-05-06 22:58:13