吐了，改了一下10分
by gghack_Nythix @ 2023-08-24 14:04:40
又调了一下，只剩re了20分
by gghack_Nythix @ 2023-08-24 14:06:32
过了，死因``` r <= mid,l > mid```和
```cpp
if(x == 1)ax = querysum(1,1,1);
if(x == 2)ax = querysum(1,1,2) - (querysum(1,1,1) << 1);
else ax = querysum(1,1,x) + querysum(1,1,x - 2) - (querysum(1,1,x - 1) << 1);
```
写成
```cpp
if(x == 1)ax = querysum(1,1,1);
else if(x == 2)ax = querysum(1,1,2) - (querysum(1,1,1) << 1);
else ax = querysum(1,1,x) + querysum(1,1,x - 2) - (querysum(1,1,x - 1) << 1);
```
就不会re了
by gghack_Nythix @ 2023-08-24 14:19:24