我也这么写的，然后也寄了，所以 Cu Ball
by ACaCaca_ @ 2023-01-30 12:27:40
```cpp
if (cnt) ans = (ll)size * (2 * n + 1 - x) + (ll)(n - size) * (2 * n + 1);
```
↓
```cpp
if (cnt) ans = (ll)size * (2 * n + 1 - x);
```
by andyli @ 2023-01-30 12:36:11
以及 e 数组没开 2 倍
by andyli @ 2023-01-30 12:37:14
@[andyli](/user/84282) 谢谢巨佬，我是sb（
by Register_int_Offical @ 2023-01-30 12:39:37
@[Register_int_Offical](/user/743447) dfs2 前两行交换一下，否则可能溢出
by andyli @ 2023-01-30 12:43:52
@[andyli](/user/84282) 谢谢！！！！
by Register_int_Offical @ 2023-01-30 12:47:39