```cpp
int tmp_1=ne[posa],t=ne[posc];
ne[posa]=ne[posb];
ne[posc]=tmp_1;
ne[posb]=t;
```
二者只在这一部分有区别```cpp
int tmp_1=ne[posa],t=ne[posc];
ne[posa]=ne[posb];
ne[posb]=ne[posc];
ne[posc]=tmp_1;
```
by 2233颗GoldenEgg @ 2022-10-27 23:26:43