~~玄 学~~
by 紫陰花 @ 2019-11-12 13:00:20
后来改成void spfa
如下
```
spfa(0);
if(flag)
{
cout<<"-1";
return 0;
}
spfa(1);
if(dis[n]<-1000000000)
{
cout<<"-2";
return 0;
}
```
和
```
void spfa(int x)
```
就A了
?????????
by zyc123 @ 2019-11-12 13:01:13