已过,警示后人,每次跑spfa要清空vis
```cpp
int spfa(){
for(int i=1;i<=n;i++){
d[i]=INT_MAX;
vis[i]=0;
}
...
}
```
by rmzls @ 2023-08-22 14:12:53
不过我这样写按理来说也不用清(?),没搞懂
by rmzls @ 2023-08-22 14:14:10