更新到某节点最短路的操作应该在判断此节点是否在队内之外
by Francais_Drake @ 2021-11-14 20:18:21
`opt==1`的时候边加反了应改为
```c++
add(a, b, -c)
```
by wcyQwQ @ 2022-03-24 15:53:47
您freopen没删
by YBaggio @ 2022-08-20 16:48:43