```cpp
priority_queue< pair<int,int> ,vector< pair<int,int> >,less< pair<int,int> > > q;
```
错了，是
```cpp
priority_queue< pair<int,int> ,vector< pair<int,int> >,greater< pair<int,int> > > q;
```
by Glassy_Sky @ 2023-11-05 16:13:26