/in/foo.cc: In function 'void dijkstra1(int)':
/in/foo.cc:60:7: warning: unused variable 'dis' [-Wunused-variable]
   int dis=q.top().dis;
       ^~~
/in/foo.cc: In function 'void dijkstra2(int)':
/in/foo.cc:99:7: warning: unused variable 'dis' [-Wunused-variable]
   int dis=q.top().dis;
       ^~~