/in/foo.cc: In function 'int main()':
/in/foo.cc:10:7: error: 's' was not declared in this scope
  cin>>s>>T;
       ^
/in/foo.cc: In function 'int bfs()':
/in/foo.cc:17:7: error: 's' was not declared in this scope
  dist[s]=0;
       ^