/in/foo.cc: In function 'int main()':
/in/foo.cc:32:6: warning: unused variable 't' [-Wunused-variable]
  int t = 3;
      ^
/in/foo.cc: In function 'void dij()':
/in/foo.cc:19:12: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
   vis[cur] = true;
   ~~~~~~~~~^~~~~~