/in/foo.cc: In function 'int main()':
/in/foo.cc:22:10: warning: unused variable 'j' [-Wunused-variable]
  int n,i,j,u,v,mineid,minv;
          ^
/in/foo.cc:22:12: warning: unused variable 'u' [-Wunused-variable]
  int n,i,j,u,v,mineid,minv;
            ^
/in/foo.cc:22:14: warning: unused variable 'v' [-Wunused-variable]
  int n,i,j,u,v,mineid,minv;
              ^
/in/foo.cc:22:16: warning: variable 'mineid' set but not used [-Wunused-but-set-variable]
  int n,i,j,u,v,mineid,minv;
                ^~~~~~
/in/foo.cc:22:23: warning: variable 'minv' set but not used [-Wunused-but-set-variable]
  int n,i,j,u,v,mineid,minv;
                       ^~~~