/in/foo.cc: In function 'int main()':
/in/foo.cc:6:10: warning: unused variable 'H' [-Wunused-variable]
     char H,T;
          ^
/in/foo.cc:6:12: warning: unused variable 'T' [-Wunused-variable]
     char H,T;
            ^
/in/foo.cc:7:6: warning: unused variable 'm' [-Wunused-variable]
  int m,n;
      ^
/in/foo.cc:7:8: warning: unused variable 'n' [-Wunused-variable]
  int m,n;
        ^