/in/foo.cc: In function 'int main()':
/in/foo.cc:23:6: warning: variable 'l' set but not used [-Wunused-but-set-variable]
  int l,r,d,t;
      ^
/in/foo.cc:23:10: warning: unused variable 'd' [-Wunused-variable]
  int l,r,d,t;
          ^
/in/foo.cc:23:12: warning: unused variable 't' [-Wunused-variable]
  int l,r,d,t;
            ^