/in/foo.cc: In function 'int main()':
/in/foo.cc:21:10: warning: unused variable 'l' [-Wunused-variable]
  int T,n,l,r,Ans;
          ^
/in/foo.cc:21:12: warning: unused variable 'r' [-Wunused-variable]
  int T,n,l,r,Ans;
            ^
/in/foo.cc:21:14: warning: unused variable 'Ans' [-Wunused-variable]
  int T,n,l,r,Ans;
              ^~~