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