/in/foo.cc: In function 'int main()':
/in/foo.cc:29:6: warning: unused variable 'c' [-Wunused-variable]
  int c[10001],d[10001],nc,nd;
      ^
/in/foo.cc:29:15: warning: unused variable 'd' [-Wunused-variable]
  int c[10001],d[10001],nc,nd;
               ^
/in/foo.cc:29:24: warning: unused variable 'nc' [-Wunused-variable]
  int c[10001],d[10001],nc,nd;
                        ^~
/in/foo.cc:29:27: warning: unused variable 'nd' [-Wunused-variable]
  int c[10001],d[10001],nc,nd;
                           ^~