/in/foo.cc: In function 'bool nb(int)':
/in/foo.cc:26:35: warning: pointer to a function used in arithmetic [-Wpointer-arith]
  if(nd[root].r>=0&&size[nd[root].l]<max(size[nd[nd[root].r].l],size[nd[nd[root].r].r])) return 1;
                                   ^
/in/foo.cc:26:62: warning: pointer to a function used in arithmetic [-Wpointer-arith]
  if(nd[root].r>=0&&size[nd[root].l]<max(size[nd[nd[root].r].l],size[nd[nd[root].r].r])) return 1;
                                                              ^
/in/foo.cc:26:85: warning: pointer to a function used in arithmetic [-Wpointer-arith]
  if(nd[root].r>=0&&size[nd[root].l]<max(size[nd[nd[root].r].l],size[nd[nd[root].r].r])) return 1;
                                                                                     ^