/in/foo.cc: In function 'int main()':
/in/foo.cc:25:23: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",node[i].r);
                       ^
/in/foo.cc:22:6: warning: unused variable 'ans' [-Wunused-variable]
  int ans,root=1;
      ^