Runtime Error
/in/foo.cc: In function 'int main()':
/in/foo.cc:27:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'node' [-Wformat=]
   printf("%d ",a[i]);
                    ^
  /in/foo.cc: In function 'int main()':
/in/foo.cc:27:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'node' [-Wformat=]
   printf("%d ",a[i]);
                    ^