/in/foo.cc: In function 'int main()':
/in/foo.cc:92:87: warning: format '%d' expects argument of type 'int', but argument 5 has type 'long long int' [-Wformat=]
   printf("i == %d l == %d r == %d data == %d\n", i, node[i].l, node[i].r, node[i].data);
                                                                                       ^