foo.cc: In function 'int printNode(int)':
foo.cc:61:1: warning: no return statement in function returning non-void [-Wreturn-type]
   61 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:67:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   67 |         scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务