foo.cc: In function 'int main()':
foo.cc:5:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:8:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |         scanf("%d",&k);
      |         ~~~~~^~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务