/in/foo.cc: In function 'int main()':
/in/foo.cc:24:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |     scanf("%d",&num);
      |     ~~~~~^~~~~~~~~~~
/in/foo.cc:27:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         scanf("%d",&k);
      |         ~~~~~^~~~~~~~~
/in/foo.cc:29:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |             scanf("%d",&n[j]);
      |             ~~~~~^~~~~~~~~~~~