foo.cc: In function 'int main()':
foo.cc:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |     scanf("%d",&k);
      |     ~~~~~^~~~~~~~~
foo.cc:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |         scanf("%d\n%d\n",&n,&who);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~
foo.cc:27:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |             scanf("%d",&a);
      |             ~~~~~^~~~~~~~~

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