foo.cc: In function 'int main()':
foo.cc:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |     scanf("%d%d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~
foo.cc:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |         scanf(" %c",&c);
      |         ~~~~~^~~~~~~~~~
foo.cc:23:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |             scanf("%d",&m);
      |             ~~~~~^~~~~~~~~
foo.cc:31:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |             scanf("%d%d",&m,&p);
      |             ~~~~~^~~~~~~~~~~~~~
foo.cc:38:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |             scanf("%d%d",&m,&p);
      |             ~~~~~^~~~~~~~~~~~~~

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