foo.cc: In function 'int main()':
foo.cc:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |   scanf("%d%d",&n,&k);
      |   ~~~~~^~~~~~~~~~~~~~
foo.cc:17:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |    scanf("%s%d",&c,&m);
      |    ~~~~~^~~~~~~~~~~~~~
foo.cc:20:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |     scanf("%d",&p);
      |     ~~~~~^~~~~~~~~

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