foo.cc: In function 'int main()':
foo.cc:43:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |  scanf("%d%d%d%d",&m,&n,&k,&d);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |  scanf("%s",s);
      |  ~~~~~^~~~~~~~

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