foo.cc: In function 'int main()':
foo.cc:5:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |      scanf("%d %d",&m,&n);
      |      ~~~~~^~~~~~~~~~~~~~~
foo.cc:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d",&i);
      |     ~~~~~^~~~~~~~~

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