foo.cc: In function 'int main()':
foo.cc:51:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |  scanf("%d%d",&m,&n);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:54:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |   scanf("%d%d%d",&xx,&yy,&zz);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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