foo.cc: In function 'int main()':
foo.cc:29:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 | scanf("%d%d",&n,&m);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:33:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 | scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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