foo.cc: In function 'int main()':
foo.cc:8:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 | scanf("%d%d",&n,&m);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |   scanf("%d%d",&b,&y);
      |   ~~~~~^~~~~~~~~~~~~~

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