foo.cc: In function 'int main()':
foo.cc:149:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:155:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d%d",&x,&y,&noa);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:158:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:161:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&m);
   ~~~~~^~~~~~~~~

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