foo.cc: In function 'int main()':
foo.cc:26:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&r,&a,&t);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:27:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=1;i<=a;i++) scanf("%lf %lf",&door[i].x,&door[i].y);
                         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf %lf %lf",&sx,&sy,&v);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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