foo.cc: In function 'int main()':
foo.cc:29:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
foo.cc:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:32:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf",&a[i]);
   ~~~~~^~~~~~~~~~~~~
foo.cc:57:51: warning: 'ansy' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d\n%d\n",(int)floor(ansx+0.5),(int)floor(ansy+0.5));
                                              ~~~~~^~~~~~~~~~
foo.cc:57:30: warning: 'ansx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d\n%d\n",(int)floor(ansx+0.5),(int)floor(ansy+0.5));
                         ~~~~~^~~~~~~~~~

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