/in/foo.cc: In function 'int main()':
/in/foo.cc:15:44: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'float*' [-Wformat=]
  for (i=0;i<n;i++) scanf("%d%d",&x[i],&y[i]);
                                            ^
/in/foo.cc:15:44: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'float*' [-Wformat=]