/in/foo.cc: In function 'int main()':
/in/foo.cc:19:53: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'float*' [-Wformat=]
  for(int i=1;i<=n;i++) scanf("%d %d",&e[i].x,&e[i].y);
                                                     ^
/in/foo.cc:19:53: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'float*' [-Wformat=]