/in/foo.cc: In function 'int main()':
/in/foo.cc:21:53: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'double*' [-Wformat=]
  for(int i=1;i<=n;i++) scanf("%d %d",&e[i].x,&e[i].y);
                                                     ^
/in/foo.cc:21:53: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'double*' [-Wformat=]
/in/foo.cc:28:22: warning: format '%Lf' expects argument of type 'long double', but argument 2 has type 'double' [-Wformat=]
  printf("%.3Lf ",maxn);
                      ^