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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Projection_traits_xy_3.h>
#include <CGAL/Delaunay_triangulation_2.h>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Projection_traits_xy_3<K> Gt;
typedef CGAL::Delaunay_triangulation_2<Gt> Delaunay;
typedef K::Point_3 Point;
int main()
{
std::ifstream in("data/terrain.cin");
std::istream_iterator<Point> begin(in);
std::istream_iterator<Point> end;
Delaunay dt(begin, end);
std::cout << dt.number_of_vertices() << std::endl;
return 0;
}
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