#include <iostream>
#include <algorithm>
#include <vector>
#include <iterator>
#include <numeric>
#include <fstream>

struct Point
{
    int x;
    int y;
};

std::istream& operator>>(std::istream& is, Point& p)
{
    return is >> p.x >> p.y;
}

int main()
{
    std::ifstream ifs {"points.txt"};
    std::vector<Point> points {std::istream_iterator<Point>{ifs},
                               std::istream_iterator<Point>{}};

    Point start {};

    std::cout << "Mata in en punkt: ";
    std::cin >> start;
    
    std::vector<int> distances {};
    std::transform(points.begin(), points.end(), std::back_inserter(distances),
                   [&start](Point const& p)
                   {
                       return std::abs(p.x - start.x) + std::abs(p.y - start.y);
                   });

    double sum {std::accumulate(distances.begin(), distances.end(), 0.0)};

    std::cout << "Medellängden från din punkt är: " << sum / distances.size() << std::endl;
    return 0;
}