Defibrillator.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            string LON = Console.ReadLine().Replace(',', '.');
            string LAT = Console.ReadLine().Replace(',', '.');
            double lon = double.Parse(LON);
            double lat = double.Parse(LAT);
            int N = int.Parse(Console.ReadLine());

            string closest = "";
            double minDist = double.MaxValue;
            for (int i = 0; i < N; i++)
            {
                string DEFIB = Console.ReadLine();
                double lon2 = getLon(DEFIB);
                double lat2 = getLat(DEFIB);

                if (dist(lon, lat, lon2, lat2) < minDist)
                {
                    minDist = dist(lon, lat, lon2, lat2);
                    closest = getName(DEFIB);
                }
            }

            Console.WriteLine(closest);
        }

        static double dist(double lonA, double latA, double lonB, double latB)
        {
            return (double)Math.Sqrt((double)Math.Pow((lonB - lonA)
                    * (double)Math.Cos((latA + latB) / 2.0D), 2)
                    + (double)Math.Pow(latB - latA, 2)) * 6371.0D;
        }


        static string getName(string s)
        {
            return s.Split(';')[1];
        }

        static double getLon(string s)
        {
            return double.Parse(s.Split(';')[4].Replace(',', '.'));
        }

        static double getLat(string s)
        {
            return double.Parse(s.Split(';')[5].Replace(',', '.'));
        }
    }
}