using System;

using System.Linq;

using System.Collections.Generic;

​

public class ZoneInfo

{

    public int Cost { get; set; }

    public string Name { get; set; }

    public int Radius { get; set; }

}

​

public class Program

{   

    public static void Main(string[] args)

    {

        List<int> ranges = new() { 4, 20, 21 };

        List<ZoneInfo> zones = new();

        zones.Add(new ZoneInfo

            {Cost = 25, Name = "Zone 1", Radius = 5});

        zones.Add(new ZoneInfo

            {Cost = 40, Name = "Zone 2", Radius = 10});

        zones.Add(new ZoneInfo

            {Cost = 60, Name = "Zone 3", Radius = 20});

        foreach (var range in ranges)

        {

            var idealZone = GetIdealZoneOrNull(zones, range);

            if (idealZone != null)

            {

                Console.WriteLine($"To travel {range} miles, you should select zone {idealZone.Name}. It has a range of {idealZone.Radius} miles and costs ${idealZone.Cost}");

            }

            else

            {

                Console.WriteLine($"No zone covers your desired range of {range} miles");

            }   

        }

    }

    public static ZoneInfo GetIdealZoneOrNull(IEnumerable<ZoneInfo> zones, int rangeToCover)

    {

        return zones

            .Where(zone => zone.Radius >= rangeToCover)

            .MinBy(zone => zone.Cost);

    }

}

​