using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public record T(int Distance, string First, string Second);

public static void Main()

{

    var rand = new Random();

    var nrs = new HashSet<string>();

    // maak 1_000 willekeurige nrs

    var range = Enumerable.Range(0, 500);

    foreach (var x in range)

    {

        var nr = rand.Next(0, 100000000);

        nrs.Add(nr.ToString("0600000000"));

    }

    var grouped = nrs

        .Select(x=>new {

            Number = x,

            Value = x.Skip(2).GroupBy(x => x).Sum(x => Math.Pow(2, x.Count()))

        })

        .OrderByDescending(x=>x.Value)

        .Take(15);

    Console.WriteLine("Veel dezelfde nummers");

    Console.WriteLine(String.Join("\n", grouped.Select(x=>x.Number).OrderBy(x=>x)));

    Console.WriteLine();

    var list1 = nrs.OrderBy(x=>x).ToList();

    var list2 = list1.Skip(1).ToList();

    var zipped = list1.Zip(list2, (first, second) =>

    {

        return new

        {

            First = first,

            Second = second,

            Diff = Int32.Parse(second) - Int32.Parse(first),

        };

    }).ToList();

    var top = zipped.OrderBy(x=>x.Diff).Take(20).ToList();

    Console.WriteLine("Dicht bij elkaar numeriek");

    Console.WriteLine(String.Join("\n", top.Select(x=>x.First).ToHashSet().Union(top.Select(x=>x.Second)).OrderBy(x=>x).Take(15) ));

    Console.WriteLine();

​

​

​

​

    var dict = new HashSet<T>();

    var query = nrs.SelectMany(x => nrs, (x, y) => new { x, y });

    foreach (var item in query)

    {

        if (item.x == item.y)

            continue;

        var distance = Fastenshtein.Levenshtein.Distance(item.x, item.y);

        if (item.x.CompareTo(item.y) < 0)

        {

            dict.Add(new T(distance, item.x, item.y));

        }

        else

        {

            dict.Add(new T(distance, item.y, item.x));

        }

    }

    var close = dict.OrderBy(x=>x.Distance).Take(20).ToList();

        Console.WriteLine("Lijken op elkaar");

        Console.WriteLine(String.Join("\n", close.Select(x=>$"{x.First}: {x.Second}")));

        Console.WriteLine();

}

​

// You can define other methods, fields, classes and namespaces here

​

}