using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var source1 = new int[]{1, 34, 3, 98, 9, 76, 45, 4};

        var source2 = new int[]{54, 546, 548, 60};

        var largest1 = LargestPossibleSequence(source1);

        var largest2 = LargestPossibleSequence(source2);

        Console.WriteLine("The largest possible integer from set 1 is: {0}", largest1);

        Console.WriteLine("The largest possible integer from set 2 is: {0}", largest2);

    }

​

    static long LargestPossibleSequence(int[] ints)

    {

         return long.Parse(string.Join("", ints.OrderBy(i => i, new IntConcatenationComparer()).Reverse()));

    }

}

​

class IntConcatenationComparer : IComparer<int>

{

    public int Compare(int x, int y)

    {

        var xy = int.Parse(x.ToString() + y.ToString());

        var yx = int.Parse(y.ToString() + x.ToString());

        return xy - yx;

    }

}