using System;

​

public class Program

{

    public static void Main()

    {

        PairOfNums[] pairs = PairOfNums.Generate(5);

​

        for (int i = 0; i < pairs.Length; i++)

        {

            PairOfNums pair = pairs[i];

            Console.WriteLine("Pair " + (i + 1) + ": (" + pair.GetNum1() + ", " + pair.GetNum2() + ")");

            Console.WriteLine("Is End-Start Pair: " + pair.IsEndStartPair());

        }

    }

}

​

public class PairOfNums

{

    private int num1;

    private int num2;

​

    public PairOfNums(int num1, int num2)

    {

        this.num1 = num1;

        this.num2 = num2;

    }

​

    public bool IsEndStartPair()

    {

        int lastDigitNum1 = num1 % 10;

        int firstDigitNum2 = GetFirstDigit(num2);

        int lastDigitNum2 = num2 % 10;

        int firstDigitNum1 = GetFirstDigit(num1);

​

        return (firstDigitNum1 == lastDigitNum2) || (firstDigitNum2 == lastDigitNum1);

    }

​

    private int GetFirstDigit(int number)

    {

        while (number >= 10)

        {

            number /= 10;

        }

        return number;

    }

​

    public int GetNum1()

    {

        return num1;

    }

​

    public int GetNum2()

    {

        return num2;

    }

​

    public static PairOfNums[] Generate(int n)

    {

        PairOfNums[] pairs = new PairOfNums[n];

        Random random = new Random();

​

        for (int i = 0; i < n; i++)

        {

            int generatedNum1 = 0;

            int generatedNum2 = 0; 

            bool isEndStartPair = false;

​

            while (!isEndStartPair)

            {

                generatedNum1 = random.Next(1, 1001);

                generatedNum2 = random.Next(1, 1001);

​

                int lastDigitNum1 = generatedNum1 % 10;

                int firstDigitNum2 = generatedNum2;

                while (firstDigitNum2 >= 10)

                {

                    firstDigitNum2 /= 10;

                }

​

                int lastDigitNum2 = generatedNum2 % 10;

                int firstDigitNum1 = generatedNum1;

                while (firstDigitNum1 >= 10)

                {

                    firstDigitNum1 /= 10;

                }

​

                if ((firstDigitNum1 == lastDigitNum2) || (firstDigitNum2 == lastDigitNum1))

                {

                    isEndStartPair = true;

                }

            }

​

            pairs[i] = new PairOfNums(generatedNum1, generatedNum2);

        }

​

        return pairs;

    }

}