using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Введите строку 1:");

        string str1 = Console.ReadLine();

        char[] cArr = str1.ToCharArray();

        Console.WriteLine("Введите строку 2:");

        string str2 = Console.ReadLine();

        char[] cArr2 = str2.ToCharArray();

        bool isContain = true;

        if (cArr.Length >= cArr2.Length)

        {

            int currentIndex = 0;

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

            {

                if (currentIndex == cArr2.Length) break;

                Console.WriteLine("cArr[" + i + "] = " + cArr[i] +", cArr2[" + currentIndex +"] =" + cArr2[currentIndex]);

                if (cArr[i] != cArr2[currentIndex])

                {

                    isContain = false;

                    currentIndex = 0;

                }

                else

                {

                    currentIndex++;

                    isContain = true;

                }

            }

        }

        else

            isContain = false;

        if (isContain)

            Console.WriteLine("Строка 1 содержит строку 2");

        else

            Console.WriteLine("Строка 1 не содержит строку 2");

    }

}