using System;

​

public class Node

{

    public Node Next { get; set; }

    public int Value { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var n13 = new Node() { Value = 13 };

        var n12 = new Node() { Next = n13, Value = 12 };

        var n11 = new Node() { Next = n12, Value = 11 };

        var n10 = new Node() { Next = n11, Value = 10 };

        var n9 = new Node() { Next = n10, Value = 9 };

        var n8 = new Node() { Next = n9, Value = 8 };

        var n7 = new Node() { Next = n8, Value = 7 };

        var n6 = new Node() { Next = n7, Value = 6 };

        var n5 = new Node() { Next = n6, Value = 5 };

        var n4 = new Node() { Next = n5, Value = 4 };

        var n3 = new Node() { Next = n4, Value = 3 };

        var n2 = new Node() { Next = n3, Value = 2 };

        var n1 = new Node() { Next = n2, Value = 1 };

        var n0 = new Node() { Next = n1, Value = 0 };

​

        n13.Next = n1;

​

        if (CheckStackoverflow2(n0) == true)

        {

            Console.WriteLine("stack overflow detected!!!");

        }

        else {

            Console.WriteLine("stack overflow hasn't detected");

        }

    }

    public static bool CheckStackoverflow2(Node linkedList)

    {

        if (linkedList == null)

        {

            return false;

        }

​

        Node nextNode = linkedList;

​

        while (true)

        {

            if (linkedList == nextNode)

            {

                return true;

            }

​

            if (nextNode == null)

            {

                return false;

            }

            nextNode = nextNode.Next;

        }

​

        return false;

    }

}