题目：输入一个单向链表，输出该链表中倒数第k个结点。链表的倒数第0个结点为链表的尾指针。...

题目：输入一个单向链表，输出该链表中倒数第k个结点。链表的倒数第0个结点为链表的尾指针。
链表结点定义如下：
struct ListNode
{
int m_nKey;
ListNode* m_pNext;
};

C# codes as below:

using System;

using System.Collections.Generic;

namespace ConsoleApp

{

class RunClass

{

static void Main()

{

Node<int> i1 = new Node<int>() { Value = 4 };

Node<int> i2 = new Node<int>() { Value = 8, Next = i1 };

Node<int> i3 = new Node<int>() { Value = 12, Next = i2 };

Node<int> i4 = new Node<int>() { Value = 16, Next = i3 };

Link<int> link = new Link<int>() { Start = i4 };

Node<int> i = new Helper().GetNode<int>(link, 1);

Console.WriteLine(i.Value);

Console.ReadLine();

}

}

class Helper

{

public Node<T> GetNode<T>(Link<T> link, int index)

{

Node<T> current = link.Start;

Stack<Node<T>> stack = new Stack<Node<T>>();

stack.Push(current);

while (current.Next != null)

{

current = current.Next;

stack.Push(current);

}

if (stack.Count < index + 1 || index < 0)

return null;

else

{

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

{

stack.Pop();

}

return stack.Pop();

}

}

}

class Link<T>

{

public Node<T> Start { get; set; }

}

class Node<T>

{

public Node<T> Next { get; set; }

public T Value { get; set; }

}

}