// 第三步把这个长链表拆分成两个链表。
private static ComplexListNode ReconnectNodes(ComplexListNode head)
{
ComplexListNode node = head;
ComplexListNode clonedHead = null;
ComplexListNode clonedNode = null;
if (node != null)
{
clonedHead = clonedNode = node.Next;
node.Next = clonedNode.Next;
node = node.Next;
}
while (node != null)
{
// 复制链表的连接
clonedNode.Next = node.Next;
clonedNode = clonedNode.Next;
// 原始链表的连接
node.Next = clonedNode.Next;
node = node.Next;
}
return(clonedHead);
}
// 只有一个结点
public static void Test4()
{
ComplexListNode node1 = new ComplexListNode(1);
node1.Sibling = node1;
TestPortal("Test4", node1);
}
private static void BuildNodes(ComplexListNode node, ComplexListNode next, ComplexListNode sibling)
{
if (node != null)
{
node.Next = next;
node.Sibling = sibling;
}
}
// 第二步设置复制出来的结点的Sibling。
private static void ConnectSiblingNodes(ComplexListNode head)
{
ComplexListNode node = head;
while (node != null)
{
ComplexListNode cloned = node.Next;
if (node.Sibling != null)
{
cloned.Sibling = node.Sibling;
}
node = cloned.Next;
}
}
public static void TestPortal(string testName, ComplexListNode head)
{
if (!string.IsNullOrEmpty(testName))
{
Console.WriteLine("{0} begins:", testName);
}
Console.WriteLine("The original list is:");
PrintList(head);
ComplexListNode clonedHead = Clone(head);
Console.WriteLine("The cloned list is:");
PrintList(clonedHead);
}
// 第一步是根据原始链表的每个结点N创建对应的N'。
private static void CloneNodes(ComplexListNode head)
{
ComplexListNode node = head;
while (node != null)
{
ComplexListNode cloned = new ComplexListNode();
cloned.Data = node.Data;
cloned.Next = node.Next;
cloned.Sibling = null;
node.Next = cloned;
node = cloned.Next;
}
}
// Sibling形成环
// -----------------
// \|/ |
// 1-------2-------3-------4-------5
// | /|\
// | |
// |---------------|
public static void Test3()
{
ComplexListNode node1 = new ComplexListNode(1);
ComplexListNode node2 = new ComplexListNode(2);
ComplexListNode node3 = new ComplexListNode(3);
ComplexListNode node4 = new ComplexListNode(4);
ComplexListNode node5 = new ComplexListNode(5);
BuildNodes(node1, node2, null);
BuildNodes(node2, node3, node4);
BuildNodes(node3, node4, null);
BuildNodes(node4, node5, node2);
TestPortal("Test3", node1);
}
private static void PrintList(ComplexListNode head)
{
ComplexListNode node = head;
while (node != null)
{
Console.WriteLine("The value of this node is: {0}.", node.Data);
if (node.Sibling != null)
{
Console.WriteLine("The value of its sibling is: {0}.", node.Sibling.Data);
}
else
{
Console.WriteLine("This node does not have a sibling.");
}
Console.WriteLine();
node = node.Next;
}
}
public static ComplexListNode Clone(ComplexListNode head)
{
CloneNodes(head);
ConnectSiblingNodes(head);
return(ReconnectNodes(head));
}
public ComplexListNode(int data, ComplexListNode next, ComplexListNode sibling = null)
{
this.Data = data;
this.Next = next;
this.Sibling = sibling;
}