public void Test()
{
RandomListNode node1 = new RandomListNode(1);
RandomListNode node2 = new RandomListNode(2);
RandomListNode node3 = new RandomListNode(3);
node1.next = node2;
node1.random = node3;
node2.next = node3;
node2.random = null;
node3.next = null;
node3.random = node1;
RandomListNode head = node1;
RandomListNode copy = CopyRandomList(head);
RandomListNode node = copy;
while (node != null)
{
Console.Write(node.label + " ");
if (node.random != null)
{
Console.Write(node.random.label);
}
Console.WriteLine();
node = node.next;
}
Console.ReadLine();
}
//给定一个链表，每个节点包含一个额外增加的随机指针，该指针可以指向链表中的任何节点或空节点。
//要求返回这个链表的深度拷贝。
public RandomListNode CopyRandomList(RandomListNode head)
{
RandomListNode node = head;
List <RandomListNode> list = new List <RandomListNode>();
while (node != null)
{
list.Add(node);
node = node.next;
}
RandomListNode copy = null;
RandomListNode last = null;
List <RandomListNode> copyList = new List <RandomListNode>(list.Count);
foreach (RandomListNode e in list)
{
RandomListNode newNode = new RandomListNode(e.label);
copyList.Add(newNode);
if (copy == null)
{
copy = newNode;
}
else
{
last.next = newNode;
}
last = newNode;
}
node = copy;
for (int i = 0; i < list.Count; i++)
{
if (list[i].random != null)
{
int randomIndex = list.IndexOf(list[i].random);
node.random = copyList[randomIndex];
}
node = node.next;
}
return(copy);
}
