复杂链表的复制

题目描述
输入一个复杂链表(每个节点中有节点值,以及两个指针,一个指向下一个节点,另一个特殊指针指向任意一个节点),返回结果为复制后复杂链表的head。(注意,输出结果中请不要返回参数中的节点引用,否则判题程序会直接返回空)

解题思路
复杂链表的复制

public class RandomListNode{
		int label;
		RandomListNode next = null;
		RandomListNode random = null;
		RandomListNode(int label){
			this.label = label;
		}
	}
	
	public RandomListNode clone(RandomListNode pHead){
		if(pHead == null)
			return null;
		//复制节点 A->B->C 变成 A->A'->B->B'->C->C'
		RandomListNode head = pHead;
		while(head != null){
			RandomListNode node = new RandomListNode(head.label);
			node.next = head.next;
			head.next = node;
			head = node.next;
		}
		//复制random
		head = pHead;
		while(head != null){
			head.next.random = head.random == null ? null : head.random.next;
			head = head.next.next;
		}
		//折分
		head = pHead;
		RandomListNode chead = head.next;
		while(head != null){
			RandomListNode node = head.next;
			head.next = node.next;
			node.next = node.next == null ? null : node.next.next;
			head = head.next;
		}
		return chead;
	}

参考尾尾部落