import java.util.HashMap;/*** @author god-jiang* @date 2020/1/16  18:48*/
public class RandomListNodeCopy {//定义复杂链表的结构public class RandomListNode {int label;RandomListNode next = null;RandomListNode random = null;RandomListNode(int label) {this.label = label;}}public RandomListNode Clone(RandomListNode pHead) {HashMap<RandomListNode, RandomListNode> map = new HashMap<>();RandomListNode cur = pHead;while (cur != null) {map.put(cur, new RandomListNode(cur.label));cur = cur.next;}cur = pHead;while (cur != null) {map.get(cur).next = map.get(cur.next);map.get(cur).random = map.get(cur.random);cur = cur.next;}return map.get(pHead);}
}

import java.util.HashMap;/*** @author god-jiang* @date 2020/1/16  18:48*/
public class RandomListNodeCopy {//定义复杂链表的结构public class RandomListNode {int label;RandomListNode next = null;RandomListNode random = null;RandomListNode(int label) {this.label = label;}}//合并拆分的时间复杂度为O(N)，空间复杂度为O(1)public RandomListNode Clone(RandomListNode pHead) {if (pHead == null) {return null;}RandomListNode cur = pHead;//1、复制每个结点，如复制结点A得到A1，将结点A1插到结点A后面；while (cur != null) {RandomListNode cloneNode = new RandomListNode(cur.label);RandomListNode nextNode = cur.next;cur.next = cloneNode;cloneNode.next = nextNode;cur = nextNode;}cur = pHead;//2、重新遍历链表，复制老结点的随机指针给新结点，如A1.random = A.random.next;while (cur != null) {cur.next.random = cur.random == null ? null : cur.random.next;cur = cur.next.next;}//3、拆分链表，将链表拆分为原链表和复制后的链表cur = pHead;RandomListNode pCloneHead = pHead.next;while (cur != null) {RandomListNode cloneNode = cur.next;cur.next = cloneNode.next;cloneNode.next = cloneNode.next == null ? null : cloneNode.next.next;cur = cur.next;}return pCloneHead;}
}