75 lines
2.3 KiB
Java
75 lines
2.3 KiB
Java
# 35. 复杂链表的复制
|
||
|
||
[NowCoder](https://www.nowcoder.com/practice/f836b2c43afc4b35ad6adc41ec941dba?tpId=13&tqId=11178&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
|
||
|
||
## 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。
|
||
|
||
```java
|
||
public class RandomListNode {
|
||
int label;
|
||
RandomListNode next = null;
|
||
RandomListNode random = null;
|
||
|
||
RandomListNode(int label) {
|
||
this.label = label;
|
||
}
|
||
}
|
||
```
|
||
|
||
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/66a01953-5303-43b1-8646-0c77b825e980.png" width="300"/> </div><br>
|
||
|
||
## 解题思路
|
||
|
||
第一步，在每个节点的后面插入复制的节点。
|
||
|
||
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/dfd5d3f8-673c-486b-8ecf-d2082107b67b.png" width="600"/> </div><br>
|
||
|
||
第二步，对复制节点的 random 链接进行赋值。
|
||
|
||
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/cafbfeb8-7dfe-4c0a-a3c9-750eeb824068.png" width="600"/> </div><br>
|
||
|
||
第三步，拆分。
|
||
|
||
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/e151b5df-5390-4365-b66e-b130cd253c12.png" width="600"/> </div><br>
|
||
|
||
```java
|
||
public RandomListNode Clone(RandomListNode pHead) {
|
||
if (pHead == null)
|
||
return null;
|
||
// 插入新节点
|
||
RandomListNode cur = pHead;
|
||
while (cur != null) {
|
||
RandomListNode clone = new RandomListNode(cur.label);
|
||
clone.next = cur.next;
|
||
cur.next = clone;
|
||
cur = clone.next;
|
||
}
|
||
// 建立 random 链接
|
||
cur = pHead;
|
||
while (cur != null) {
|
||
RandomListNode clone = cur.next;
|
||
if (cur.random != null)
|
||
clone.random = cur.random.next;
|
||
cur = clone.next;
|
||
}
|
||
// 拆分
|
||
cur = pHead;
|
||
RandomListNode pCloneHead = pHead.next;
|
||
while (cur.next != null) {
|
||
RandomListNode next = cur.next;
|
||
cur.next = next.next;
|
||
cur = next;
|
||
}
|
||
return pCloneHead;
|
||
}
|
||
```
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div align="center"><img width="320px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/githubio/公众号二维码-2.png"></img></div>
|