Andy Back-end Dev Engineer

剑指offer-复杂链表的复制

2018-07-11

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)

解体思路

1.在每个结点的后面插入复制的结点 2.对复制结点的random链接进行赋值 3.拆分

代码实现:

/*
public class RandomListNode {
    int label;
    RandomListNode next = null;
    RandomListNode random = null;

    RandomListNode(int label) {
        this.label = label;
    }
}
*/
public class Solution {
    public RandomListNode Clone(RandomListNode pHead)
    {
        if(pHead == null)
            return null;
        
        // 插入新节点
        RandomListNode current = pHead;
        while(current != null) {
            RandomListNode clone = new RandomListNode(current.label);
            clone.next = current.next;
            current.next = clone;
            current = clone.next;
        }
        
        // 建立Random链接
        current = pHead;
        while(current != null) {
            RandomListNode clone = current.next;
            if(current.random != null) 
                clone.random = current.random.next;
            current = clone.next;
        }
        
        // 拆分
        current = pHead;
        RandomListNode pCloneHead = pHead.next;
        while(current.next != null) {
            RandomListNode next = current.next;
            current.next = next.next;
            current = next;
        }
        
        return pCloneHead;
    }
}

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