剑指offer 复杂链表的复制 (有向图的复制)

时间复杂度O(3N)


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
/*
struct RandomListNode {
    int label;
    struct RandomListNode *next, *random;
    RandomListNode(int x) :
            label(x), next(NULL), random(NULL) {
    }
};
*/
class Solution {
public:
    RandomListNode* Clone(RandomListNode* pHead)
    {
        if(!pHead)return NULL;
        RandomListNode *result,*cur,*tmp;
        cur=pHead;
        while(cur)//每个节点 后面复制一个自己
        {
            tmp=new RandomListNode(cur->label);
            tmp->next=cur->next;
            cur->next=tmp;
            cur=tmp->next;
        }
        cur=pHead;
        tmp=cur->next;
        while(cur)//复制random连接
        {
            if(cur->random!=NULL)
                tmp->random=cur->random->next;
            cur=tmp->next;
            if(cur!=NULL)//链表尾部的处理
                tmp=cur->next;
        }
        //拆分两个表
        cur=pHead;
        result=cur->next;
        tmp=result;
        while(cur)
        {
            cur->next=tmp->next;
            cur=cur->next;
            if(cur!=NULL)//链表尾部的处理
            {
                tmp->next=cur->next;
                tmp=tmp->next;
            }
        }
        return result;
    }
};

posted @ 2016-03-16 21:02  copperface  阅读(296)  评论(0编辑  收藏  举报