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复杂链表的复制 #46

Open guanpengchn opened 5 years ago

guanpengchn commented 5 years ago

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)

/*
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* pNew = pHead;
        while(pNew){
            RandomListNode* tmp = new RandomListNode(pNew->label);
            tmp->next = pNew->next;
            pNew->next = tmp;
            pNew = pNew->next->next;
        }
        pNew = pHead;
        while(pNew){
            if(pNew->random){
                pNew->next->random = pNew->random->next;
            }
            pNew = pNew->next->next;
        }
        RandomListNode* pResult = pHead->next;
        pNew = pHead->next;
        while(pNew){
            pHead->next = pNew->next;
            if(pNew->next){
                pNew->next = pNew->next->next;
            }
            pHead = pHead->next;
            pNew = pNew->next;
        }
        return pResult;
    }
};