题目:
复杂链表的复制
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)
解题:
/*
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 == NULL) return NULL;
RandomListNode *head = pHead;
while(head){
RandomListNode *node = new RandomListNode(head->label);
node->next = head->next;
head->next = node;
head = node;
}
head = pHead;
while(head){
RandomListNode *node = head->next;
if(head->random){
// random->next
node->random = head->random->next;
}
head = node->next;
}
RandomListNode *root = pHead->next;
head = pHead;
RandomListNode *tmp;
while(head->next){
tmp = head->next;
head->next = tmp->next;
head = tmp;
}
return root;
}
};