给定一个链表，每个节点包含一个额外增加的随机指针，该指针可以指向链表中的任何节点或空节点。
要求返回这个链表的深度拷贝。
/** * Definition for singly-linked list with a random pointer. * struct RandomListNode { * int label; * RandomListNode *next, *random; * RandomListNode(int x) : label(x), next(NULL), random(NULL) {} * }; */ class Solution { public: RandomListNode *copyRandomList(RandomListNode *head) { if (!head) return NULL; RandomListNode *cur = head; while (cur) { RandomListNode *node = new RandomListNode(cur->label); node->next = cur->next; cur->next = node; cur = node->next; } cur = head; while (cur) { if (cur->random) { cur->next->random = cur->random->next; } cur = cur->next->next; } cur = head; RandomListNode *res = head->next; while (cur) { RandomListNode *tmp = cur->next; cur->next = tmp->next; if(tmp->next) tmp->next = tmp->next->next; cur = cur->next; } return res; } };
