本题源自LeetCode
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1 先复制节点,让复制节点插入节点的后面。
2 调整随机指针,复制节点的随机指针指向节点随机指针的下一个节点
3 将链表拆分开
RandomListNode *copyRandomList(RandomListNode *head) {
cloneListNode(head);
cloneRandom(head);
return reconnectNodes(head);
}
//复制节点,在节点的后面
void cloneListNode(RandomListNode *head){
RandomListNode *p=head;
while(p!=NULL){
RandomListNode *cloneNode=new RandomListNode(p->label);
cloneNode->next=p->next;
cloneNode->random=NULL;
p->next=cloneNode;
p=cloneNode->next;
}
}
//复制随机指针
void cloneRandom(RandomListNode *head){
RandomListNode *p=head;
while(p!=NULL){
RandomListNode *cloneNode=p->next;
if(p->random!=NULL)
cloneNode->random=p->random->next;
p=cloneNode->next;
}
}
//拆分链表
RandomListNode* reconnectNodes(RandomListNode* head){
if(head == NULL)
return NULL;
RandomListNode* p=head;
RandomListNode *cloneHead=p->next;
RandomListNode *cloneNode=cloneHead;
p->next=cloneNode->next;
p=p->next;
while(p!=NULL){
cloneNode->next=p->next;
cloneNode=cloneNode->next;
p->next=cloneNode->next;
p=p->next;
}
return cloneHead;
}