题目:
![](https://img-blog.csdnimg.cn/direct/aa4888e56b754e54933fe2157345147b.png)
题解:
cpp
struct ListNode* reverseList(struct ListNode* head) {
if (head == NULL || head->next == NULL) {
return head;
}
struct ListNode* newHead = reverseList(head->next);
head->next->next = head;
head->next = NULL;
return newHead;
}