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程式語言 - LeetCode - C++ - 206. Reverse Linked List

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參考資訊：
https://www.cnblogs.com/cnoodle/p/11670754.html

題目：


解答：

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
    ListNode* reverseList(ListNode* head) {
        if (!head || !head->next) {
            return head;
        }

        ListNode *pre = nullptr;
        ListNode *cur = head;

        while (cur) {
            ListNode *next = cur->next;
            cur->next = pre;
            pre = cur;
            cur = next;
        }

        return pre;
    }
};