|
| 1 | + |
| 2 | +>仰望星空的人,不应该被嘲笑 |
| 3 | + |
| 4 | +## 题目描述 |
| 5 | + |
| 6 | +反转一个单链表。 |
| 7 | + |
| 8 | +示例: |
| 9 | + |
| 10 | +```javascript |
| 11 | +输入: 1->2->3->4->5->NULL |
| 12 | +输出: 5->4->3->2->1->NULL |
| 13 | +``` |
| 14 | + |
| 15 | +进阶: |
| 16 | +你可以迭代或递归地反转链表。你能否用两种方法解决这道题? |
| 17 | + |
| 18 | +来源:力扣(LeetCode) |
| 19 | +链接:https://leetcode-cn.com/problems/reverse-linked-list |
| 20 | +著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。 |
| 21 | + |
| 22 | + |
| 23 | + |
| 24 | +## 解题思路 |
| 25 | + |
| 26 | +**非递归解法** |
| 27 | + |
| 28 | +```javascript |
| 29 | +/** |
| 30 | + * Definition for singly-linked list. |
| 31 | + * function ListNode(val) { |
| 32 | + * this.val = val; |
| 33 | + * this.next = null; |
| 34 | + * } |
| 35 | + */ |
| 36 | +/** |
| 37 | + * @param {ListNode} head |
| 38 | + * @return {ListNode} |
| 39 | + */ |
| 40 | +var reverseList = function(head) { |
| 41 | + let pre = null; |
| 42 | + let cur = head; |
| 43 | + while(cur){ |
| 44 | + let tmp = cur.next; |
| 45 | + cur.next = pre; |
| 46 | + pre = cur; |
| 47 | + cur = tmp; |
| 48 | + } |
| 49 | + return pre; |
| 50 | +}; |
| 51 | +``` |
| 52 | + |
| 53 | +**递归解法** |
| 54 | + |
| 55 | +```javascript |
| 56 | +/** |
| 57 | + * Definition for singly-linked list. |
| 58 | + * function ListNode(val) { |
| 59 | + * this.val = val; |
| 60 | + * this.next = null; |
| 61 | + * } |
| 62 | + */ |
| 63 | +/** |
| 64 | + * @param {ListNode} head |
| 65 | + * @return {ListNode} |
| 66 | + */ |
| 67 | +var reverseList = function (head) { |
| 68 | + let reverse = (pre, cur) => { |
| 69 | + if (!cur) return pre; |
| 70 | + let tmp = cur.next; |
| 71 | + cur.next = pre; |
| 72 | + return reverse(cur, tmp); |
| 73 | + } |
| 74 | + return reverse(null, head); |
| 75 | +}; |
| 76 | +``` |
| 77 | + |
| 78 | + |
| 79 | +## 最后 |
| 80 | +文章产出不易,还望各位小伙伴们支持一波! |
| 81 | + |
| 82 | +往期精选: |
| 83 | + |
| 84 | +<a href="https://github.com/Chocolate1999/Front-end-learning-to-organize-notes">小狮子前端の笔记仓库</a> |
| 85 | + |
| 86 | +<a href="https://github.com/Chocolate1999/leetcode-javascript">leetcode-javascript:LeetCode 力扣的 JavaScript 解题仓库,前端刷题路线(思维导图)</a> |
| 87 | + |
| 88 | +小伙伴们可以在Issues中提交自己的解题代码,🤝 欢迎Contributing,可打卡刷题,Give a ⭐️ if this project helped you! |
| 89 | + |
| 90 | + |
| 91 | +<a href="https://yangchaoyi.vip/">访问超逸の博客</a>,方便小伙伴阅读玩耍~ |
| 92 | + |
| 93 | + |
| 94 | + |
| 95 | +```javascript |
| 96 | +学如逆水行舟,不进则退 |
| 97 | +``` |
| 98 | + |
| 99 | + |
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