{ "data": { "question": { "questionId": "1000262", "questionFrontendId": "LCR 026", "categoryTitle": "Algorithms", "boundTopicId": 910174, "title": "重排链表", "titleSlug": "LGjMqU", "content": "

English description is not available for the problem. Please switch to Chinese.

\n", "translatedTitle": "重排链表", "translatedContent": "

给定一个单链表 L 的头节点 head ，单链表 L 表示为：

\n\n

 L0 → L1 → … → Ln-1 → Ln 
\n请将其重新排列后变为：

\n\n

L0 → Ln → L1 → Ln-1 → L2 → Ln-2 → …

\n\n

不能只是单纯的改变节点内部的值，而是需要实际的进行节点交换。

\n\n

 

\n\n

示例 1:

\n\n

\"\"

\n\n
\n输入: head = [1,2,3,4]\n输出: [1,4,2,3]
\n\n

示例 2:

\n\n

\"\"

\n\n
\n输入: head = [1,2,3,4,5]\n输出: [1,5,2,4,3]
\n\n

 

\n\n

提示：

\n\n\n\n

 

\n\n

注意：本题与主站 143 题相同：https://leetcode-cn.com/problems/reorder-list/ 

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0 : val)\n * this.next = (next===undefined ? null : next)\n * }\n */\n/**\n * @param {ListNode} head\n * @return {void} Do not return anything, modify head in-place instead.\n */\nvar reorderList = function(head) {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "/**\n * Definition for singly-linked list.\n * class ListNode {\n * val: number\n * next: ListNode | null\n * constructor(val?: number, next?: ListNode | null) {\n * this.val = (val===undefined ? 0 : val)\n * this.next = (next===undefined ? null : next)\n * }\n * }\n */\n\n/**\n Do not return anything, modify head in-place instead.\n */\nfunction reorderList(head: ListNode | null): void {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "/**\n * Definition for a singly-linked list.\n * class ListNode {\n * public $val = 0;\n * public $next = null;\n * function __construct($val = 0, $next = null) {\n * $this->val = $val;\n * $this->next = $next;\n * }\n * }\n */\nclass Solution {\n\n /**\n * @param ListNode $head\n * @return NULL\n */\n function reorderList($head) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n * public var val: Int\n * public var next: ListNode?\n * public init() { self.val = 0; self.next = nil; }\n * public init(_ val: Int) { self.val = val; self.next = nil; }\n * public init(_ val: Int, _ next: ListNode?) { self.val = val; self.next = next; }\n * }\n */\nclass Solution {\n func reorderList(_ head: ListNode?) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "/**\n * Example:\n * var li = ListNode(5)\n * var v = li.`val`\n * Definition for singly-linked list.\n * class ListNode(var `val`: Int) {\n * var next: ListNode? = null\n * }\n */\nclass Solution {\n fun reorderList(head: ListNode?): Unit {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "/**\n * Definition for singly-linked list.\n * type ListNode struct {\n * Val int\n * Next *ListNode\n * }\n */\nfunc reorderList(head *ListNode) {\n\n}", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# Definition for singly-linked list.\n# class ListNode\n# attr_accessor :val, :next\n# def initialize(val = 0, _next = nil)\n# @val = val\n# @next = _next\n# end\n# end\n# @param {ListNode} head\n# @return {Void} Do not return anything, modify head in-place instead.\ndef reorder_list(head)\n\nend", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "/**\n * Definition for singly-linked list.\n * class ListNode(_x: Int = 0, _next: ListNode = null) {\n * var next: ListNode = _next\n * var x: Int = _x\n * }\n */\nobject Solution {\n def reorderList(head: ListNode): Unit = {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "// Definition for singly-linked list.\n// #[derive(PartialEq, Eq, Clone, Debug)]\n// pub struct ListNode {\n// pub val: i32,\n// pub next: Option>\n// }\n//\n// impl ListNode {\n// #[inline]\n// fn new(val: i32) -> Self {\n// ListNode {\n// next: None,\n// val\n// }\n// }\n// }\nimpl Solution {\n pub fn reorder_list(head: &mut Option>) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "; Definition for singly-linked list:\n#|\n\n; val : integer?\n; next : (or/c list-node? 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