{ "data": { "question": { "questionId": "528", "questionFrontendId": "1721", "categoryTitle": "Algorithms", "boundTopicId": 10296, "title": "Swapping Nodes in a Linked List", "titleSlug": "swapping-nodes-in-a-linked-list", "content": "

You are given the head of a linked list, and an integer k.

\n\n

Return the head of the linked list after swapping the values of the kth node from the beginning and the kth node from the end (the list is 1-indexed).

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: head = [1,2,3,4,5], k = 2\nOutput: [1,4,3,2,5]\n
\n\n

Example 2:

\n\n
\nInput: head = [7,9,6,6,7,8,3,0,9,5], k = 5\nOutput: [7,9,6,6,8,7,3,0,9,5]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "交换链表中的节点", "translatedContent": "

给你链表的头节点 head 和一个整数 k

\n\n

交换 链表正数第 k 个节点和倒数第 k 个节点的值后,返回链表的头节点(链表 从 1 开始索引)。

\n\n

 

\n\n

示例 1:

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

示例 2:

\n\n
\n输入:head = [7,9,6,6,7,8,3,0,9,5], k = 5\n输出:[7,9,6,6,8,7,3,0,9,5]\n
\n\n

示例 3:

\n\n
\n输入:head = [1], k = 1\n输出:[1]\n
\n\n

示例 4:

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

示例 5:

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

 

\n\n

提示:

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0 : val)\n * this.next = (next===undefined ? null : next)\n * }\n */\n/**\n * @param {ListNode} head\n * @param {number} k\n * @return {ListNode}\n */\nvar swapNodes = function(head, k) {\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# @param {Integer} k\n# @return {ListNode}\ndef swap_nodes(head, k)\n\nend", "__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 swapNodes(_ head: ListNode?, _ k: Int) -> ListNode? {\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 swapNodes(head *ListNode, k int) *ListNode {\n\n}", "__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 swapNodes(head: ListNode, k: Int): 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 swapNodes(head: ListNode?, k: Int): ListNode? {\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 swap_nodes(head: Option>, k: i32) -> Option> {\n\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 * @param Integer $k\n * @return ListNode\n */\n function swapNodes($head, $k) {\n\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\nfunction swapNodes(head: ListNode | null, k: number): ListNode | null {\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? #f)\n(struct list-node\n (val next) #:mutable #:transparent)\n\n; constructor\n(define (make-list-node [val 0])\n (list-node val #f))\n\n|#\n\n(define/contract (swap-nodes head k)\n (-> (or/c list-node? #f) exact-integer? (or/c list-node? #f))\n\n )", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "%% Definition for singly-linked list.\n%%\n%% -record(list_node, {val = 0 :: integer(),\n%% next = null :: 'null' | #list_node{}}).\n\n-spec swap_nodes(Head :: #list_node{} | null, K :: integer()) -> #list_node{} | null.\nswap_nodes(Head, K) ->\n .", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "# Definition for singly-linked list.\n#\n# defmodule ListNode do\n# @type t :: %__MODULE__{\n# val: integer,\n# next: ListNode.t() | nil\n# }\n# defstruct val: 0, next: nil\n# end\n\ndefmodule Solution do\n @spec swap_nodes(head :: ListNode.t | nil, k :: integer) :: ListNode.t | nil\n def swap_nodes(head, k) do\n\n end\nend", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"14.5K\", \"totalSubmission\": \"22.7K\", \"totalAcceptedRaw\": 14474, \"totalSubmissionRaw\": 22657, \"acRate\": \"63.9%\"}", "hints": [ "We can transform the linked list to an array this should ease things up", "After transforming the linked list to an array it becomes as easy as swapping two integers in an array then rebuilding the linked list" ], "solution": null, "status": null, "sampleTestCase": "[1,2,3,4,5]\n2", "metaData": "{\r\n \"name\": \"swapNodes\",\r\n \"params\": [\r\n {\r\n \"name\": \"head\",\r\n \"type\": \"ListNode\"\r\n },\r\n {\r\n \"name\": \"k\",\r\n \"type\": \"integer\"\r\n }\r\n ],\r\n \"return\": {\r\n \"type\": \"ListNode\"\r\n }\r\n}\r\n", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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