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        "question": {
            "questionId": "528",
            "questionFrontendId": "1721",
            "categoryTitle": "Algorithms",
            "boundTopicId": 10296,
            "title": "Swapping Nodes in a Linked List",
            "titleSlug": "swapping-nodes-in-a-linked-list",
            "content": "<p>You are given the <code>head</code> of a linked list, and an integer <code>k</code>.</p>\n\n<p>Return <em>the head of the linked list after <strong>swapping</strong> the values of the </em><code>k<sup>th</sup></code> <em>node from the beginning and the </em><code>k<sup>th</sup></code> <em>node from the end (the list is <strong>1-indexed</strong>).</em></p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/21/linked1.jpg\" style=\"width: 400px; height: 112px;\" />\n<pre>\n<strong>Input:</strong> head = [1,2,3,4,5], k = 2\n<strong>Output:</strong> [1,4,3,2,5]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> head = [7,9,6,6,7,8,3,0,9,5], k = 5\n<strong>Output:</strong> [7,9,6,6,8,7,3,0,9,5]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the list is <code>n</code>.</li>\n\t<li><code>1 &lt;= k &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= Node.val &lt;= 100</code></li>\n</ul>\n",
            "translatedTitle": "交换链表中的节点",
            "translatedContent": "<p>给你链表的头节点 <code>head</code> 和一个整数 <code>k</code> 。</p>\n\n<p><strong>交换</strong> 链表正数第 <code>k</code> 个节点和倒数第 <code>k</code> 个节点的值后，返回链表的头节点（链表 <strong>从 1 开始索引</strong>）。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2021/01/10/linked1.jpg\" style=\"width: 722px; height: 202px;\" />\n<pre>\n<strong>输入：</strong>head = [1,2,3,4,5], k = 2\n<strong>输出：</strong>[1,4,3,2,5]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>head = [7,9,6,6,7,8,3,0,9,5], k = 5\n<strong>输出：</strong>[7,9,6,6,8,7,3,0,9,5]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>head = [1], k = 1\n<strong>输出：</strong>[1]\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<strong>输入：</strong>head = [1,2], k = 1\n<strong>输出：</strong>[2,1]\n</pre>\n\n<p><strong>示例 5：</strong></p>\n\n<pre>\n<strong>输入：</strong>head = [1,2,3], k = 2\n<strong>输出：</strong>[1,2,3]\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>链表中节点的数目是 <code>n</code></li>\n\t<li><code>1 <= k <= n <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= Node.val <= 100</code></li>\n</ul>\n",
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                    "lang": "C++",
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                    "code": "/**\n * Definition for singly-linked list.\n * struct ListNode {\n *     int val;\n *     ListNode *next;\n *     ListNode() : val(0), next(nullptr) {}\n *     ListNode(int x) : val(x), next(nullptr) {}\n *     ListNode(int x, ListNode *next) : val(x), next(next) {}\n * };\n */\nclass Solution {\npublic:\n    ListNode* swapNodes(ListNode* head, int k) {\n        \n    }\n};",
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                {
                    "lang": "Java",
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                    "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n *     int val;\n *     ListNode next;\n *     ListNode() {}\n *     ListNode(int val) { this.val = val; }\n *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }\n * }\n */\nclass Solution {\n    public ListNode swapNodes(ListNode head, int k) {\n        \n    }\n}",
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                {
                    "lang": "Python",
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                    "code": "# Definition for singly-linked list.\n# class ListNode(object):\n#     def __init__(self, val=0, next=None):\n#         self.val = val\n#         self.next = next\nclass Solution(object):\n    def swapNodes(self, head, k):\n        \"\"\"\n        :type head: Optional[ListNode]\n        :type k: int\n        :rtype: Optional[ListNode]\n        \"\"\"\n        ",
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                    "lang": "Python3",
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                    "code": "# Definition for singly-linked list.\n# class ListNode:\n#     def __init__(self, val=0, next=None):\n#         self.val = val\n#         self.next = next\nclass Solution:\n    def swapNodes(self, head: Optional[ListNode], k: int) -> Optional[ListNode]:\n        ",
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                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "/**\n * Definition for singly-linked list.\n * struct ListNode {\n *     int val;\n *     struct ListNode *next;\n * };\n */\nstruct ListNode* swapNodes(struct ListNode* head, int k) {\n    \n}",
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                    "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n *     public int val;\n *     public ListNode next;\n *     public ListNode(int val=0, ListNode next=null) {\n *         this.val = val;\n *         this.next = next;\n *     }\n * }\n */\npublic class Solution {\n    public ListNode SwapNodes(ListNode head, int k) {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * Definition for singly-linked list.\n * function ListNode(val, next) {\n *     this.val = (val===undefined ? 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};",
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                {
                    "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};",
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                    "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"
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                    "lang": "Swift",
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                    "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}",
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                {
                    "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}",
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                    "lang": "Dart",
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                    "code": "/**\n * Definition for singly-linked list.\n * class ListNode {\n *   int val;\n *   ListNode? next;\n *   ListNode([this.val = 0, this.next]);\n * }\n */\nclass Solution {\n  ListNode? swapNodes(ListNode? head, int k) {\n    \n  }\n}",
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                    "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}",
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                    "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",
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                    "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}",
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                    "code": "// Definition for singly-linked list.\n// #[derive(PartialEq, Eq, Clone, Debug)]\n// pub struct ListNode {\n//   pub val: i32,\n//   pub next: Option<Box<ListNode>>\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<Box<ListNode>>, k: i32) -> Option<Box<ListNode>> {\n        \n    }\n}",
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                    "lang": "Racket",
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                    "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  )",
                    "__typename": "CodeSnippetNode"
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                    "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  .",
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                    "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"
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                    "lang": "Cangjie",
                    "langSlug": "cangjie",
                    "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n *     public var val: Int64\n *     public var next: ?ListNode\n *     public init() {\n *         val = 0\n *         next = None\n *     }\n *     public init(val: Int64) {\n *         this.val = val\n *         next = None\n *     }\n * }\n */\n\nclass Solution {\n    func swapNodes(head: ?ListNode, k: Int64): ?ListNode {\n\n    }\n}",
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            "hints": [
                "We can traverse the linked list and store the elements in an array.",
                "Upon conversion to an array, we can swap the required elements by indexing the array.",
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