mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
20 KiB
JSON
182 lines
20 KiB
JSON
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"question": {
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"questionId": "528",
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"questionFrontendId": "1721",
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"boundTopicId": null,
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"title": "Swapping Nodes in a Linked List",
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"titleSlug": "swapping-nodes-in-a-linked-list",
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"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> </p>\n<p><strong>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>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> </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 <= 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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"difficulty": "Medium",
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"exampleTestcases": "[1,2,3,4,5]\n2\n[7,9,6,6,7,8,3,0,9,5]\n5",
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"categoryTitle": "Algorithms",
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"name": "Linked List",
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"name": "Two Pointers",
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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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{
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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: ListNode\n :type k: int\n :rtype: ListNode\n \"\"\"\n ",
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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",
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"langSlug": "c",
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"code": "/**\n * Definition for singly-linked list.\n * struct ListNode {\n * int val;\n * struct ListNode *next;\n * };\n */\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}",
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"lang": "JavaScript",
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"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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{
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"lang": "Ruby",
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"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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{
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"lang": "Swift",
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"langSlug": "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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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Go",
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"langSlug": "golang",
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"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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"__typename": "CodeSnippetNode"
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{
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"lang": "Scala",
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"langSlug": "scala",
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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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"lang": "Kotlin",
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"langSlug": "kotlin",
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"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": "Rust",
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"langSlug": "rust",
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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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"__typename": "CodeSnippetNode"
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},
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"lang": "PHP",
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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}",
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"__typename": "CodeSnippetNode"
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"lang": "TypeScript",
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"langSlug": "typescript",
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"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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"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\n )",
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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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"lang": "Elixir",
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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",
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"We can transform the linked list to an array this should ease things up",
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"After transforming the linked list to an array it becomes as easy as swapping two integers in an array then rebuilding the linked list"
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