{ "data": { "question": { "questionId": "100163", "questionFrontendId": "面试题 02.01", "categoryTitle": "LCCI", "boundTopicId": 45635, "title": "Remove Duplicate Node LCCI", "titleSlug": "remove-duplicate-node-lcci", "content": "

Write code to remove duplicates from an unsorted linked list.

\r\n\r\n

Example1:

\r\n\r\n
\r\n Input: [1, 2, 3, 3, 2, 1]\r\n Output: [1, 2, 3]\r\n
\r\n\r\n

Example2:

\r\n\r\n
\r\n Input: [1, 1, 1, 1, 2]\r\n Output: [1, 2]\r\n
\r\n\r\n

Note:

\r\n\r\n
    \r\n\t
  1. The length of the list is within the range[0, 20000].
    2. \r\n\t
  2. The values of the list elements are within the range [0, 20000].
    3. \r\n
\r\n\r\n

Follow Up:

\r\n\r\n

How would you solve this problem if a temporary buffer is not allowed?

\r\n", "translatedTitle": "移除重复节点", "translatedContent": "

编写代码，移除未排序链表中的重复节点。保留最开始出现的节点。

\n\n

示例1：

\n\n
\n 输入：[1, 2, 3, 3, 2, 1]\n 输出：[1, 2, 3]\n
\n\n

示例2：

\n\n
\n 输入：[1, 1, 1, 1, 2]\n 输出：[1, 2]\n
\n\n

提示：

\n\n
    \n\t
  1. 链表长度在[0, 20000]范围内。
    2. \n\t
  2. 链表元素在[0, 20000]范围内。
    3. \n
\n\n

进阶：

\n\n

如果不得使用临时缓冲区，该怎么解决？

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0 : val)\n * this.next = (next===undefined ? null : next)\n * }\n */\n/**\n * @param {ListNode} head\n * @return {ListNode}\n */\nvar removeDuplicateNodes = 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\nfunction removeDuplicateNodes(head: ListNode | null): ListNode | null {\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 $head\n * @return ListNode\n */\n function removeDuplicateNodes($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 removeDuplicateNodes(_ head: ListNode?) -> 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 removeDuplicateNodes(head: ListNode?): ListNode? {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "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? removeDuplicateNodes(ListNode? head) {\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 removeDuplicateNodes(head *ListNode) *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 {ListNode}\ndef remove_duplicate_nodes(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 removeDuplicateNodes(head: ListNode): 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 remove_duplicate_nodes(head: Option>) -> 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? #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 (remove-duplicate-nodes head)\n (-> (or/c list-node? #f) (or/c list-node? #f))\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 remove_duplicate_nodes(Head :: #list_node{} | null) -> #list_node{} | null.\nremove_duplicate_nodes(Head) ->\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 remove_duplicate_nodes(head :: ListNode.t | nil) :: ListNode.t | nil\n def remove_duplicate_nodes(head) do\n \n end\nend", "__typename": "CodeSnippetNode" }, { "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 removeDuplicateNodes(head: ?ListNode): ?ListNode {\n\n }\n}", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"106.2K\", \"totalSubmission\": \"160.3K\", \"totalAcceptedRaw\": 106237, \"totalSubmissionRaw\": 160279, \"acRate\": \"66.3%\"}", "hints": [ "你有没有试过一个散列表？你应该可以通过一次链表遍历做到这一点。", "没有额外的空间，你需要O(N2)的时间。尝试使用两个指针，其中第二个指针在第一个指针之前搜索。" ], "solution": null, "status": null, "sampleTestCase": "[1, 2, 3, 3, 2, 1]", "metaData": "{\"name\": \"removeDuplicateNodes\", \"params\": [{\"name\": \"head\", \"type\": \"ListNode\"}], \"return\": {\"type\": \"ListNode\"}}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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