leetcode-problemset/leetcode-cn/originData/remove-duplicate-node-lcci.json

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        "question": {
            "questionId": "100163",
            "questionFrontendId": "面试题 02.01",
            "categoryTitle": "LCCI",
            "boundTopicId": 45635,
            "title": "Remove Duplicate Node LCCI",
            "titleSlug": "remove-duplicate-node-lcci",
            "content": "<p>Write code to remove duplicates from an unsorted linked list.</p>\r\n\r\n<p><strong>Example1:</strong></p>\r\n\r\n<pre>\r\n<strong> Input</strong>: [1, 2, 3, 3, 2, 1]\r\n<strong> Output</strong>: [1, 2, 3]\r\n</pre>\r\n\r\n<p><strong>Example2:</strong></p>\r\n\r\n<pre>\r\n<strong> Input</strong>: [1, 1, 1, 1, 2]\r\n<strong> Output</strong>: [1, 2]\r\n</pre>\r\n\r\n<p><strong>Note: </strong></p>\r\n\r\n<ol>\r\n\t<li>The length of the list is within the range[0, 20000].</li>\r\n\t<li>The values of the list elements are within the range [0, 20000].</li>\r\n</ol>\r\n\r\n<p><strong>Follow Up: </strong></p>\r\n\r\n<p>How would you solve this problem if a temporary buffer is not allowed?</p>\r\n",
            "translatedTitle": "移除重复节点",
            "translatedContent": "<p>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。</p>\n\n<p> <strong>示例1:</strong></p>\n\n<pre>\n<strong> 输入</strong>：[1, 2, 3, 3, 2, 1]\n<strong> 输出</strong>：[1, 2, 3]\n</pre>\n\n<p> <strong>示例2:</strong></p>\n\n<pre>\n<strong> 输入</strong>：[1, 1, 1, 1, 2]\n<strong> 输出</strong>：[1, 2]\n</pre>\n\n<p><strong>提示：</strong></p>\n\n<ol>\n<li>链表长度在[0, 20000]范围内。</li>\n<li>链表元素在[0, 20000]范围内。</li>\n</ol>\n\n<p> <strong>进阶：</strong></p>\n\n<p>如果不得使用临时缓冲区，该怎么解决？</p>\n",
            "isPaidOnly": false,
            "difficulty": "Easy",
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                    "name": "Hash Table",
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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(int x) : val(x), next(NULL) {}\n * };\n */\nclass Solution {\npublic:\n    ListNode* removeDuplicateNodes(ListNode* head) {\n\n    }\n};",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n *     int val;\n *     ListNode next;\n *     ListNode(int x) { val = x; }\n * }\n */\nclass Solution {\n    public ListNode removeDuplicateNodes(ListNode head) {\n\n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "# Definition for singly-linked list.\n# class ListNode(object):\n#     def __init__(self, x):\n#         self.val = x\n#         self.next = None\n\nclass Solution(object):\n    def removeDuplicateNodes(self, head):\n        \"\"\"\n        :type head: ListNode\n        :rtype: ListNode\n        \"\"\"",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "# Definition for singly-linked list.\n# class ListNode:\n#     def __init__(self, x):\n#         self.val = x\n#         self.next = None\n\nclass Solution:\n    def removeDuplicateNodes(self, head: ListNode) -> ListNode:",
                    "__typename": "CodeSnippetNode"
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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 */\n\n\nstruct ListNode* removeDuplicateNodes(struct ListNode* head){\n\n}\n",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "/**\n * Definition for singly-linked list.\n * public class ListNode {\n *     public int val;\n *     public ListNode next;\n *     public ListNode(int x) { val = x; }\n * }\n */\npublic class Solution {\n    public ListNode RemoveDuplicateNodes(ListNode head) {\n\n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * Definition for singly-linked list.\n * function ListNode(val) {\n *     this.val = val;\n *     this.next = null;\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};",
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                {
                    "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) { $this->val = $val; }\n * }\n */\nclass Solution {\n\n    /**\n     * @param ListNode $head\n     * @return ListNode\n     */\n    function removeDuplicateNodes($head) {\n\n    }\n}",
                    "__typename": "CodeSnippetNode"
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                {
                    "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(_ val: Int) {\n *         self.val = val\n *         self.next = nil\n *     }\n * }\n */\nclass Solution {\n    func removeDuplicateNodes(_ head: ListNode?) -> ListNode? {\n\n    }\n}",
                    "__typename": "CodeSnippetNode"
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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 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"
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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)\n#         @val = val\n#         @next = nil\n#     end\n# end\n\n# @param {ListNode} head\n# @return {ListNode}\ndef remove_duplicate_nodes(head)\n\nend",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "/**\n * Definition for singly-linked list.\n * class ListNode(var _x: Int = 0) {\n *   var next: ListNode = null\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<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 remove_duplicate_nodes(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {\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\n  )",
                    "__typename": "CodeSnippetNode"
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                    "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"
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            "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\"}}",
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