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            "questionId": "21",
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            "categoryTitle": "Algorithms",
            "boundTopicId": 1080,
            "title": "Merge Two Sorted Lists",
            "titleSlug": "merge-two-sorted-lists",
            "content": "<p>You are given the heads of two sorted linked lists <code>list1</code> and <code>list2</code>.</p>\n\n<p>Merge the two lists into one <strong>sorted</strong> list. The list should be made by splicing together the nodes of the first two lists.</p>\n\n<p>Return <em>the head of the merged linked list</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/2020/10/03/merge_ex1.jpg\" style=\"width: 662px; height: 302px;\" />\n<pre>\n<strong>Input:</strong> list1 = [1,2,4], list2 = [1,3,4]\n<strong>Output:</strong> [1,1,2,3,4,4]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> list1 = [], list2 = []\n<strong>Output:</strong> []\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> list1 = [], list2 = [0]\n<strong>Output:</strong> [0]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in both lists is in the range <code>[0, 50]</code>.</li>\n\t<li><code>-100 &lt;= Node.val &lt;= 100</code></li>\n\t<li>Both <code>list1</code> and <code>list2</code> are sorted in <strong>non-decreasing</strong> order.</li>\n</ul>\n",
            "translatedTitle": "合并两个有序链表",
            "translatedContent": "<p>将两个升序链表合并为一个新的 <strong>升序</strong> 链表并返回。新链表是通过拼接给定的两个链表的所有节点组成的。 </p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/10/03/merge_ex1.jpg\" style=\"width: 662px; height: 302px;\" />\n<pre>\n<strong>输入：</strong>l1 = [1,2,4], l2 = [1,3,4]\n<strong>输出：</strong>[1,1,2,3,4,4]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>l1 = [], l2 = []\n<strong>输出：</strong>[]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>l1 = [], l2 = [0]\n<strong>输出：</strong>[0]\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>两个链表的节点数目范围是 <code>[0, 50]</code></li>\n\t<li><code>-100 <= Node.val <= 100</code></li>\n\t<li><code>l1</code> 和 <code>l2</code> 均按 <strong>非递减顺序</strong> 排列</li>\n</ul>\n",
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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* mergeTwoLists(ListNode* list1, ListNode* list2) {\n        \n    }\n};",
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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 mergeTwoLists(ListNode list1, ListNode list2) {\n        \n    }\n}",
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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 mergeTwoLists(self, list1, list2):\n        \"\"\"\n        :type list1: Optional[ListNode]\n        :type list2: Optional[ListNode]\n        :rtype: Optional[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 mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]:\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 *     struct ListNode *next;\n * };\n */\nstruct ListNode* mergeTwoLists(struct ListNode* list1, struct ListNode* list2) {\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 MergeTwoLists(ListNode list1, ListNode list2) {\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} list1\n * @param {ListNode} list2\n * @return {ListNode}\n */\nvar mergeTwoLists = function(list1, list2) {\n    \n};",
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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 mergeTwoLists(list1: ListNode | null, list2: ListNode | null): 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 $list1\n     * @param ListNode $list2\n     * @return ListNode\n     */\n    function mergeTwoLists($list1, $list2) {\n        \n    }\n}",
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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 mergeTwoLists(_ list1: ListNode?, _ list2: ListNode?) -> ListNode? {\n        \n    }\n}",
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                    "lang": "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 mergeTwoLists(list1: ListNode?, list2: ListNode?): ListNode? {\n        \n    }\n}",
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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? mergeTwoLists(ListNode? list1, ListNode? list2) {\n    \n  }\n}",
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                    "code": "/**\n * Definition for singly-linked list.\n * type ListNode struct {\n *     Val int\n *     Next *ListNode\n * }\n */\nfunc mergeTwoLists(list1 *ListNode, list2 *ListNode) *ListNode {\n    \n}",
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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} list1\n# @param {ListNode} list2\n# @return {ListNode}\ndef merge_two_lists(list1, list2)\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 mergeTwoLists(list1: ListNode, list2: ListNode): 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 merge_two_lists(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {\n        \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 merge_two_lists(List1 :: #list_node{} | null, List2 :: #list_node{} | null) -> #list_node{} | null.\nmerge_two_lists(List1, List2) ->\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 merge_two_lists(list1 :: ListNode.t | nil, list2 :: ListNode.t | nil) :: ListNode.t | nil\n  def merge_two_lists(list1, list2) do\n    \n  end\nend",
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                    "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 mergeTwoLists(list1: ?ListNode, list2: ?ListNode): ?ListNode {\n\n    }\n}",
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