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        "question": {
            "questionId": "449",
            "questionFrontendId": "449",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1867,
            "title": "Serialize and Deserialize BST",
            "titleSlug": "serialize-and-deserialize-bst",
            "content": "<p>Serialization is converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.</p>\n\n<p>Design an algorithm to serialize and deserialize a <b>binary search tree</b>. There is no restriction on how your serialization/deserialization algorithm should work. You need to ensure that a binary search tree can be serialized to a string, and this string can be deserialized to the original tree structure.</p>\n\n<p><b>The encoded string should be as compact as possible.</b></p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<pre><strong>Input:</strong> root = [2,1,3]\n<strong>Output:</strong> [2,1,3]\n</pre><p><strong class=\"example\">Example 2:</strong></p>\n<pre><strong>Input:</strong> root = []\n<strong>Output:</strong> []\n</pre>\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[0, 10<sup>4</sup>]</code>.</li>\n\t<li><code>0 &lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li>The input tree is <strong>guaranteed</strong> to be a binary search tree.</li>\n</ul>\n",
            "translatedTitle": "序列化和反序列化二叉搜索树",
            "translatedContent": "<p>序列化是将数据结构或对象转换为一系列位的过程,以便它可以存储在文件或内存缓冲区中,或通过网络连接链路传输,以便稍后在同一个或另一个计算机环境中重建。</p>\n\n<p>设计一个算法来序列化和反序列化<strong> 二叉搜索树</strong> 。 对序列化/反序列化算法的工作方式没有限制。 您只需确保二叉搜索树可以序列化为字符串,并且可以将该字符串反序列化为最初的二叉搜索树。</p>\n\n<p><strong>编码的字符串应尽可能紧凑。</strong></p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>root = [2,1,3]\n<strong>输出:</strong>[2,1,3]\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>root = []\n<strong>输出:</strong>[]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中节点数范围是 <code>[0, 10<sup>4</sup>]</code></li>\n\t<li><code>0 &lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li>题目数据 <strong>保证</strong> 输入的树是一棵二叉搜索树。</li>\n</ul>\n",
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                    "name": "Tree",
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                    "name": "Depth-First Search",
                    "slug": "depth-first-search",
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                    "translatedName": "设计",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n *     int val;\n *     TreeNode *left;\n *     TreeNode *right;\n *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}\n * };\n */\nclass Codec {\npublic:\n\n    // Encodes a tree to a single string.\n    string serialize(TreeNode* root) {\n        \n    }\n\n    // Decodes your encoded data to tree.\n    TreeNode* deserialize(string data) {\n        \n    }\n};\n\n// Your Codec object will be instantiated and called as such:\n// Codec* ser = new Codec();\n// Codec* deser = new Codec();\n// string tree = ser->serialize(root);\n// TreeNode* ans = deser->deserialize(tree);\n// return ans;",
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                    "lang": "Java",
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                    "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n *     int val;\n *     TreeNode left;\n *     TreeNode right;\n *     TreeNode(int x) { val = x; }\n * }\n */\npublic class Codec {\n\n    // Encodes a tree to a single string.\n    public String serialize(TreeNode root) {\n        \n    }\n\n    // Decodes your encoded data to tree.\n    public TreeNode deserialize(String data) {\n        \n    }\n}\n\n// Your Codec object will be instantiated and called as such:\n// Codec ser = new Codec();\n// Codec deser = new Codec();\n// String tree = ser.serialize(root);\n// TreeNode ans = deser.deserialize(tree);\n// return ans;",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
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                    "code": "# Definition for a binary tree node.\n# class TreeNode(object):\n#     def __init__(self, x):\n#         self.val = x\n#         self.left = None\n#         self.right = None\n\nclass Codec:\n\n    def serialize(self, root):\n        \"\"\"Encodes a tree to a single string.\n        \n        :type root: TreeNode\n        :rtype: str\n        \"\"\"\n        \n\n    def deserialize(self, data):\n        \"\"\"Decodes your encoded data to tree.\n        \n        :type data: str\n        :rtype: TreeNode\n        \"\"\"\n        \n\n# Your Codec object will be instantiated and called as such:\n# ser = Codec()\n# deser = Codec()\n# tree = ser.serialize(root)\n# ans = deser.deserialize(tree)\n# return ans",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "# Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, x):\n#         self.val = x\n#         self.left = None\n#         self.right = None\n\nclass Codec:\n\n    def serialize(self, root: Optional[TreeNode]) -> str:\n        \"\"\"Encodes a tree to a single string.\n        \"\"\"\n        \n\n    def deserialize(self, data: str) -> Optional[TreeNode]:\n        \"\"\"Decodes your encoded data to tree.\n        \"\"\"\n        \n\n# Your Codec object will be instantiated and called as such:\n# Your Codec object will be instantiated and called as such:\n# ser = Codec()\n# deser = Codec()\n# tree = ser.serialize(root)\n# ans = deser.deserialize(tree)\n# return ans",
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                    "code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n *     int val;\n *     struct TreeNode *left;\n *     struct TreeNode *right;\n * };\n */\n/** Encodes a tree to a single string. */\nchar* serialize(struct TreeNode* root) {\n    \n}\n\n/** Decodes your encoded data to tree. */\nstruct TreeNode* deserialize(char* data) {\n    \n}\n\n// Your functions will be called as such:\n// char* data = serialize(root);\n// deserialize(data);",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n *     public int val;\n *     public TreeNode left;\n *     public TreeNode right;\n *     public TreeNode(int x) { val = x; }\n * }\n */\npublic class Codec {\n\n    // Encodes a tree to a single string.\n    public string serialize(TreeNode root) {\n        \n    }\n\n    // Decodes your encoded data to tree.\n    public TreeNode deserialize(string data) {\n        \n    }\n}\n\n// Your Codec object will be instantiated and called as such:\n// Codec ser = new Codec();\n// Codec deser = new Codec();\n// String tree = ser.serialize(root);\n// TreeNode ans = deser.deserialize(tree);\n// return ans;",
                    "__typename": "CodeSnippetNode"
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                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * Definition for a binary tree node.\n * function TreeNode(val) {\n *     this.val = val;\n *     this.left = this.right = null;\n * }\n */\n\n/**\n * Encodes a tree to a single string.\n *\n * @param {TreeNode} root\n * @return {string}\n */\nvar serialize = function(root) {\n    \n};\n\n/**\n * Decodes your encoded data to tree.\n *\n * @param {string} data\n * @return {TreeNode}\n */\nvar deserialize = function(data) {\n    \n};\n\n/**\n * Your functions will be called as such:\n * deserialize(serialize(root));\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n *     val: number\n *     left: TreeNode | null\n *     right: TreeNode | null\n *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {\n *         this.val = (val===undefined ? 0 : val)\n *         this.left = (left===undefined ? null : left)\n *         this.right = (right===undefined ? null : right)\n *     }\n * }\n */\n\n/*\n * Encodes a tree to a single string.\n */\nfunction serialize(root: TreeNode | null): string {\n\n};\n\n/*\n * Decodes your encoded data to tree.\n */\nfunction deserialize(data: string): TreeNode | null {\n\n};\n\n\n/**\n * Your functions will be called as such:\n * deserialize(serialize(root));\n */",
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                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n *     public $val = null;\n *     public $left = null;\n *     public $right = null;\n *     function __construct($value) { $this->val = $value; }\n * }\n */\n\nclass Codec {\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param TreeNode $root\n     * @return String\n     */\n    function serialize($root) {\n        \n    }\n  \n    /**\n     * @param String $data\n     * @return TreeNode\n     */\n    function deserialize($data) {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * $ser = new Codec();\n * $tree = $ser->serialize($param_1);\n * $deser = new Codec();\n * $ret = $deser->deserialize($tree);\n * return $ret;\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Swift",
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                    "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n *     public var val: Int\n *     public var left: TreeNode?\n *     public var right: TreeNode?\n *     public init(_ val: Int) {\n *         self.val = val\n *         self.left = nil\n *         self.right = nil\n *     }\n * }\n */\n\nclass Codec {\n    // Encodes a tree to a single string.\n    func serialize(_ root: TreeNode?) -> String {\n        \n    }\n    \n    // Decodes your encoded data to tree.\n    func deserialize(_ data: String) -> TreeNode? {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * let ser = Codec()\n * let deser = Codec()\n * let tree: String = ser.serialize(root)\n * let ans = deser.deserialize(tree)\n * return ans\n*/",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Kotlin",
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                    "code": "/**\n * Definition for a binary tree node.\n * class TreeNode(var `val`: Int) {\n *     var left: TreeNode? = null\n *     var right: TreeNode? = null\n * }\n */\n\nclass Codec() {\n\t// Encodes a tree to a single string.\n    fun serialize(root: TreeNode?): String {\n        \n    }\n\n    // Decodes your encoded data to tree.\n    fun deserialize(data: String): TreeNode? {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * val ser = Codec()\n * val deser = Codec()\n * val tree: String = ser.serialize(root)\n * val ans = deser.deserialize(tree)\n * return ans\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Go",
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                    "code": "/**\n * Definition for a binary tree node.\n * type TreeNode struct {\n *     Val int\n *     Left *TreeNode\n *     Right *TreeNode\n * }\n */\n\ntype Codec struct {\n    \n}\n\nfunc Constructor() Codec {\n    \n}\n\n// Serializes a tree to a single string.\nfunc (this *Codec) serialize(root *TreeNode) string {\n    \n}\n\n// Deserializes your encoded data to tree.\nfunc (this *Codec) deserialize(data string) *TreeNode {    \n    \n}\n\n\n/**\n * Your Codec object will be instantiated and called as such:\n * ser := Constructor()\n * deser := Constructor()\n * tree := ser.serialize(root)\n * ans := deser.deserialize(tree)\n * return ans\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Ruby",
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                    "code": "# Definition for a binary tree node.\n# class TreeNode\n#     attr_accessor :val, :left, :right\n#     def initialize(val)\n#         @val = val\n#         @left, @right = nil, nil\n#     end\n# end\n\n# Encodes a tree to a single string.\n#\n# @param {TreeNode} root\n# @return {string}\ndef serialize(root)\n    \nend\n\n# Decodes your encoded data to tree.\n#\n# @param {string} data\n# @return {TreeNode}\ndef deserialize(data)\n    \nend\n\n\n# Your functions will be called as such:\n# deserialize(serialize(data))",
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                    "lang": "Scala",
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                    "code": "/**\n * Definition for a binary tree node.\n * class TreeNode(var _value: Int) {\n *   var value: Int = _value\n *   var left: TreeNode = null\n *   var right: TreeNode = null\n * }\n */\n\nclass Codec {\n    // Encodes a tree to a single string.\n    def serialize(root: TreeNode): String = {\n        \n    }\n    \n    // Decodes your encoded data to tree.\n    def deserialize(data: String): TreeNode = {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * val ser = new Codec()\n * val deser = new Codec()\n * val tree: String = ser.serialize(root)\n * val ans = deser.deserialize(tree)\n * return ans\n */",
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                    "code": "// Definition for a binary tree node.\n// #[derive(Debug, PartialEq, Eq)]\n// pub struct TreeNode {\n//   pub val: i32,\n//   pub left: Option<Rc<RefCell<TreeNode>>>,\n//   pub right: Option<Rc<RefCell<TreeNode>>>,\n// }\n// \n// impl TreeNode {\n//   #[inline]\n//   pub fn new(val: i32) -> Self {\n//     TreeNode {\n//       val,\n//       left: None,\n//       right: None\n//     }\n//   }\n// }\nuse std::rc::Rc;\nuse std::cell::RefCell;\nstruct Codec {\n\t\n}\n\n/** \n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Codec {\n    fn new() -> Self {\n        \n    }\n\n    fn serialize(&self, root: Option<Rc<RefCell<TreeNode>>>) -> String {\n        \n    }\n\t\n    fn deserialize(&self, data: String) -> Option<Rc<RefCell<TreeNode>>> {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * let obj = Codec::new();\n * let data: String = obj.serialize(strs);\n * let ans: Option<Rc<RefCell<TreeNode>>> = obj.deserialize(data);\n */",
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