U7WvvU.json

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        "question": {
            "questionId": "1000479",
            "questionFrontendId": "LCP 64",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1845923,
            "title": "二叉树灯饰",
            "titleSlug": "U7WvvU",
            "content": "",
            "translatedTitle": "二叉树灯饰",
            "translatedContent": "「力扣嘉年华」的中心广场放置了一个巨型的二叉树形状的装饰树。每个节点上均有一盏灯和三个开关。节点值为 `0` 表示灯处于「关闭」状态，节点值为 `1` 表示灯处于「开启」状态。每个节点上的三个开关各自功能如下：\n- 开关 `1`：切换当前节点的灯的状态；\n- 开关 `2`：切换 **以当前节点为根** 的子树中，所有节点上的灯的状态，；\n- 开关 `3`：切换 **当前节点及其左右子节点**（若存在的话） 上的灯的状态；\n\n给定该装饰的初始状态 `root`，请返回最少需要操作多少次开关，可以关闭所有节点的灯。\n\n**示例 1：**\n>输入：`root = [1,1,0,null,null,null,1]`\n>\n>输出：`2`\n>\n>解释：以下是最佳的方案之一，如图所示\n![b71b95bf405e3b223e00b2820a062ba4.gif](https://pic.leetcode-cn.com/1629357030-GSbzpY-b71b95bf405e3b223e00b2820a062ba4.gif){:width=\"300px\"}\n\n**示例 2：**\n>输入：`root = [1,1,1,1,null,null,1]`\n>\n>输出：`1`\n>\n>解释：以下是最佳的方案，如图所示\n![a4091b6448a0089b4d9e8f0390ff9ac6.gif](https://pic.leetcode-cn.com/1629356950-HZsKZC-a4091b6448a0089b4d9e8f0390ff9ac6.gif){:width=\"300px\"}\n\n**示例 3：**\n>输入：`root = [0,null,0]`\n>\n>输出：`0`\n>\n>解释：无需操作开关，当前所有节点上的灯均已关闭\n\n**提示：**\n- `1 <= 节点个数 <= 10^5`\n- `0 <= Node.val <= 1`",
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            "difficulty": "Medium",
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                    "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 Solution {\npublic:\n    int closeLampInTree(TreeNode* root) {\n\n    }\n};",
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                {
                    "lang": "Java",
                    "langSlug": "java",
                    "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 */\nclass Solution {\n    public int closeLampInTree(TreeNode root) {\n\n    }\n}",
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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\nclass Solution(object):\n    def closeLampInTree(self, root):\n        \"\"\"\n        :type root: TreeNode\n        :rtype: int\n        \"\"\"",
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                    "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\nclass Solution:\n    def closeLampInTree(self, root: TreeNode) -> int:",
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                {
                    "lang": "C",
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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\n\nint closeLampInTree(struct TreeNode* root){\n\n}",
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                    "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 Solution {\n    public int CloseLampInTree(TreeNode root) {\n\n    }\n}",
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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 * @param {TreeNode} root\n * @return {number}\n */\nvar closeLampInTree = function(root) {\n\n};",
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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# @param {TreeNode} root\n# @return {Integer}\ndef close_lamp_in_tree(root)\n\nend",
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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 */\nclass Solution {\n    func closeLampInTree(_ root: TreeNode?) -> Int {\n\n    }\n}",
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                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "/**\n * Definition for a binary tree node.\n * type TreeNode struct {\n *     Val int\n *     Left *TreeNode\n *     Right *TreeNode\n * }\n */\nfunc closeLampInTree(root *TreeNode) int {\n\n}",
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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 */\nobject Solution {\n    def closeLampInTree(root: TreeNode): Int = {\n\n    }\n}",
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                    "lang": "Kotlin",
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                    "code": "/**\n * Example:\n * var ti = TreeNode(5)\n * var v = ti.`val`\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 */\nclass Solution {\n    fun closeLampInTree(root: TreeNode?): Int {\n\n    }\n}",
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                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "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;\nimpl Solution {\n    pub fn close_lamp_in_tree(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {\n\n    }\n}",
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                    "lang": "PHP",
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                    "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 */\nclass Solution {\n\n    /**\n     * @param TreeNode $root\n     * @return Integer\n     */\n    function closeLampInTree($root) {\n\n    }\n}",
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                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "; Definition for a binary tree node.\n#|\n\n; val : integer?\n; left : (or/c tree-node? #f)\n; right : (or/c tree-node? #f)\n(struct tree-node\n  (val left right) #:mutable #:transparent)\n\n; constructor\n(define (make-tree-node [val 0])\n  (tree-node val #f #f))\n\n|#\n\n(define/contract (close-lamp-in-tree root)\n  (-> (or/c tree-node? #f) exact-integer?)\n\n  )",
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                    "lang": "Erlang",
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                    "code": "%% Definition for a binary tree node.\n%%\n%% -record(tree_node, {val = 0 :: integer(),\n%%                     left = null  :: 'null' | #tree_node{},\n%%                     right = null :: 'null' | #tree_node{}}).\n\n-spec close_lamp_in_tree(Root :: #tree_node{} | null) -> integer().\nclose_lamp_in_tree(Root) ->\n  .",
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                    "lang": "Elixir",
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                    "code": "# Definition for a binary tree node.\n#\n# defmodule TreeNode do\n#   @type t :: %__MODULE__{\n#           val: integer,\n#           left: TreeNode.t() | nil,\n#           right: TreeNode.t() | nil\n#         }\n#   defstruct val: 0, left: nil, right: nil\n# end\n\ndefmodule Solution do\n  @spec close_lamp_in_tree(root :: TreeNode.t | nil) :: integer\n  def close_lamp_in_tree(root) do\n\n  end\nend",
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