{ "data": { "question": { "questionId": "1387", "questionFrontendId": "1261", "categoryTitle": "Algorithms", "boundTopicId": 43340, "title": "Find Elements in a Contaminated Binary Tree", "titleSlug": "find-elements-in-a-contaminated-binary-tree", "content": "

Given a binary tree with the following rules:

\n\n
    \n\t
  1. root.val == 0
    2. \n\t
  2. If treeNode.val == x and treeNode.left != null, then treeNode.left.val == 2 * x + 1
    3. \n\t
  3. If treeNode.val == x and treeNode.right != null, then treeNode.right.val == 2 * x + 2
    4. \n
\n\n

Now the binary tree is contaminated, which means all treeNode.val have been changed to -1.

\n\n

Implement the FindElements class:

\n\n\n\n

 

\n

Example 1:

\n\"\"\n
\nInput\n["FindElements","find","find"]\n[[[-1,null,-1]],[1],[2]]\nOutput\n[null,false,true]\nExplanation\nFindElements findElements = new FindElements([-1,null,-1]); \nfindElements.find(1); // return False \nfindElements.find(2); // return True
\n\n

Example 2:

\n\"\"\n
\nInput\n["FindElements","find","find","find"]\n[[[-1,-1,-1,-1,-1]],[1],[3],[5]]\nOutput\n[null,true,true,false]\nExplanation\nFindElements findElements = new FindElements([-1,-1,-1,-1,-1]);\nfindElements.find(1); // return True\nfindElements.find(3); // return True\nfindElements.find(5); // return False
\n\n

Example 3:

\n\"\"\n
\nInput\n["FindElements","find","find","find","find"]\n[[[-1,null,-1,-1,null,-1]],[2],[3],[4],[5]]\nOutput\n[null,true,false,false,true]\nExplanation\nFindElements findElements = new FindElements([-1,null,-1,-1,null,-1]);\nfindElements.find(2); // return True\nfindElements.find(3); // return False\nfindElements.find(4); // return False\nfindElements.find(5); // return True\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "在受污染的二叉树中查找元素", "translatedContent": "

给出一个满足下述规则的二叉树：

\n\n
    \n\t
  1. root.val == 0
    2. \n\t
  2. 如果 treeNode.val == x 且 treeNode.left != null，那么 treeNode.left.val == 2 * x + 1
    3. \n\t
  3. 如果 treeNode.val == x 且 treeNode.right != null，那么 treeNode.right.val == 2 * x + 2
    4. \n
\n\n

现在这个二叉树受到「污染」，所有的 treeNode.val 都变成了 -1。

\n\n

请你先还原二叉树，然后实现 FindElements 类：

\n\n\n\n

 

\n\n

示例 1：

\n\n

\"\"

\n\n
输入：\n["FindElements","find","find"]\n[[[-1,null,-1]],[1],[2]]\n输出：\n[null,false,true]\n解释：\nFindElements findElements = new FindElements([-1,null,-1]); \nfindElements.find(1); // return False \nfindElements.find(2); // return True
\n\n

示例 2：

\n\n

\"\"

\n\n
输入：\n["FindElements","find","find","find"]\n[[[-1,-1,-1,-1,-1]],[1],[3],[5]]\n输出：\n[null,true,true,false]\n解释：\nFindElements findElements = new FindElements([-1,-1,-1,-1,-1]);\nfindElements.find(1); // return True\nfindElements.find(3); // return True\nfindElements.find(5); // return False
\n\n

示例 3：

\n\n

\"\"

\n\n
输入：\n["FindElements","find","find","find","find"]\n[[[-1,null,-1,-1,null,-1]],[2],[3],[4],[5]]\n输出：\n[null,true,false,false,true]\n解释：\nFindElements findElements = new FindElements([-1,null,-1,-1,null,-1]);\nfindElements.find(2); // return True\nfindElements.find(3); // return False\nfindElements.find(4); // return False\nfindElements.find(5); // return True\n
\n\n

 

\n\n

提示：

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}\n * TreeNode(int val, TreeNode left, TreeNode right) {\n * this.val = val;\n * this.left = left;\n * this.right = right;\n * }\n * }\n */\nclass FindElements {\n\n public FindElements(TreeNode root) {\n\n }\n \n public boolean find(int target) {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * FindElements obj = new FindElements(root);\n * boolean param_1 = obj.find(target);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "# Definition for a binary tree node.\n# class TreeNode(object):\n# def __init__(self, val=0, left=None, right=None):\n# self.val = val\n# self.left = left\n# self.right = right\nclass FindElements(object):\n\n def __init__(self, root):\n \"\"\"\n :type root: TreeNode\n \"\"\"\n \n\n def find(self, target):\n \"\"\"\n :type target: int\n :rtype: bool\n \"\"\"\n \n\n\n# Your FindElements object will be instantiated and called as such:\n# obj = FindElements(root)\n# param_1 = obj.find(target)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "# Definition for a binary tree node.\n# class TreeNode:\n# def __init__(self, val=0, left=None, right=None):\n# self.val = val\n# self.left = left\n# self.right = right\nclass FindElements:\n\n def __init__(self, root: Optional[TreeNode]):\n\n\n def find(self, target: int) -> bool:\n\n\n\n# Your FindElements object will be instantiated and called as such:\n# obj = FindElements(root)\n# param_1 = obj.find(target)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "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\n\ntypedef struct {\n\n} FindElements;\n\n\nFindElements* findElementsCreate(struct TreeNode* root) {\n\n}\n\nbool findElementsFind(FindElements* obj, int target) {\n\n}\n\nvoid findElementsFree(FindElements* obj) {\n\n}\n\n/**\n * Your FindElements struct will be instantiated and called as such:\n * FindElements* obj = findElementsCreate(root);\n * bool param_1 = findElementsFind(obj, target);\n \n * findElementsFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "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 val=0, TreeNode left=null, TreeNode right=null) {\n * this.val = val;\n * this.left = left;\n * this.right = right;\n * }\n * }\n */\npublic class FindElements {\n\n public FindElements(TreeNode root) {\n\n }\n \n public bool Find(int target) {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * FindElements obj = new FindElements(root);\n * bool param_1 = obj.Find(target);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * Definition for a binary tree node.\n * function TreeNode(val, left, right) {\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 * @param {TreeNode} root\n */\nvar FindElements = function(root) {\n\n};\n\n/** \n * @param {number} target\n * @return {boolean}\n */\nFindElements.prototype.find = function(target) {\n\n};\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * var obj = new FindElements(root)\n * var param_1 = obj.find(target)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# Definition for a binary tree node.\n# class TreeNode\n# attr_accessor :val, :left, :right\n# def initialize(val = 0, left = nil, right = nil)\n# @val = val\n# @left = left\n# @right = right\n# end\n# end\nclass FindElements\n\n=begin\n :type root: TreeNode\n=end\n def initialize(root)\n\n end\n\n\n=begin\n :type target: Integer\n :rtype: Boolean\n=end\n def find(target)\n\n end\n\n\nend\n\n# Your FindElements object will be instantiated and called as such:\n# obj = FindElements.new(root)\n# param_1 = obj.find(target)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "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() { self.val = 0; self.left = nil; self.right = nil; }\n * public init(_ val: Int) { self.val = val; self.left = nil; self.right = nil; }\n * public init(_ val: Int, _ left: TreeNode?, _ right: TreeNode?) {\n * self.val = val\n * self.left = left\n * self.right = right\n * }\n * }\n */\n\nclass FindElements {\n\n init(_ root: TreeNode?) {\n\n }\n \n func find(_ target: Int) -> Bool {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * let obj = FindElements(root)\n * let ret_1: Bool = obj.find(target)\n */", "__typename": "CodeSnippetNode" }, { "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 */\ntype FindElements struct {\n\n}\n\n\nfunc Constructor(root *TreeNode) FindElements {\n\n}\n\n\nfunc (this *FindElements) Find(target int) bool {\n\n}\n\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * obj := Constructor(root);\n * param_1 := obj.Find(target);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode(_value: Int = 0, _left: TreeNode = null, _right: TreeNode = null) {\n * var value: Int = _value\n * var left: TreeNode = _left\n * var right: TreeNode = _right\n * }\n */\nclass FindElements(_root: TreeNode) {\n\n def find(target: Int): Boolean = {\n\n }\n\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * var obj = new FindElements(root)\n * var param_1 = obj.find(target)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "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 FindElements(root: TreeNode?) {\n\n fun find(target: Int): Boolean {\n\n }\n\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * var obj = FindElements(root)\n * var param_1 = obj.find(target)\n */", "__typename": "CodeSnippetNode" }, { "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>>,\n// pub right: Option>>,\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// }\nstruct FindElements {\n\n}\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 FindElements {\n\n fn new(root: Option>>) -> Self {\n\n }\n \n fn find(&self, target: i32) -> bool {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * let obj = FindElements::new(root);\n * let ret_1: bool = obj.find(target);\n */", "__typename": "CodeSnippetNode" }, { "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 $right = null;\n * function __construct($val = 0, $left = null, $right = null) {\n * $this->val = $val;\n * $this->left = $left;\n * $this->right = $right;\n * }\n * }\n */\nclass FindElements {\n /**\n * @param TreeNode $root\n */\n function __construct($root) {\n\n }\n\n /**\n * @param Integer $target\n * @return Boolean\n */\n function find($target) {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * $obj = FindElements($root);\n * $ret_1 = $obj->find($target);\n */", "__typename": "CodeSnippetNode" }, { "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\nclass FindElements {\n constructor(root: TreeNode | null) {\n\n }\n\n find(target: number): boolean {\n\n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * var obj = new FindElements(root)\n * var param_1 = obj.find(target)\n */", "__typename": "CodeSnippetNode" }, { "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 find-elements%\n (class object%\n (super-new)\n\n ; root : (or/c tree-node? #f)\n (init-field\n root)\n \n ; find : exact-integer? -> boolean?\n (define/public (find target)\n\n )))\n\n;; Your find-elements% object will be instantiated and called as such:\n;; (define obj (new find-elements% [root root]))\n;; (define param_1 (send obj find target))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "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 find_elements_init_(Root :: #tree_node{} | null) -> any().\nfind_elements_init_(Root) ->\n .\n\n-spec find_elements_find(Target :: integer()) -> boolean().\nfind_elements_find(Target) ->\n .\n\n\n%% Your functions will be called as such:\n%% find_elements_init_(Root),\n%% Param_1 = find_elements_find(Target),\n\n%% find_elements_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "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 FindElements do\n @spec init_(root :: TreeNode.t | nil) :: any\n def init_(root) do\n\n end\n\n @spec find(target :: integer) :: boolean\n def find(target) do\n\n end\nend\n\n# Your functions will be called as such:\n# FindElements.init_(root)\n# param_1 = FindElements.find(target)\n\n# FindElements.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"9.2K\", \"totalSubmission\": \"12.6K\", \"totalAcceptedRaw\": 9183, \"totalSubmissionRaw\": 12551, \"acRate\": \"73.2%\"}", "hints": [ "Use DFS to traverse the binary tree and recover it.", "Use a hashset to store TreeNode.val for finding." ], "solution": null, "status": null, "sampleTestCase": "[\"FindElements\",\"find\",\"find\"]\n[[[-1,null,-1]],[1],[2]]", "metaData": "{\n \"classname\": \"FindElements\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"TreeNode\",\n \"name\": \"root\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"target\"\n }\n ],\n \"name\": \"find\",\n \"return\": {\n \"type\": \"boolean\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true,\n \"manual\": false\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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