mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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201 lines
36 KiB
JSON
201 lines
36 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1387",
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"questionFrontendId": "1261",
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"categoryTitle": "Algorithms",
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"boundTopicId": 43340,
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"title": "Find Elements in a Contaminated Binary Tree",
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"titleSlug": "find-elements-in-a-contaminated-binary-tree",
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"content": "<p>Given a binary tree with the following rules:</p>\n\n<ol>\n\t<li><code>root.val == 0</code></li>\n\t<li>If <code>treeNode.val == x</code> and <code>treeNode.left != null</code>, then <code>treeNode.left.val == 2 * x + 1</code></li>\n\t<li>If <code>treeNode.val == x</code> and <code>treeNode.right != null</code>, then <code>treeNode.right.val == 2 * x + 2</code></li>\n</ol>\n\n<p>Now the binary tree is contaminated, which means all <code>treeNode.val</code> have been changed to <code>-1</code>.</p>\n\n<p>Implement the <code>FindElements</code> class:</p>\n\n<ul>\n\t<li><code>FindElements(TreeNode* root)</code> Initializes the object with a contaminated binary tree and recovers it.</li>\n\t<li><code>bool find(int target)</code> Returns <code>true</code> if the <code>target</code> value exists in the recovered binary tree.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/06/untitled-diagram-4-1.jpg\" style=\"width: 320px; height: 119px;\" />\n<pre>\n<strong>Input</strong>\n["FindElements","find","find"]\n[[[-1,null,-1]],[1],[2]]\n<strong>Output</strong>\n[null,false,true]\n<strong>Explanation</strong>\nFindElements findElements = new FindElements([-1,null,-1]); \nfindElements.find(1); // return False \nfindElements.find(2); // return True </pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/06/untitled-diagram-4.jpg\" style=\"width: 400px; height: 198px;\" />\n<pre>\n<strong>Input</strong>\n["FindElements","find","find","find"]\n[[[-1,-1,-1,-1,-1]],[1],[3],[5]]\n<strong>Output</strong>\n[null,true,true,false]\n<strong>Explanation</strong>\nFindElements findElements = new FindElements([-1,-1,-1,-1,-1]);\nfindElements.find(1); // return True\nfindElements.find(3); // return True\nfindElements.find(5); // return False</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/07/untitled-diagram-4-1-1.jpg\" style=\"width: 306px; height: 274px;\" />\n<pre>\n<strong>Input</strong>\n["FindElements","find","find","find","find"]\n[[[-1,null,-1,-1,null,-1]],[2],[3],[4],[5]]\n<strong>Output</strong>\n[null,true,false,false,true]\n<strong>Explanation</strong>\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</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>TreeNode.val == -1</code></li>\n\t<li>The height of the binary tree is less than or equal to <code>20</code></li>\n\t<li>The total number of nodes is between <code>[1, 10<sup>4</sup>]</code></li>\n\t<li>Total calls of <code>find()</code> is between <code>[1, 10<sup>4</sup>]</code></li>\n\t<li><code>0 <= target <= 10<sup>6</sup></code></li>\n</ul>\n",
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"translatedTitle": "在受污染的二叉树中查找元素",
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"translatedContent": "<p>给出一个满足下述规则的二叉树：</p>\n\n<ol>\n\t<li><code>root.val == 0</code></li>\n\t<li>如果 <code>treeNode.val == x</code> 且 <code>treeNode.left != null</code>，那么 <code>treeNode.left.val == 2 * x + 1</code></li>\n\t<li>如果 <code>treeNode.val == x</code> 且 <code>treeNode.right != null</code>，那么 <code>treeNode.right.val == 2 * x + 2</code></li>\n</ol>\n\n<p>现在这个二叉树受到「污染」，所有的 <code>treeNode.val</code> 都变成了 <code>-1</code>。</p>\n\n<p>请你先还原二叉树，然后实现 <code>FindElements</code> 类：</p>\n\n<ul>\n\t<li><code>FindElements(TreeNode* root)</code> 用受污染的二叉树初始化对象，你需要先把它还原。</li>\n\t<li><code>bool find(int target)</code> 判断目标值 <code>target</code> 是否存在于还原后的二叉树中并返回结果。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/11/16/untitled-diagram-4-1.jpg\" style=\"height: 119px; width: 320px;\"></strong></p>\n\n<pre><strong>输入：</strong>\n["FindElements","find","find"]\n[[[-1,null,-1]],[1],[2]]\n<strong>输出：</strong>\n[null,false,true]\n<strong>解释：</strong>\nFindElements findElements = new FindElements([-1,null,-1]); \nfindElements.find(1); // return False \nfindElements.find(2); // return True </pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/11/16/untitled-diagram-4.jpg\" style=\"height: 198px; width: 400px;\"></strong></p>\n\n<pre><strong>输入：</strong>\n["FindElements","find","find","find"]\n[[[-1,-1,-1,-1,-1]],[1],[3],[5]]\n<strong>输出：</strong>\n[null,true,true,false]\n<strong>解释：</strong>\nFindElements findElements = new FindElements([-1,-1,-1,-1,-1]);\nfindElements.find(1); // return True\nfindElements.find(3); // return True\nfindElements.find(5); // return False</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/11/16/untitled-diagram-4-1-1.jpg\" style=\"height: 274px; width: 306px;\"></strong></p>\n\n<pre><strong>输入：</strong>\n["FindElements","find","find","find","find"]\n[[[-1,null,-1,-1,null,-1]],[2],[3],[4],[5]]\n<strong>输出：</strong>\n[null,true,false,false,true]\n<strong>解释：</strong>\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</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>TreeNode.val == -1</code></li>\n\t<li>二叉树的高度不超过 <code>20</code></li>\n\t<li>节点的总数在 <code>[1, 10^4]</code> 之间</li>\n\t<li>调用 <code>find()</code> 的总次数在 <code>[1, 10^4]</code> 之间</li>\n\t<li><code>0 <= target <= 10^6</code></li>\n</ul>\n",
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"difficulty": "Medium",
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"langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"typescript\": false, \"bash\": false, \"php\": false, \"swift\": false, \"kotlin\": false, \"dart\": false, \"golang\": false, \"ruby\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"rust\": false, \"racket\": false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false}",
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"topicTags": [
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"name": "Tree",
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"name": "Breadth-First Search",
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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 * TreeNode *left;\n * TreeNode *right;\n * TreeNode() : val(0), left(nullptr), right(nullptr) {}\n * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}\n * TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}\n * };\n */\nclass FindElements {\npublic:\n FindElements(TreeNode* root) {\n\n }\n \n 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 */",
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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() {}\n * TreeNode(int val) { this.val = val; }\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 */",
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"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)",
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"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)",
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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\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*/",
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"langSlug": "csharp",
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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 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 */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "JavaScript",
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"langSlug": "javascript",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "PHP",
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"langSlug": "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 $right = null;\n * function __construct($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 */",
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},
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{
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"lang": "Swift",
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"langSlug": "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() { 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 */",
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"lang": "Kotlin",
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"langSlug": "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 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 */",
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},
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"lang": "Dart",
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"langSlug": "dart",
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"code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n * int val;\n * TreeNode? left;\n * TreeNode? right;\n * TreeNode([this.val = 0, this.left, this.right]);\n * }\n */\nclass FindElements {\n\n FindElements(TreeNode? root) {\n \n }\n \n bool find(int target) {\n \n }\n}\n\n/**\n * Your FindElements object will be instantiated and called as such:\n * FindElements obj = FindElements(root);\n * bool param1 = obj.find(target);\n */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Go",
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"langSlug": "golang",
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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 */\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 */",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Ruby",
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"langSlug": "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 = 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)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Scala",
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"langSlug": "scala",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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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// }\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<Rc<RefCell<TreeNode>>>) -> 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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Racket",
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"langSlug": "racket",
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"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;; 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))",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Erlang",
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"langSlug": "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 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.",
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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 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.",
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"hints": [
|
||
"Use DFS to traverse the binary tree and recover it.",
|
||
"Use a hashset to store TreeNode.val for finding."
|
||
],
|
||
"solution": null,
|
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