{ "data": { "question": { "questionId": "1093", "questionFrontendId": "1028", "categoryTitle": "Algorithms", "boundTopicId": 3649, "title": "Recover a Tree From Preorder Traversal", "titleSlug": "recover-a-tree-from-preorder-traversal", "content": "

We run a preorder depth-first search (DFS) on the root of a binary tree.

\n\n

At each node in this traversal, we output D dashes (where D is the depth of this node), then we output the value of this node.  If the depth of a node is D, the depth of its immediate child is D + 1.  The depth of the root node is 0.

\n\n

If a node has only one child, that child is guaranteed to be the left child.

\n\n

Given the output traversal of this traversal, recover the tree and return its root.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: traversal = "1-2--3--4-5--6--7"\nOutput: [1,2,5,3,4,6,7]\n
\n\n

Example 2:

\n\"\"\n
\nInput: traversal = "1-2--3---4-5--6---7"\nOutput: [1,2,5,3,null,6,null,4,null,7]\n
\n\n

Example 3:

\n\"\"\n
\nInput: traversal = "1-401--349---90--88"\nOutput: [1,401,null,349,88,90]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "从先序遍历还原二叉树", "translatedContent": "

我们从二叉树的根节点 root 开始进行深度优先搜索。

\n\n

在遍历中的每个节点处,我们输出 D 条短划线(其中 D 是该节点的深度),然后输出该节点的值。(如果节点的深度为 D,则其直接子节点的深度为 D + 1。根节点的深度为 0)。

\n\n

如果节点只有一个子节点,那么保证该子节点为左子节点。

\n\n

给出遍历输出 S,还原树并返回其根节点 root

\n\n

 

\n\n

示例 1:

\n\n

\"\"

\n\n
输入:"1-2--3--4-5--6--7"\n输出:[1,2,5,3,4,6,7]\n
\n\n

示例 2:

\n\n

\"\"

\n\n
输入:"1-2--3---4-5--6---7"\n输出:[1,2,5,3,null,6,null,4,null,7]\n
\n\n

示例 3:

\n\n

\"\"

\n\n
输入:"1-401--349---90--88"\n输出:[1,401,null,349,88,90]\n
\n\n

 

\n\n

提示:

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0 : val)\n * this.left = (left===undefined ? null : left)\n * this.right = (right===undefined ? null : right)\n * }\n */\n/**\n * @param {string} traversal\n * @return {TreeNode}\n */\nvar recoverFromPreorder = function(traversal) {\n\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\nfunction recoverFromPreorder(traversal: string): TreeNode | null {\n \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 Solution {\n\n /**\n * @param String $traversal\n * @return TreeNode\n */\n function recoverFromPreorder($traversal) {\n\n }\n}", "__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 */\nclass Solution {\n func recoverFromPreorder(_ traversal: String) -> TreeNode? {\n\n }\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 Solution {\n fun recoverFromPreorder(traversal: String): TreeNode? {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "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 Solution {\n TreeNode? recoverFromPreorder(String traversal) {\n \n }\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 */\nfunc recoverFromPreorder(traversal string) *TreeNode {\n\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\n# @param {String} traversal\n# @return {TreeNode}\ndef recover_from_preorder(traversal)\n\nend", "__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 */\nobject Solution {\n def recoverFromPreorder(traversal: String): TreeNode = {\n\n }\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// }\nuse std::rc::Rc;\nuse std::cell::RefCell;\nimpl Solution {\n pub fn recover_from_preorder(traversal: String) -> Option>> {\n\n }\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/contract (recover-from-preorder traversal)\n (-> string? 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