{ "data": { "question": { "questionId": "925", "questionFrontendId": "889", "categoryTitle": "Algorithms", "boundTopicId": 1681, "title": "Construct Binary Tree from Preorder and Postorder Traversal", "titleSlug": "construct-binary-tree-from-preorder-and-postorder-traversal", "content": "

Given two integer arrays, preorder and postorder where preorder is the preorder traversal of a binary tree of distinct values and postorder is the postorder traversal of the same tree, reconstruct and return the binary tree.

\n\n

If there exist multiple answers, you can return any of them.

\n\n

 

\n

Example 1:

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

Example 2:

\n\n
\nInput: preorder = [1], postorder = [1]\nOutput: [1]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "根据前序和后序遍历构造二叉树", "translatedContent": "

给定两个整数数组，preorder 和 postorder ，其中 preorder 是一个具有 无重复 值的二叉树的前序遍历，postorder 是同一棵树的后序遍历，重构并返回二叉树。

\n\n

如果存在多个答案，您可以返回其中 任何 一个。

\n\n

 

\n\n

示例 1：

\n\n

\n\n
\n输入：preorder = [1,2,4,5,3,6,7], postorder = [4,5,2,6,7,3,1]\n输出：[1,2,3,4,5,6,7]\n
\n\n

示例 2:

\n\n
\n输入: preorder = [1], postorder = [1]\n输出: [1]\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 {number[]} preorder\n * @param {number[]} postorder\n * @return {TreeNode}\n */\nvar constructFromPrePost = function(preorder, postorder) {\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 constructFromPrePost(preorder: number[], postorder: number[]): 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 Integer[] $preorder\n * @param Integer[] $postorder\n * @return TreeNode\n */\n function constructFromPrePost($preorder, $postorder) {\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 constructFromPrePost(_ preorder: [Int], _ postorder: [Int]) -> 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 constructFromPrePost(preorder: IntArray, postorder: IntArray): 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? constructFromPrePost(List preorder, List postorder) {\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 constructFromPrePost(preorder []int, postorder []int) *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 {Integer[]} preorder\n# @param {Integer[]} postorder\n# @return {TreeNode}\ndef construct_from_pre_post(preorder, postorder)\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 constructFromPrePost(preorder: Array[Int], postorder: Array[Int]): 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 construct_from_pre_post(preorder: Vec, postorder: Vec) -> 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 (construct-from-pre-post preorder postorder)\n (-> (listof exact-integer?) (listof exact-integer?) (or/c tree-node? #f))\n )", "__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 construct_from_pre_post(Preorder :: [integer()], Postorder :: [integer()]) -> #tree_node{} | null.\nconstruct_from_pre_post(Preorder, Postorder) ->\n .", "__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 Solution do\n @spec construct_from_pre_post(preorder :: [integer], postorder :: [integer]) :: TreeNode.t | nil\n def construct_from_pre_post(preorder, postorder) do\n \n end\nend", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"42.8K\", \"totalSubmission\": \"63.1K\", \"totalAcceptedRaw\": 42769, \"totalSubmissionRaw\": 63105, \"acRate\": \"67.8%\"}", "hints": [], "solution": { "id": "78", "canSeeDetail": true, "__typename": "ArticleNode" }, "status": null, "sampleTestCase": "[1,2,4,5,3,6,7]\n[4,5,2,6,7,3,1]", "metaData": "{\n \"name\": \"constructFromPrePost\",\n \"params\": [\n {\n \"name\": \"preorder\",\n \"type\": \"integer[]\"\n },\n {\n \"name\": \"postorder\",\n \"type\": \"integer[]\"\n }\n ],\n \"return\": {\n \"type\": \"TreeNode\"\n }\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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