{ "data": { "question": { "questionId": "652", "questionFrontendId": "652", "categoryTitle": "Algorithms", "boundTopicId": 1713, "title": "Find Duplicate Subtrees", "titleSlug": "find-duplicate-subtrees", "content": "

Given the root of a binary tree, return all duplicate subtrees.

\n\n

For each kind of duplicate subtrees, you only need to return the root node of any one of them.

\n\n

Two trees are duplicate if they have the same structure with the same node values.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: root = [1,2,3,4,null,2,4,null,null,4]\nOutput: [[2,4],[4]]\n
\n\n

Example 2:

\n\"\"\n
\nInput: root = [2,1,1]\nOutput: [[1]]\n
\n\n

Example 3:

\n\"\"\n
\nInput: root = [2,2,2,3,null,3,null]\nOutput: [[2,3],[3]]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "寻找重复的子树", "translatedContent": "

给定一棵二叉树 root，返回所有重复的子树。

\n\n

对于同一类的重复子树，你只需要返回其中任意一棵的根结点即可。

\n\n

如果两棵树具有相同的结构和相同的结点值，则它们是重复的。

\n\n

 

\n\n

示例 1：

\n\n

\"\"

\n\n
\n输入：root = [1,2,3,4,null,2,4,null,null,4]\n输出：[[2,4],[4]]
\n\n

示例 2：

\n\n

\"\"

\n\n
\n输入：root = [2,1,1]\n输出：[[1]]
\n\n

示例 3：

\n\n

\"\"

\n\n
\n输入：root = [2,2,2,3,null,3,null]\n输出：[[2,3],[3]]
\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 {TreeNode} root\n * @return {TreeNode[]}\n */\nvar findDuplicateSubtrees = function(root) {\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 {TreeNode} root\n# @return {TreeNode[]}\ndef find_duplicate_subtrees(root)\n\nend", "__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 findDuplicateSubtrees(_ root: TreeNode?) -> [TreeNode?] {\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 findDuplicateSubtrees(root *TreeNode) []*TreeNode {\n\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 */\nobject Solution {\n def findDuplicateSubtrees(root: TreeNode): List[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 findDuplicateSubtrees(root: TreeNode?): List {\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 find_duplicate_subtrees(root: Option>>) -> Vec>>> {\n\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 TreeNode $root\n * @return TreeNode[]\n */\n function findDuplicateSubtrees($root) {\n\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 findDuplicateSubtrees(root: TreeNode | null): Array {\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 (find-duplicate-subtrees root)\n (-> (or/c tree-node? #f) (listof (or/c tree-node? #f)))\n\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 find_duplicate_subtrees(Root :: #tree_node{} | null) -> [#tree_node{} | null].\nfind_duplicate_subtrees(Root) ->\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 find_duplicate_subtrees(root :: TreeNode.t | nil) :: [TreeNode.t | nil]\n def find_duplicate_subtrees(root) do\n\n end\nend", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"48.4K\", \"totalSubmission\": \"83.6K\", \"totalAcceptedRaw\": 48444, \"totalSubmissionRaw\": 83624, \"acRate\": \"57.9%\"}", "hints": [], "solution": null, "status": null, "sampleTestCase": "[1,2,3,4,null,2,4,null,null,4]", "metaData": "{\r\n \"name\": \"findDuplicateSubtrees\",\r\n \"params\": [\r\n {\r\n \"name\": \"root\",\r\n \"type\": \"TreeNode\"\r\n }\r\n ],\r\n \"return\": {\r\n \"type\": \"list\"\r\n }\r\n}\r\n", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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Compile Options: --alwaysStrict --strictBindCallApply --strictFunctionTypes --target ES2020<\\/p>\"],\"racket\":[\"Racket\",\"
Racket CS<\\/a> v8.3<\\/p>\\r\\n\\r\\n
\\u4f7f\\u7528 #lang racket<\\/p>\\r\\n\\r\\n
\\u5df2\\u9884\\u5148 (require data\\/gvector data\\/queue data\\/order data\\/heap). \\u82e5\\u9700\\u4f7f\\u7528\\u5176\\u5b83\\u6570\\u636e\\u7ed3\\u6784\\uff0c\\u53ef\\u81ea\\u884c require\\u3002<\\/p>\"],\"erlang\":[\"Erlang\",\"Erlang\\/OTP 24.2\"],\"elixir\":[\"Elixir\",\"Elixir 1.13.0 with Erlang\\/OTP 24.2\"]}",
            "book": null,
            "isSubscribed": false,
            "isDailyQuestion": false,
            "dailyRecordStatus": null,
            "editorType": "CKEDITOR",
            "ugcQuestionId": null,
            "style": "LEETCODE",
            "exampleTestcases": "[1,2,3,4,null,2,4,null,null,4]\n[2,1,1]\n[2,2,2,3,null,3,null]",
            "__typename": "QuestionNode"
        }
    }
}