{ "data": { "question": { "questionId": "1218", "questionFrontendId": "1123", "categoryTitle": "Algorithms", "boundTopicId": 13909, "title": "Lowest Common Ancestor of Deepest Leaves", "titleSlug": "lowest-common-ancestor-of-deepest-leaves", "content": "

Given the root of a binary tree, return the lowest common ancestor of its deepest leaves.

\n\n

Recall that:

\n\n\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: root = [3,5,1,6,2,0,8,null,null,7,4]\nOutput: [2,7,4]\nExplanation: We return the node with value 2, colored in yellow in the diagram.\nThe nodes coloured in blue are the deepest leaf-nodes of the tree.\nNote that nodes 6, 0, and 8 are also leaf nodes, but the depth of them is 2, but the depth of nodes 7 and 4 is 3.
\n\n

Example 2:

\n\n
\nInput: root = [1]\nOutput: [1]\nExplanation: The root is the deepest node in the tree, and it's the lca of itself.\n
\n\n

Example 3:

\n\n
\nInput: root = [0,1,3,null,2]\nOutput: [2]\nExplanation: The deepest leaf node in the tree is 2, the lca of one node is itself.\n
\n\n

 

\n

Constraints:

\n\n\n\n

 

\n

Note: This question is the same as 865: https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/

\n", "translatedTitle": "最深叶节点的最近公共祖先", "translatedContent": "

给你一个有根节点 root 的二叉树，返回它 最深的叶节点的最近公共祖先 。

\n\n

回想一下：

\n\n\n\n

 

\n\n

示例 1：

\n\"\"\n
\n输入：root = [3,5,1,6,2,0,8,null,null,7,4]\n输出：[2,7,4]\n解释：我们返回值为 2 的节点，在图中用黄色标记。\n在图中用蓝色标记的是树的最深的节点。\n注意，节点 6、0 和 8 也是叶节点，但是它们的深度是 2 ，而节点 7 和 4 的深度是 3 。\n
\n\n

示例 2：

\n\n
\n输入：root = [1]\n输出：[1]\n解释：根节点是树中最深的节点，它是它本身的最近公共祖先。\n
\n\n

示例 3：

\n\n
\n输入：root = [0,1,3,null,2]\n输出：[2]\n解释：树中最深的叶节点是 2 ，最近公共祖先是它自己。
\n\n

 

\n\n

提示：

\n\n\n\n

 

\n\n

注意：本题与力扣 865 重复：https://leetcode-cn.com/problems/smallest-subtree-with-all-the-deepest-nodes/

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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 lcaDeepestLeaves = 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 lca_deepest_leaves(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 lcaDeepestLeaves(_ 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 lcaDeepestLeaves(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 lcaDeepestLeaves(root: TreeNode): 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 lcaDeepestLeaves(root: TreeNode?): 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 lca_deepest_leaves(root: Option>>) -> Option>> {\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 $root\n * @return TreeNode\n */\n function lcaDeepestLeaves($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 lcaDeepestLeaves(root: TreeNode | null): TreeNode | null {\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 (lca-deepest-leaves root)\n (-> (or/c tree-node? #f) (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 lca_deepest_leaves(Root :: #tree_node{} | null) -> #tree_node{} | null.\nlca_deepest_leaves(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 lca_deepest_leaves(root :: TreeNode.t | nil) :: TreeNode.t | nil\n def lca_deepest_leaves(root) do\n\n end\nend", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"9.8K\", \"totalSubmission\": \"13.9K\", \"totalAcceptedRaw\": 9838, \"totalSubmissionRaw\": 13904, \"acRate\": \"70.8%\"}", "hints": [ "Do a postorder traversal.", "Then, if both subtrees contain a deepest leaf, you can mark this node as the answer (so far).", "The final node marked will be the correct answer." ], "solution": null, "status": null, "sampleTestCase": "[3,5,1,6,2,0,8,null,null,7,4]", "metaData": "{\n \"name\": \"lcaDeepestLeaves\",\n \"params\": [\n {\n \"name\": \"root\",\n \"type\": \"TreeNode\"\n }\n ],\n \"return\": {\n \"type\": \"TreeNode\"\n }\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\"]}",
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