{ "data": { "question": { "questionId": "774", "questionFrontendId": "559", "boundTopicId": null, "title": "Maximum Depth of N-ary Tree", "titleSlug": "maximum-depth-of-n-ary-tree", "content": "

Given a n-ary tree, find its maximum depth.

\n\n

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

\n\n

Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples).

\n\n

 

\n

Example 1:

\n\n

\n\n
\nInput: root = [1,null,3,2,4,null,5,6]\nOutput: 3\n
\n\n

Example 2:

\n\n

\"\"

\n\n
\nInput: root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]\nOutput: 5\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": null, "translatedContent": null, "isPaidOnly": false, "difficulty": "Easy", "likes": 1964, "dislikes": 70, "isLiked": null, "similarQuestions": "[{\"title\": \"Maximum Depth of Binary Tree\", \"titleSlug\": \"maximum-depth-of-binary-tree\", \"difficulty\": \"Easy\", \"translatedTitle\": null}, {\"title\": \"The Time When the Network Becomes Idle\", \"titleSlug\": \"the-time-when-the-network-becomes-idle\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]", "exampleTestcases": "[1,null,3,2,4,null,5,6]\n[1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]", "categoryTitle": "Algorithms", "contributors": [], "topicTags": [ { "name": "Tree", "slug": "tree", "translatedName": null, "__typename": "TopicTagNode" }, { "name": "Depth-First Search", "slug": "depth-first-search", "translatedName": null, "__typename": "TopicTagNode" }, { "name": "Breadth-First Search", "slug": "breadth-first-search", "translatedName": null, "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "/*\n// Definition for a Node.\nclass Node {\npublic:\n int val;\n vector children;\n\n Node() {}\n\n Node(int _val) {\n val = _val;\n }\n\n Node(int _val, vector _children) {\n val = _val;\n children = _children;\n }\n};\n*/\n\nclass Solution {\npublic:\n int maxDepth(Node* root) {\n \n }\n};", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "/*\n// Definition for a Node.\nclass Node {\n public int val;\n public List children;\n\n public Node() {}\n\n public Node(int _val) {\n val = _val;\n }\n\n public Node(int _val, List _children) {\n val = _val;\n children = _children;\n }\n};\n*/\n\nclass Solution {\n public int maxDepth(Node root) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "\"\"\"\n# Definition for a Node.\nclass Node(object):\n def __init__(self, val=None, children=None):\n self.val = val\n self.children = children\n\"\"\"\n\nclass Solution(object):\n def maxDepth(self, root):\n \"\"\"\n :type root: Node\n :rtype: int\n \"\"\"\n ", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "\"\"\"\n# Definition for a Node.\nclass Node:\n def __init__(self, val=None, children=None):\n self.val = val\n self.children = children\n\"\"\"\n\nclass Solution:\n def maxDepth(self, root: 'Node') -> int:\n ", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "/**\n * Definition for a Node.\n * struct Node {\n * int val;\n * int numChildren;\n * struct Node** children;\n * };\n */\n\nint maxDepth(struct Node* root) {\n \n}", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "/*\n// Definition for a Node.\npublic class Node {\n public int val;\n public IList children;\n\n public Node() {}\n\n public Node(int _val) {\n val = _val;\n }\n\n public Node(int _val, IList _children) {\n val = _val;\n children = _children;\n }\n}\n*/\n\npublic class Solution {\n public int MaxDepth(Node root) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * // Definition for a Node.\n * function Node(val,children) {\n * this.val = val;\n * this.children = children;\n * };\n */\n\n/**\n * @param {Node|null} root\n * @return {number}\n */\nvar maxDepth = function(root) {\n \n};", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# Definition for a Node.\n# class Node\n# attr_accessor :val, :children\n# def initialize(val)\n# @val = val\n# @children = []\n# end\n# end\n\n# @param {Node} root\n# @return {int}\ndef maxDepth(root)\n \nend", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "/**\n * Definition for a Node.\n * public class Node {\n * public var val: Int\n * public var children: [Node]\n * public init(_ val: Int) {\n * self.val = val\n * self.children = []\n * }\n * }\n */\n\nclass Solution {\n func maxDepth(_ root: Node?) -> Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "/**\n * Definition for a Node.\n * type Node struct {\n * Val int\n * Children []*Node\n * }\n */\n\nfunc maxDepth(root *Node) int {\n \n}", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "/**\n * Definition for a Node.\n * class Node(var _value: Int) {\n * var value: Int = _value\n * var children: List[Node] = List()\n * }\n */\n\nobject Solution {\n def maxDepth(root: Node): Int = {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "/**\n * Definition for a Node.\n * class Node(var `val`: Int) {\n * var children: List = listOf()\n * }\n */\n\nclass Solution {\n fun maxDepth(root: Node?): Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "/**\n * Definition for a Node.\n * class Node {\n * public $val = null;\n * public $children = null;\n * function __construct($val = 0) {\n * $this->val = $val;\n * $this->children = array();\n * }\n * }\n */\n\nclass Solution {\n /**\n * @param Node $root\n * @return integer\n */\n function maxDepth($root) {\n \t\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "/**\n * Definition for Node.\n * class Node {\n * val: number\n * children: Node[]\n * constructor(val?: number, children?: Node[]) {\n * this.val = (val===undefined ? 0 : val)\n * this.children = (children===undefined ? [] : children)\n * }\n * }\n */\n\nfunction maxDepth(root: Node | null): number {\n \n};", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"208.3K\", \"totalSubmission\": \"293.3K\", \"totalAcceptedRaw\": 208320, \"totalSubmissionRaw\": 293335, \"acRate\": \"71.0%\"}", "hints": [], "solution": { "id": "576", "canSeeDetail": false, "paidOnly": true, "hasVideoSolution": false, "paidOnlyVideo": true, "__typename": "ArticleNode" }, "status": null, "sampleTestCase": "[1,null,3,2,4,null,5,6]", "metaData": "{\n \"name\": \"maxDepth\",\n \"params\": [\n {\n \"name\": \"root\",\n \"type\": \"integer\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n },\n \"languages\": [\n \"cpp\",\n \"java\",\n \"python\",\n \"csharp\",\n \"javascript\",\n \"python3\",\n \"golang\",\n \"ruby\",\n \"c\",\n \"kotlin\",\n \"scala\",\n \"php\",\n \"swift\",\n \"typescript\"\n ],\n \"manual\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "enableTestMode": false, "enableDebugger": true, "envInfo": "{\"cpp\": [\"C++\", \"

Compiled with clang 11 using the latest C++ 17 standard.

\\r\\n\\r\\n

Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

\\r\\n\\r\\n

Most standard library headers are already included automatically for your convenience.

\"], \"java\": [\"Java\", \"

OpenJDK 17 . Java 8 features such as lambda expressions and stream API can be used.

\\r\\n\\r\\n

Most standard library headers are already included automatically for your convenience.

\\r\\n

Includes Pair class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.

\"], \"python\": [\"Python\", \"

Python 2.7.12.

\\r\\n\\r\\n

Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

\\r\\n\\r\\n

For Map/TreeMap data structure, you may use sortedcontainers library.

\\r\\n\\r\\n

Note that Python 2.7 will not be maintained past 2020. For the latest Python, please choose Python3 instead.

\"], \"c\": [\"C\", \"

Compiled with gcc 8.2 using the gnu99 standard.

\\r\\n\\r\\n

Your code is compiled with level one optimization (-O1). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

\\r\\n\\r\\n

Most standard library headers are already included automatically for your convenience.

\\r\\n\\r\\n

For hash table operations, you may use uthash. \\\"uthash.h\\\" is included by default. Below are some examples:

\\r\\n\\r\\n

1. Adding an item to a hash.\\r\\n

\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n
\\r\\n

\\r\\n\\r\\n

2. Looking up an item in a hash:\\r\\n

\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n
\\r\\n

\\r\\n\\r\\n

3. Deleting an item in a hash:\\r\\n

\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n
\\r\\n

\"], \"csharp\": [\"C#\", \"

C# 10 with .NET 6 runtime

\\r\\n\\r\\n

Your code is compiled with debug flag enabled (/debug).

\"], \"javascript\": [\"JavaScript\", \"

Node.js 16.13.2.

\\r\\n\\r\\n

Your code is run with --harmony flag, enabling new ES6 features.

\\r\\n\\r\\n

lodash.js library is included by default.

\\r\\n\\r\\n

For Priority Queue / Queue data structures, you may use datastructures-js/priority-queue and datastructures-js/queue.

\"], \"ruby\": [\"Ruby\", \"

Ruby 3.1

\\r\\n\\r\\n

Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms

\"], \"swift\": [\"Swift\", \"

Swift 5.5.2.

\"], \"golang\": [\"Go\", \"

Go 1.17.6.

\\r\\n\\r\\n

Support https://godoc.org/github.com/emirpasic/gods library.

\"], \"python3\": [\"Python3\", \"

Python 3.10.

\\r\\n\\r\\n

Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

\\r\\n\\r\\n

For Map/TreeMap data structure, you may use sortedcontainers library.

\"], \"scala\": [\"Scala\", \"

Scala 2.13.7.

\"], \"kotlin\": [\"Kotlin\", \"

Kotlin 1.3.10.

\"], \"php\": [\"PHP\", \"

PHP 8.1.

\\r\\n

With bcmath module

\"], \"typescript\": [\"Typescript\", \"

TypeScript 4.5.4, Node.js 16.13.2.

\\r\\n\\r\\n

Your code is run with --harmony flag, enabling new ES2020 features.

\\r\\n\\r\\n

lodash.js library is included by default.

\"]}", "libraryUrl": null, "adminUrl": null, "challengeQuestion": null, "__typename": "QuestionNode" } } }