{ "data": { "question": { "questionId": "208", "questionFrontendId": "208", "categoryTitle": "Algorithms", "boundTopicId": 1220, "title": "Implement Trie (Prefix Tree)", "titleSlug": "implement-trie-prefix-tree", "content": "

A trie (pronounced as "try") or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various applications of this data structure, such as autocomplete and spellchecker.

\n\n

Implement the Trie class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["Trie", "insert", "search", "search", "startsWith", "insert", "search"]\n[[], ["apple"], ["apple"], ["app"], ["app"], ["app"], ["app"]]\nOutput\n[null, null, true, false, true, null, true]\n\nExplanation\nTrie trie = new Trie();\ntrie.insert("apple");\ntrie.search("apple");   // return True\ntrie.search("app");     // return False\ntrie.startsWith("app"); // return True\ntrie.insert("app");\ntrie.search("app");     // return True\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "实现 Trie (前缀树)", "translatedContent": "

Trie（发音类似 \"try\"）或者说 前缀树 是一种树形数据结构，用于高效地存储和检索字符串数据集中的键。这一数据结构有相当多的应用情景，例如自动补完和拼写检查。

\n\n

请你实现 Trie 类：

\n\n\n\n

 

\n\n

示例：

\n\n
\n输入\n[\"Trie\", \"insert\", \"search\", \"search\", \"startsWith\", \"insert\", \"search\"]\n[[], [\"apple\"], [\"apple\"], [\"app\"], [\"app\"], [\"app\"], [\"app\"]]\n输出\n[null, null, true, false, true, null, true]\n\n解释\nTrie trie = new Trie();\ntrie.insert(\"apple\");\ntrie.search(\"apple\");   // 返回 True\ntrie.search(\"app\");     // 返回 False\ntrie.startsWith(\"app\"); // 返回 True\ntrie.insert(\"app\");\ntrie.search(\"app\");     // 返回 True\n
\n\n

 

\n\n

提示：

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"langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"ruby\": false, \"bash\": false, \"swift\": false, \"golang\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"kotlin\": false, \"rust\": false, \"php\": false, \"typescript\": false, \"racket\": false, \"erlang\": false, \"elixir\": false}", "topicTags": [ { "name": "Design", "slug": "design", "translatedName": "设计", "__typename": "TopicTagNode" }, { "name": "Trie", "slug": "trie", "translatedName": "字典树", "__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": "哈希表", "__typename": "TopicTagNode" }, { "name": "String", "slug": "string", "translatedName": "字符串", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Trie {\npublic:\n Trie() {\n\n }\n \n void insert(string word) {\n\n }\n \n bool search(string word) {\n\n }\n \n bool startsWith(string prefix) {\n\n }\n};\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie* obj = new Trie();\n * obj->insert(word);\n * bool param_2 = obj->search(word);\n * bool param_3 = obj->startsWith(prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class Trie {\n\n public Trie() {\n\n }\n \n public void insert(String word) {\n\n }\n \n public boolean search(String word) {\n\n }\n \n public boolean startsWith(String prefix) {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie obj = new Trie();\n * obj.insert(word);\n * boolean param_2 = obj.search(word);\n * boolean param_3 = obj.startsWith(prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class Trie(object):\n\n def __init__(self):\n\n\n def insert(self, word):\n \"\"\"\n :type word: str\n :rtype: None\n \"\"\"\n\n\n def search(self, word):\n \"\"\"\n :type word: str\n :rtype: bool\n \"\"\"\n\n\n def startsWith(self, prefix):\n \"\"\"\n :type prefix: str\n :rtype: bool\n \"\"\"\n\n\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.startsWith(prefix)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class Trie:\n\n def __init__(self):\n\n\n def insert(self, word: str) -> None:\n\n\n def search(self, word: str) -> bool:\n\n\n def startsWith(self, prefix: str) -> bool:\n\n\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.startsWith(prefix)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} Trie;\n\n\nTrie* trieCreate() {\n \n}\n\nvoid trieInsert(Trie* obj, char * word) {\n \n}\n\nbool trieSearch(Trie* obj, char * word) {\n \n}\n\nbool trieStartsWith(Trie* obj, char * prefix) {\n \n}\n\nvoid trieFree(Trie* obj) {\n \n}\n\n/**\n * Your Trie struct will be instantiated and called as such:\n * Trie* obj = trieCreate();\n * trieInsert(obj, word);\n \n * bool param_2 = trieSearch(obj, word);\n \n * bool param_3 = trieStartsWith(obj, prefix);\n \n * trieFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Trie {\n\n public Trie() {\n\n }\n \n public void Insert(string word) {\n\n }\n \n public bool Search(string word) {\n\n }\n \n public bool StartsWith(string prefix) {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie obj = new Trie();\n * obj.Insert(word);\n * bool param_2 = obj.Search(word);\n * bool param_3 = obj.StartsWith(prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar Trie = function() {\n\n};\n\n/** \n * @param {string} word\n * @return {void}\n */\nTrie.prototype.insert = function(word) {\n\n};\n\n/** \n * @param {string} word\n * @return {boolean}\n */\nTrie.prototype.search = function(word) {\n\n};\n\n/** \n * @param {string} prefix\n * @return {boolean}\n */\nTrie.prototype.startsWith = function(prefix) {\n\n};\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class Trie\n def initialize()\n\n end\n\n\n=begin\n :type word: String\n :rtype: Void\n=end\n def insert(word)\n\n end\n\n\n=begin\n :type word: String\n :rtype: Boolean\n=end\n def search(word)\n\n end\n\n\n=begin\n :type prefix: String\n :rtype: Boolean\n=end\n def starts_with(prefix)\n\n end\n\n\nend\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie.new()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.starts_with(prefix)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass Trie {\n\n init() {\n\n }\n \n func insert(_ word: String) {\n\n }\n \n func search(_ word: String) -> Bool {\n\n }\n \n func startsWith(_ prefix: String) -> Bool {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * let obj = Trie()\n * obj.insert(word)\n * let ret_2: Bool = obj.search(word)\n * let ret_3: Bool = obj.startsWith(prefix)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type Trie struct {\n\n}\n\n\nfunc Constructor() Trie {\n\n}\n\n\nfunc (this *Trie) Insert(word string) {\n\n}\n\n\nfunc (this *Trie) Search(word string) bool {\n\n}\n\n\nfunc (this *Trie) StartsWith(prefix string) bool {\n\n}\n\n\n/**\n * Your Trie object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Insert(word);\n * param_2 := obj.Search(word);\n * param_3 := obj.StartsWith(prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class Trie() {\n\n def insert(word: String) {\n\n }\n\n def search(word: String): Boolean = {\n\n }\n\n def startsWith(prefix: String): Boolean = {\n\n }\n\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Trie() {\n\n fun insert(word: String) {\n\n }\n\n fun search(word: String): Boolean {\n\n }\n\n fun startsWith(prefix: String): Boolean {\n\n }\n\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct Trie {\n\n}\n\n\n/**\n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Trie {\n\n fn new() -> Self {\n\n }\n \n fn insert(&self, word: String) {\n\n }\n \n fn search(&self, word: String) -> bool {\n\n }\n \n fn starts_with(&self, prefix: String) -> bool {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * let obj = Trie::new();\n * obj.insert(word);\n * let ret_2: bool = obj.search(word);\n * let ret_3: bool = obj.starts_with(prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Trie {\n /**\n */\n function __construct() {\n\n }\n\n /**\n * @param String $word\n * @return NULL\n */\n function insert($word) {\n\n }\n\n /**\n * @param String $word\n * @return Boolean\n */\n function search($word) {\n\n }\n\n /**\n * @param String $prefix\n * @return Boolean\n */\n function startsWith($prefix) {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * $obj = Trie();\n * $obj->insert($word);\n * $ret_2 = $obj->search($word);\n * $ret_3 = $obj->startsWith($prefix);\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class Trie {\n constructor() {\n\n }\n\n insert(word: string): void {\n\n }\n\n search(word: string): boolean {\n\n }\n\n startsWith(prefix: string): boolean {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define trie%\n (class object%\n (super-new)\n (init-field)\n \n ; insert : string? -> void?\n (define/public (insert word)\n\n )\n ; search : string? -> boolean?\n (define/public (search word)\n\n )\n ; starts-with : string? -> boolean?\n (define/public (starts-with prefix)\n\n )))\n\n;; Your trie% object will be instantiated and called as such:\n;; (define obj (new trie%))\n;; (send obj insert word)\n;; (define param_2 (send obj search word))\n;; (define param_3 (send obj starts-with prefix))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec trie_init_() -> any().\ntrie_init_() ->\n .\n\n-spec trie_insert(Word :: unicode:unicode_binary()) -> any().\ntrie_insert(Word) ->\n .\n\n-spec trie_search(Word :: unicode:unicode_binary()) -> boolean().\ntrie_search(Word) ->\n .\n\n-spec trie_starts_with(Prefix :: unicode:unicode_binary()) -> boolean().\ntrie_starts_with(Prefix) ->\n .\n\n\n%% Your functions will be called as such:\n%% trie_init_(),\n%% trie_insert(Word),\n%% Param_2 = trie_search(Word),\n%% Param_3 = trie_starts_with(Prefix),\n\n%% trie_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": 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