{ "data": { "question": { "questionId": "817", "questionFrontendId": "706", "categoryTitle": "Algorithms", "boundTopicId": 1694, "title": "Design HashMap", "titleSlug": "design-hashmap", "content": "

Design a HashMap without using any built-in hash table libraries.

\n\n

Implement the MyHashMap class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["MyHashMap", "put", "put", "get", "get", "put", "get", "remove", "get"]\n[[], [1, 1], [2, 2], [1], [3], [2, 1], [2], [2], [2]]\nOutput\n[null, null, null, 1, -1, null, 1, null, -1]\n\nExplanation\nMyHashMap myHashMap = new MyHashMap();\nmyHashMap.put(1, 1); // The map is now [[1,1]]\nmyHashMap.put(2, 2); // The map is now [[1,1], [2,2]]\nmyHashMap.get(1);    // return 1, The map is now [[1,1], [2,2]]\nmyHashMap.get(3);    // return -1 (i.e., not found), The map is now [[1,1], [2,2]]\nmyHashMap.put(2, 1); // The map is now [[1,1], [2,1]] (i.e., update the existing value)\nmyHashMap.get(2);    // return 1, The map is now [[1,1], [2,1]]\nmyHashMap.remove(2); // remove the mapping for 2, The map is now [[1,1]]\nmyHashMap.get(2);    // return -1 (i.e., not found), The map is now [[1,1]]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "设计哈希映射", "translatedContent": "

不使用任何内建的哈希表库设计一个哈希映射（HashMap）。

\n\n

实现 MyHashMap 类：

\n\n\n\n

 

\n\n

示例：

\n\n
\n输入：\n[\"MyHashMap\", \"put\", \"put\", \"get\", \"get\", \"put\", \"get\", \"remove\", \"get\"]\n[[], [1, 1], [2, 2], [1], [3], [2, 1], [2], [2], [2]]\n输出：\n[null, null, null, 1, -1, null, 1, null, -1]\n\n解释：\nMyHashMap myHashMap = new MyHashMap();\nmyHashMap.put(1, 1); // myHashMap 现在为 [[1,1]]\nmyHashMap.put(2, 2); // myHashMap 现在为 [[1,1], [2,2]]\nmyHashMap.get(1);    // 返回 1 ，myHashMap 现在为 [[1,1], [2,2]]\nmyHashMap.get(3);    // 返回 -1（未找到），myHashMap 现在为 [[1,1], [2,2]]\nmyHashMap.put(2, 1); // myHashMap 现在为 [[1,1], [2,1]]（更新已有的值）\nmyHashMap.get(2);    // 返回 1 ，myHashMap 现在为 [[1,1], [2,1]]\nmyHashMap.remove(2); // 删除键为 2 的数据，myHashMap 现在为 [[1,1]]\nmyHashMap.get(2);    // 返回 -1（未找到），myHashMap 现在为 [[1,1]]\n
\n\n

 

\n\n

提示：

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get(int key) {\n \n }\n \n void remove(int key) {\n \n }\n};\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * MyHashMap* obj = new MyHashMap();\n * obj->put(key,value);\n * int param_2 = obj->get(key);\n * obj->remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class MyHashMap {\n\n public MyHashMap() {\n \n }\n \n public void put(int key, int value) {\n \n }\n \n public int get(int key) {\n \n }\n \n public void remove(int key) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * MyHashMap obj = new MyHashMap();\n * obj.put(key,value);\n * int param_2 = obj.get(key);\n * obj.remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class MyHashMap(object):\n\n def __init__(self):\n \n\n def put(self, key, value):\n \"\"\"\n :type key: int\n :type value: int\n :rtype: None\n \"\"\"\n \n\n def get(self, key):\n \"\"\"\n :type key: int\n :rtype: int\n \"\"\"\n \n\n def remove(self, key):\n \"\"\"\n :type key: int\n :rtype: None\n \"\"\"\n \n\n\n# Your MyHashMap object will be instantiated and called as such:\n# obj = MyHashMap()\n# obj.put(key,value)\n# param_2 = obj.get(key)\n# obj.remove(key)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class MyHashMap:\n\n def __init__(self):\n \n\n def put(self, key: int, value: int) -> None:\n \n\n def get(self, key: int) -> int:\n \n\n def remove(self, key: int) -> None:\n \n\n\n# Your MyHashMap object will be instantiated and called as such:\n# obj = MyHashMap()\n# obj.put(key,value)\n# param_2 = obj.get(key)\n# obj.remove(key)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} MyHashMap;\n\n\nMyHashMap* myHashMapCreate() {\n \n}\n\nvoid myHashMapPut(MyHashMap* obj, int key, int value) {\n \n}\n\nint myHashMapGet(MyHashMap* obj, int key) {\n \n}\n\nvoid myHashMapRemove(MyHashMap* obj, int key) {\n \n}\n\nvoid myHashMapFree(MyHashMap* obj) {\n \n}\n\n/**\n * Your MyHashMap struct will be instantiated and called as such:\n * MyHashMap* obj = myHashMapCreate();\n * myHashMapPut(obj, key, value);\n \n * int param_2 = myHashMapGet(obj, key);\n \n * myHashMapRemove(obj, key);\n \n * myHashMapFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class MyHashMap {\n\n public MyHashMap() {\n \n }\n \n public void Put(int key, int value) {\n \n }\n \n public int Get(int key) {\n \n }\n \n public void Remove(int key) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * MyHashMap obj = new MyHashMap();\n * obj.Put(key,value);\n * int param_2 = obj.Get(key);\n * obj.Remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar MyHashMap = function() {\n \n};\n\n/** \n * @param {number} key \n * @param {number} value\n * @return {void}\n */\nMyHashMap.prototype.put = function(key, value) {\n \n};\n\n/** \n * @param {number} key\n * @return {number}\n */\nMyHashMap.prototype.get = function(key) {\n \n};\n\n/** \n * @param {number} key\n * @return {void}\n */\nMyHashMap.prototype.remove = function(key) {\n \n};\n\n/** \n * Your MyHashMap object will be instantiated and called as such:\n * var obj = new MyHashMap()\n * obj.put(key,value)\n * var param_2 = obj.get(key)\n * obj.remove(key)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class MyHashMap {\n constructor() {\n \n }\n\n put(key: number, value: number): void {\n \n }\n\n get(key: number): number {\n \n }\n\n remove(key: number): void {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * var obj = new MyHashMap()\n * obj.put(key,value)\n * var param_2 = obj.get(key)\n * obj.remove(key)\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class MyHashMap {\n /**\n */\n function __construct() {\n \n }\n \n /**\n * @param Integer $key\n * @param Integer $value\n * @return NULL\n */\n function put($key, $value) {\n \n }\n \n /**\n * @param Integer $key\n * @return Integer\n */\n function get($key) {\n \n }\n \n /**\n * @param Integer $key\n * @return NULL\n */\n function remove($key) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * $obj = MyHashMap();\n * $obj->put($key, $value);\n * $ret_2 = $obj->get($key);\n * $obj->remove($key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass MyHashMap {\n\n init() {\n \n }\n \n func put(_ key: Int, _ value: Int) {\n \n }\n \n func get(_ key: Int) -> Int {\n \n }\n \n func remove(_ key: Int) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * let obj = MyHashMap()\n * obj.put(key, value)\n * let ret_2: Int = obj.get(key)\n * obj.remove(key)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class MyHashMap() {\n\n fun put(key: Int, value: Int) {\n \n }\n\n fun get(key: Int): Int {\n \n }\n\n fun remove(key: Int) {\n \n }\n\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * var obj = MyHashMap()\n * obj.put(key,value)\n * var param_2 = obj.get(key)\n * obj.remove(key)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class MyHashMap {\n\n MyHashMap() {\n \n }\n \n void put(int key, int value) {\n \n }\n \n int get(int key) {\n \n }\n \n void remove(int key) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * MyHashMap obj = MyHashMap();\n * obj.put(key,value);\n * int param2 = obj.get(key);\n * obj.remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type MyHashMap struct {\n \n}\n\n\nfunc Constructor() MyHashMap {\n \n}\n\n\nfunc (this *MyHashMap) Put(key int, value int) {\n \n}\n\n\nfunc (this *MyHashMap) Get(key int) int {\n \n}\n\n\nfunc (this *MyHashMap) Remove(key int) {\n \n}\n\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Put(key,value);\n * param_2 := obj.Get(key);\n * obj.Remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class MyHashMap\n def initialize()\n \n end\n\n\n=begin\n :type key: Integer\n :type value: Integer\n :rtype: Void\n=end\n def put(key, value)\n \n end\n\n\n=begin\n :type key: Integer\n :rtype: Integer\n=end\n def get(key)\n \n end\n\n\n=begin\n :type key: Integer\n :rtype: Void\n=end\n def remove(key)\n \n end\n\n\nend\n\n# Your MyHashMap object will be instantiated and called as such:\n# obj = MyHashMap.new()\n# obj.put(key, value)\n# param_2 = obj.get(key)\n# obj.remove(key)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class MyHashMap() {\n\n def put(key: Int, value: Int): Unit = {\n \n }\n\n def get(key: Int): Int = {\n \n }\n\n def remove(key: Int): Unit = {\n \n }\n\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * val obj = new MyHashMap()\n * obj.put(key,value)\n * val param_2 = obj.get(key)\n * obj.remove(key)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct MyHashMap {\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 MyHashMap {\n\n fn new() -> Self {\n \n }\n \n fn put(&self, key: i32, value: i32) {\n \n }\n \n fn get(&self, key: i32) -> i32 {\n \n }\n \n fn remove(&self, key: i32) {\n \n }\n}\n\n/**\n * Your MyHashMap object will be instantiated and called as such:\n * let obj = MyHashMap::new();\n * obj.put(key, value);\n * let ret_2: i32 = obj.get(key);\n * obj.remove(key);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define my-hash-map%\n (class object%\n (super-new)\n \n (init-field)\n \n ; put : exact-integer? exact-integer? -> void?\n (define/public (put key value)\n )\n ; get : exact-integer? -> exact-integer?\n (define/public (get key)\n )\n ; remove : exact-integer? -> void?\n (define/public (remove key)\n )))\n\n;; Your my-hash-map% object will be instantiated and called as such:\n;; (define obj (new my-hash-map%))\n;; (send obj put key value)\n;; (define param_2 (send obj get key))\n;; (send obj remove key)", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec my_hash_map_init_() -> any().\nmy_hash_map_init_() ->\n .\n\n-spec my_hash_map_put(Key :: integer(), Value :: integer()) -> any().\nmy_hash_map_put(Key, Value) ->\n .\n\n-spec my_hash_map_get(Key :: integer()) -> integer().\nmy_hash_map_get(Key) ->\n .\n\n-spec my_hash_map_remove(Key :: integer()) -> any().\nmy_hash_map_remove(Key) ->\n .\n\n\n%% Your functions will be called as such:\n%% my_hash_map_init_(),\n%% my_hash_map_put(Key, Value),\n%% Param_2 = my_hash_map_get(Key),\n%% my_hash_map_remove(Key),\n\n%% my_hash_map_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule MyHashMap do\n @spec init_() :: any\n def init_() do\n \n end\n\n @spec put(key :: integer, value :: integer) :: any\n def put(key, value) do\n \n end\n\n @spec get(key :: integer) :: integer\n def get(key) do\n \n end\n\n @spec remove(key :: integer) :: any\n def remove(key) do\n \n end\nend\n\n# Your functions will be called as such:\n# MyHashMap.init_()\n# MyHashMap.put(key, value)\n# param_2 = MyHashMap.get(key)\n# MyHashMap.remove(key)\n\n# MyHashMap.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": 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