{ "data": { "question": { "questionId": "146", "questionFrontendId": "146", "categoryTitle": "Algorithms", "boundTopicId": 1074, "title": "LRU Cache", "titleSlug": "lru-cache", "content": "

Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.

\n\n

Implement the LRUCache class:

\n\n\n\n

The functions get and put must each run in O(1) average time complexity.

\n\n

 

\n

Example 1:

\n\n
\nInput\n["LRUCache", "put", "put", "get", "put", "get", "put", "get", "get", "get"]\n[[2], [1, 1], [2, 2], [1], [3, 3], [2], [4, 4], [1], [3], [4]]\nOutput\n[null, null, null, 1, null, -1, null, -1, 3, 4]\n\nExplanation\nLRUCache lRUCache = new LRUCache(2);\nlRUCache.put(1, 1); // cache is {1=1}\nlRUCache.put(2, 2); // cache is {1=1, 2=2}\nlRUCache.get(1);    // return 1\nlRUCache.put(3, 3); // LRU key was 2, evicts key 2, cache is {1=1, 3=3}\nlRUCache.get(2);    // returns -1 (not found)\nlRUCache.put(4, 4); // LRU key was 1, evicts key 1, cache is {4=4, 3=3}\nlRUCache.get(1);    // return -1 (not found)\nlRUCache.get(3);    // return 3\nlRUCache.get(4);    // return 4\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "LRU 缓存", "translatedContent": "
请你设计并实现一个满足  LRU (最近最少使用) 缓存 约束的数据结构。
\n\n
实现 LRUCache 类：
\n\n
\n
\n\n\n

函数 get 和 put 必须以 O(1) 的平均时间复杂度运行。

\n
\n
\n\n

 

\n\n

示例：

\n\n
\n输入\n[\"LRUCache\", \"put\", \"put\", \"get\", \"put\", \"get\", \"put\", \"get\", \"get\", \"get\"]\n[[2], [1, 1], [2, 2], [1], [3, 3], [2], [4, 4], [1], [3], [4]]\n输出\n[null, null, null, 1, null, -1, null, -1, 3, 4]\n\n解释\nLRUCache lRUCache = new LRUCache(2);\nlRUCache.put(1, 1); // 缓存是 {1=1}\nlRUCache.put(2, 2); // 缓存是 {1=1, 2=2}\nlRUCache.get(1);    // 返回 1\nlRUCache.put(3, 3); // 该操作会使得关键字 2 作废，缓存是 {1=1, 3=3}\nlRUCache.get(2);    // 返回 -1 (未找到)\nlRUCache.put(4, 4); // 该操作会使得关键字 1 作废，缓存是 {4=4, 3=3}\nlRUCache.get(1);    // 返回 -1 (未找到)\nlRUCache.get(3);    // 返回 3\nlRUCache.get(4);    // 返回 4\n
\n\n

 

\n\n

提示：

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* Your LRUCache object will be instantiated and called as such:\n * LRUCache* obj = new LRUCache(capacity);\n * int param_1 = obj->get(key);\n * obj->put(key,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class LRUCache {\n\n public LRUCache(int capacity) {\n\n }\n \n public int get(int key) {\n\n }\n \n public void put(int key, int value) {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * LRUCache obj = new LRUCache(capacity);\n * int param_1 = obj.get(key);\n * obj.put(key,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class LRUCache(object):\n\n def __init__(self, capacity):\n \"\"\"\n :type capacity: int\n \"\"\"\n\n\n def get(self, key):\n \"\"\"\n :type key: int\n :rtype: int\n \"\"\"\n\n\n def put(self, key, value):\n \"\"\"\n :type key: int\n :type value: int\n :rtype: None\n \"\"\"\n\n\n\n# Your LRUCache object will be instantiated and called as such:\n# obj = LRUCache(capacity)\n# param_1 = obj.get(key)\n# obj.put(key,value)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class LRUCache:\n\n def __init__(self, capacity: int):\n\n\n def get(self, key: int) -> int:\n\n\n def put(self, key: int, value: int) -> None:\n\n\n\n# Your LRUCache object will be instantiated and called as such:\n# obj = LRUCache(capacity)\n# param_1 = obj.get(key)\n# obj.put(key,value)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} LRUCache;\n\n\nLRUCache* lRUCacheCreate(int capacity) {\n \n}\n\nint lRUCacheGet(LRUCache* obj, int key) {\n \n}\n\nvoid lRUCachePut(LRUCache* obj, int key, int value) {\n \n}\n\nvoid lRUCacheFree(LRUCache* obj) {\n \n}\n\n/**\n * Your LRUCache struct will be instantiated and called as such:\n * LRUCache* obj = lRUCacheCreate(capacity);\n * int param_1 = lRUCacheGet(obj, key);\n \n * lRUCachePut(obj, key, value);\n \n * lRUCacheFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class LRUCache {\n\n public LRUCache(int capacity) {\n\n }\n \n public int Get(int key) {\n\n }\n \n public void Put(int key, int value) {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * LRUCache obj = new LRUCache(capacity);\n * int param_1 = obj.Get(key);\n * obj.Put(key,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} capacity\n */\nvar LRUCache = function(capacity) {\n\n};\n\n/** \n * @param {number} key\n * @return {number}\n */\nLRUCache.prototype.get = function(key) {\n\n};\n\n/** \n * @param {number} key \n * @param {number} value\n * @return {void}\n */\nLRUCache.prototype.put = function(key, value) {\n\n};\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * var obj = new LRUCache(capacity)\n * var param_1 = obj.get(key)\n * obj.put(key,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class LRUCache {\n constructor(capacity: number) {\n \n }\n\n get(key: number): number {\n \n }\n\n put(key: number, value: number): void {\n \n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * var obj = new LRUCache(capacity)\n * var param_1 = obj.get(key)\n * obj.put(key,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class LRUCache {\n /**\n * @param Integer $capacity\n */\n function __construct($capacity) {\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 * @param Integer $value\n * @return NULL\n */\n function put($key, $value) {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * $obj = LRUCache($capacity);\n * $ret_1 = $obj->get($key);\n * $obj->put($key, $value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass LRUCache {\n\n init(_ capacity: Int) {\n\n }\n \n func get(_ key: Int) -> Int {\n\n }\n \n func put(_ key: Int, _ value: Int) {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * let obj = LRUCache(capacity)\n * let ret_1: Int = obj.get(key)\n * obj.put(key, value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class LRUCache(capacity: Int) {\n\n fun get(key: Int): Int {\n\n }\n\n fun put(key: Int, value: Int) {\n\n }\n\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * var obj = LRUCache(capacity)\n * var param_1 = obj.get(key)\n * obj.put(key,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class LRUCache {\n\n LRUCache(int capacity) {\n \n }\n \n int get(int key) {\n \n }\n \n void put(int key, int value) {\n \n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * LRUCache obj = LRUCache(capacity);\n * int param1 = obj.get(key);\n * obj.put(key,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type LRUCache struct {\n\n}\n\n\nfunc Constructor(capacity int) LRUCache {\n\n}\n\n\nfunc (this *LRUCache) Get(key int) int {\n\n}\n\n\nfunc (this *LRUCache) Put(key int, value int) {\n\n}\n\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * obj := Constructor(capacity);\n * param_1 := obj.Get(key);\n * obj.Put(key,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class LRUCache\n\n=begin\n :type capacity: Integer\n=end\n def initialize(capacity)\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 :type value: Integer\n :rtype: Void\n=end\n def put(key, value)\n\n end\n\n\nend\n\n# Your LRUCache object will be instantiated and called as such:\n# obj = LRUCache.new(capacity)\n# param_1 = obj.get(key)\n# obj.put(key, value)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class LRUCache(_capacity: Int) {\n\n def get(key: Int): Int = {\n\n }\n\n def put(key: Int, value: Int) {\n\n }\n\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * var obj = new LRUCache(capacity)\n * var param_1 = obj.get(key)\n * obj.put(key,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct LRUCache {\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 LRUCache {\n\n fn new(capacity: i32) -> Self {\n\n }\n \n fn get(&self, key: i32) -> i32 {\n\n }\n \n fn put(&self, key: i32, value: i32) {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * let obj = LRUCache::new(capacity);\n * let ret_1: i32 = obj.get(key);\n * obj.put(key, value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define lru-cache%\n (class object%\n (super-new)\n \n ; capacity : exact-integer?\n (init-field\n capacity)\n \n ; get : exact-integer? -> exact-integer?\n (define/public (get key)\n )\n ; put : exact-integer? exact-integer? -> void?\n (define/public (put key value)\n )))\n\n;; Your lru-cache% object will be instantiated and called as such:\n;; (define obj (new lru-cache% [capacity capacity]))\n;; (define param_1 (send obj get key))\n;; (send obj put key value)", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec lru_cache_init_(Capacity :: integer()) -> any().\nlru_cache_init_(Capacity) ->\n .\n\n-spec lru_cache_get(Key :: integer()) -> integer().\nlru_cache_get(Key) ->\n .\n\n-spec lru_cache_put(Key :: integer(), Value :: integer()) -> any().\nlru_cache_put(Key, Value) ->\n .\n\n\n%% Your functions will be called as such:\n%% lru_cache_init_(Capacity),\n%% Param_1 = lru_cache_get(Key),\n%% lru_cache_put(Key, Value),\n\n%% lru_cache_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule LRUCache do\n @spec init_(capacity :: integer) :: any\n def init_(capacity) do\n \n end\n\n @spec get(key :: integer) :: integer\n def get(key) do\n \n end\n\n @spec put(key :: integer, value :: integer) :: any\n def put(key, value) do\n \n end\nend\n\n# Your functions will be called as such:\n# LRUCache.init_(capacity)\n# param_1 = LRUCache.get(key)\n# LRUCache.put(key, value)\n\n# LRUCache.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"564.3K\", \"totalSubmission\": \"1M\", \"totalAcceptedRaw\": 564285, 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