Design and build a "least recently used" cache, which evicts the least recently used item. The cache should map from keys to values (allowing you to insert and retrieve a value associated with a particular key) and be initialized with a max size. When it is full, it should evict the least recently used item.
\r\n\r\nYou should implement following operations: get and put.
Get a value by key: get(key) - If key is in the cache, return the value, otherwise return -1.
\r\nWrite a key-value pair to the cache: put(key, value) - If the key is not in the cache, then write its value to the cache. Evict the least recently used item before writing if necessary.
Example:
\r\n\r\n\r\nLRUCache cache = new LRUCache( 2 /* capacity */ );\r\n\r\ncache.put(1, 1);\r\ncache.put(2, 2);\r\ncache.get(1); // returns 1\r\ncache.put(3, 3); // evicts key 2\r\ncache.get(2); // returns -1 (not found)\r\ncache.put(4, 4); // evicts key 1\r\ncache.get(1); // returns -1 (not found)\r\ncache.get(3); // returns 3\r\ncache.get(4); // returns 4\r\n\r\n", "translatedTitle": "LRU 缓存", "translatedContent": "
设计和构建一个“最近最少使用”缓存，该缓存会删除最近最少使用的项目。缓存应该从键映射到值(允许你插入和检索特定键对应的值)，并在初始化时指定最大容量。当缓存被填满时，它应该删除最近最少使用的项目。
\n\n它应该支持以下操作： 获取数据 get 和 写入数据 put 。
获取数据 get(key) - 如果密钥 (key) 存在于缓存中，则获取密钥的值（总是正数），否则返回 -1。
\n写入数据 put(key, value) - 如果密钥不存在，则写入其数据值。当缓存容量达到上限时，它应该在写入新数据之前删除最近最少使用的数据值，从而为新的数据值留出空间。
示例：
\n\n\nLRUCache cache = new LRUCache( 2 /* 缓存容量 */ );\n\ncache.put(1, 1);\ncache.put(2, 2);\ncache.get(1); // 返回 1\ncache.put(3, 3); // 该操作会使得密钥 2 作废\ncache.get(2); // 返回 -1 (未找到)\ncache.put(4, 4); // 该操作会使得密钥 1 作废\ncache.get(1); // 返回 -1 (未找到)\ncache.get(3); // 返回 3\ncache.get(4); // 返回 4\n\n", "isPaidOnly": false, "difficulty": "Medium", "likes": 198, "dislikes": 0, "isLiked": null, "similarQuestions": "[]", "contributors": [], "langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"typescript\": false, \"bash\": false, \"php\": false, \"swift\": false, \"kotlin\": false, \"dart\": false, \"golang\": false, \"ruby\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"rust\": false, \"racket\": false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false, \"cangjie\": false}", "topicTags": [ { "name": "Design", "slug": "design", "translatedName": "设计", "__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": "哈希表", "__typename": "TopicTagNode" }, { "name": "Linked List", "slug": "linked-list", "translatedName": "链表", "__typename": "TopicTagNode" }, { "name": "Doubly-Linked List", "slug": "doubly-linked-list", "translatedName": "双向链表", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class LRUCache {\npublic:\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 = 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): Unit = {\n \n }\n\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * val obj = new LRUCache(capacity)\n * val 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" }, { "lang": "Cangjie", "langSlug": "cangjie", "code": "class LRUCache {\n init(capacity: Int64) {\n\n }\n \n func get(key: Int64): Int64 {\n\n }\n \n func put(key: Int64, value: Int64): Unit {\n\n }\n}\n\n/**\n * Your LRUCache object will be instantiated and called as such:\n * let obj: LRUCache = LRUCache(capacity)\n * let param_1 = obj.get(key)\n * 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