leetcode-problemset/leetcode-cn/originData/time-based-key-value-store.json

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        "question": {
            "questionId": "1023",
            "questionFrontendId": "981",
            "categoryTitle": "Algorithms",
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            "title": "Time Based Key-Value Store",
            "titleSlug": "time-based-key-value-store",
            "content": "<p>Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key&#39;s value at a certain timestamp.</p>\n\n<p>Implement the <code>TimeMap</code> class:</p>\n\n<ul>\n\t<li><code>TimeMap()</code> Initializes the object of the data structure.</li>\n\t<li><code>void set(String key, String value, int timestamp)</code> Stores the key <code>key</code> with the value <code>value</code> at the given time <code>timestamp</code>.</li>\n\t<li><code>String get(String key, int timestamp)</code> Returns a value such that <code>set</code> was called previously, with <code>timestamp_prev &lt;= timestamp</code>. If there are multiple such values, it returns the value associated with the largest <code>timestamp_prev</code>. If there are no values, it returns <code>&quot;&quot;</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;TimeMap&quot;, &quot;set&quot;, &quot;get&quot;, &quot;get&quot;, &quot;set&quot;, &quot;get&quot;, &quot;get&quot;]\n[[], [&quot;foo&quot;, &quot;bar&quot;, 1], [&quot;foo&quot;, 1], [&quot;foo&quot;, 3], [&quot;foo&quot;, &quot;bar2&quot;, 4], [&quot;foo&quot;, 4], [&quot;foo&quot;, 5]]\n<strong>Output</strong>\n[null, null, &quot;bar&quot;, &quot;bar&quot;, null, &quot;bar2&quot;, &quot;bar2&quot;]\n\n<strong>Explanation</strong>\nTimeMap timeMap = new TimeMap();\ntimeMap.set(&quot;foo&quot;, &quot;bar&quot;, 1);  // store the key &quot;foo&quot; and value &quot;bar&quot; along with timestamp = 1.\ntimeMap.get(&quot;foo&quot;, 1);         // return &quot;bar&quot;\ntimeMap.get(&quot;foo&quot;, 3);         // return &quot;bar&quot;, since there is no value corresponding to foo at timestamp 3 and timestamp 2, then the only value is at timestamp 1 is &quot;bar&quot;.\ntimeMap.set(&quot;foo&quot;, &quot;bar2&quot;, 4); // store the key &quot;foo&quot; and value &quot;bar2&quot; along with timestamp = 4.\ntimeMap.get(&quot;foo&quot;, 4);         // return &quot;bar2&quot;\ntimeMap.get(&quot;foo&quot;, 5);         // return &quot;bar2&quot;\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= key.length, value.length &lt;= 100</code></li>\n\t<li><code>key</code> and <code>value</code> consist of lowercase English letters and digits.</li>\n\t<li><code>1 &lt;= timestamp &lt;= 10<sup>7</sup></code></li>\n\t<li>All the timestamps <code>timestamp</code> of <code>set</code> are strictly increasing.</li>\n\t<li>At most <code>2 * 10<sup>5</sup></code> calls will be made to <code>set</code> and <code>get</code>.</li>\n</ul>\n",
            "translatedTitle": "基于时间的键值存储",
            "translatedContent": "<p>设计一个基于时间的键值数据结构，该结构可以在不同时间戳存储对应同一个键的多个值，并针对特定时间戳检索键对应的值。</p>\n\n<p>实现 <code>TimeMap</code> 类：</p>\n\n<ul>\n\t<li><code>TimeMap()</code> 初始化数据结构对象</li>\n\t<li><code>void set(String key, String value, int timestamp)</code> 存储给定时间戳&nbsp;<code>timestamp</code>&nbsp;时的键&nbsp;<code>key</code>&nbsp;和值&nbsp;<code>value</code>。</li>\n\t<li><code>String get(String key, int timestamp)</code>&nbsp;返回一个值，该值在之前调用了 <code>set</code>，其中&nbsp;<code>timestamp_prev &lt;= timestamp</code>&nbsp;。如果有多个这样的值，它将返回与最大 &nbsp;<code>timestamp_prev</code>&nbsp;关联的值。如果没有值，则返回空字符串（<code>\"\"</code>）。</li>\n</ul>\n&nbsp;\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>\n[\"TimeMap\", \"set\", \"get\", \"get\", \"set\", \"get\", \"get\"]\n[[], [\"foo\", \"bar\", 1], [\"foo\", 1], [\"foo\", 3], [\"foo\", \"bar2\", 4], [\"foo\", 4], [\"foo\", 5]]\n<strong>输出：</strong>\n[null, null, \"bar\", \"bar\", null, \"bar2\", \"bar2\"]\n\n<strong>解释：</strong>\nTimeMap timeMap = new TimeMap();\ntimeMap.set(\"foo\", \"bar\", 1);  // 存储键 \"foo\" 和值 \"bar\" ，时间戳 timestamp = 1 &nbsp; \ntimeMap.get(\"foo\", 1);         // 返回 \"bar\"\ntimeMap.get(\"foo\", 3);         // 返回 \"bar\", 因为在时间戳 3 和时间戳 2 处没有对应 \"foo\" 的值，所以唯一的值位于时间戳 1 处（即 \"bar\"） 。\ntimeMap.set(\"foo\", \"bar2\", 4); // 存储键 \"foo\" 和值 \"bar2\" ，时间戳 timestamp = 4&nbsp; \ntimeMap.get(\"foo\", 4);         // 返回 \"bar2\"\ntimeMap.get(\"foo\", 5);         // 返回 \"bar2\"\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= key.length, value.length &lt;= 100</code></li>\n\t<li><code>key</code> 和 <code>value</code> 由小写英文字母和数字组成</li>\n\t<li><code>1 &lt;= timestamp &lt;= 10<sup>7</sup></code></li>\n\t<li><code>set</code> 操作中的时间戳 <code>timestamp</code> 都是严格递增的</li>\n\t<li>最多调用&nbsp;<code>set</code> 和 <code>get</code> 操作 <code>2 * 10<sup>5</sup></code> 次</li>\n</ul>\n",
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                    "code": "class TimeMap {\npublic:\n    TimeMap() {\n\n    }\n    \n    void set(string key, string value, int timestamp) {\n\n    }\n    \n    string get(string key, int timestamp) {\n\n    }\n};\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * TimeMap* obj = new TimeMap();\n * obj->set(key,value,timestamp);\n * string param_2 = obj->get(key,timestamp);\n */",
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                    "code": "class TimeMap {\n\n    public TimeMap() {\n\n    }\n    \n    public void set(String key, String value, int timestamp) {\n\n    }\n    \n    public String get(String key, int timestamp) {\n\n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * TimeMap obj = new TimeMap();\n * obj.set(key,value,timestamp);\n * String param_2 = obj.get(key,timestamp);\n */",
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                    "lang": "Python",
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                    "code": "class TimeMap(object):\n\n    def __init__(self):\n\n\n    def set(self, key, value, timestamp):\n        \"\"\"\n        :type key: str\n        :type value: str\n        :type timestamp: int\n        :rtype: None\n        \"\"\"\n\n\n    def get(self, key, timestamp):\n        \"\"\"\n        :type key: str\n        :type timestamp: int\n        :rtype: str\n        \"\"\"\n\n\n\n# Your TimeMap object will be instantiated and called as such:\n# obj = TimeMap()\n# obj.set(key,value,timestamp)\n# param_2 = obj.get(key,timestamp)",
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                    "code": "class TimeMap:\n\n    def __init__(self):\n\n\n    def set(self, key: str, value: str, timestamp: int) -> None:\n\n\n    def get(self, key: str, timestamp: int) -> str:\n\n\n\n# Your TimeMap object will be instantiated and called as such:\n# obj = TimeMap()\n# obj.set(key,value,timestamp)\n# param_2 = obj.get(key,timestamp)",
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                    "code": "\n\n\ntypedef struct {\n    \n} TimeMap;\n\n\nTimeMap* timeMapCreate() {\n    \n}\n\nvoid timeMapSet(TimeMap* obj, char* key, char* value, int timestamp) {\n    \n}\n\nchar* timeMapGet(TimeMap* obj, char* key, int timestamp) {\n    \n}\n\nvoid timeMapFree(TimeMap* obj) {\n    \n}\n\n/**\n * Your TimeMap struct will be instantiated and called as such:\n * TimeMap* obj = timeMapCreate();\n * timeMapSet(obj, key, value, timestamp);\n \n * char* param_2 = timeMapGet(obj, key, timestamp);\n \n * timeMapFree(obj);\n*/",
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                    "lang": "C#",
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                    "code": "public class TimeMap {\n\n    public TimeMap() {\n\n    }\n    \n    public void Set(string key, string value, int timestamp) {\n\n    }\n    \n    public string Get(string key, int timestamp) {\n\n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * TimeMap obj = new TimeMap();\n * obj.Set(key,value,timestamp);\n * string param_2 = obj.Get(key,timestamp);\n */",
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                    "lang": "JavaScript",
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                    "code": "\nvar TimeMap = function() {\n\n};\n\n/** \n * @param {string} key \n * @param {string} value \n * @param {number} timestamp\n * @return {void}\n */\nTimeMap.prototype.set = function(key, value, timestamp) {\n\n};\n\n/** \n * @param {string} key \n * @param {number} timestamp\n * @return {string}\n */\nTimeMap.prototype.get = function(key, timestamp) {\n\n};\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * var obj = new TimeMap()\n * obj.set(key,value,timestamp)\n * var param_2 = obj.get(key,timestamp)\n */",
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                    "lang": "TypeScript",
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                    "code": "class TimeMap {\n    constructor() {\n        \n    }\n\n    set(key: string, value: string, timestamp: number): void {\n        \n    }\n\n    get(key: string, timestamp: number): string {\n        \n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * var obj = new TimeMap()\n * obj.set(key,value,timestamp)\n * var param_2 = obj.get(key,timestamp)\n */",
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                    "code": "class TimeMap {\n    /**\n     */\n    function __construct() {\n\n    }\n\n    /**\n     * @param String $key\n     * @param String $value\n     * @param Integer $timestamp\n     * @return NULL\n     */\n    function set($key, $value, $timestamp) {\n\n    }\n\n    /**\n     * @param String $key\n     * @param Integer $timestamp\n     * @return String\n     */\n    function get($key, $timestamp) {\n\n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * $obj = TimeMap();\n * $obj->set($key, $value, $timestamp);\n * $ret_2 = $obj->get($key, $timestamp);\n */",
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                    "code": "\nclass TimeMap {\n\n    init() {\n\n    }\n    \n    func set(_ key: String, _ value: String, _ timestamp: Int) {\n\n    }\n    \n    func get(_ key: String, _ timestamp: Int) -> String {\n\n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * let obj = TimeMap()\n * obj.set(key, value, timestamp)\n * let ret_2: String = obj.get(key, timestamp)\n */",
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                    "lang": "Kotlin",
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                    "code": "class TimeMap() {\n\n    fun set(key: String, value: String, timestamp: Int) {\n\n    }\n\n    fun get(key: String, timestamp: Int): String {\n\n    }\n\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * var obj = TimeMap()\n * obj.set(key,value,timestamp)\n * var param_2 = obj.get(key,timestamp)\n */",
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                    "lang": "Dart",
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                    "code": "class TimeMap {\n\n  TimeMap() {\n    \n  }\n  \n  void set(String key, String value, int timestamp) {\n    \n  }\n  \n  String get(String key, int timestamp) {\n    \n  }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * TimeMap obj = TimeMap();\n * obj.set(key,value,timestamp);\n * String param2 = obj.get(key,timestamp);\n */",
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                    "code": "type TimeMap struct {\n\n}\n\n\nfunc Constructor() TimeMap {\n\n}\n\n\nfunc (this *TimeMap) Set(key string, value string, timestamp int)  {\n\n}\n\n\nfunc (this *TimeMap) Get(key string, timestamp int) string {\n\n}\n\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Set(key,value,timestamp);\n * param_2 := obj.Get(key,timestamp);\n */",
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                    "code": "class TimeMap\n    def initialize()\n\n    end\n\n\n=begin\n    :type key: String\n    :type value: String\n    :type timestamp: Integer\n    :rtype: Void\n=end\n    def set(key, value, timestamp)\n\n    end\n\n\n=begin\n    :type key: String\n    :type timestamp: Integer\n    :rtype: String\n=end\n    def get(key, timestamp)\n\n    end\n\n\nend\n\n# Your TimeMap object will be instantiated and called as such:\n# obj = TimeMap.new()\n# obj.set(key, value, timestamp)\n# param_2 = obj.get(key, timestamp)",
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                    "code": "class TimeMap() {\n\n    def set(key: String, value: String, timestamp: Int) {\n\n    }\n\n    def get(key: String, timestamp: Int): String = {\n\n    }\n\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * var obj = new TimeMap()\n * obj.set(key,value,timestamp)\n * var param_2 = obj.get(key,timestamp)\n */",
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                    "code": "struct TimeMap {\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 TimeMap {\n\n    fn new() -> Self {\n\n    }\n    \n    fn set(&self, key: String, value: String, timestamp: i32) {\n\n    }\n    \n    fn get(&self, key: String, timestamp: i32) -> String {\n\n    }\n}\n\n/**\n * Your TimeMap object will be instantiated and called as such:\n * let obj = TimeMap::new();\n * obj.set(key, value, timestamp);\n * let ret_2: String = obj.get(key, timestamp);\n */",
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