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        "question": {
            "questionId": "1023",
            "questionFrontendId": "981",
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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>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",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "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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                    "lang": "Java",
                    "langSlug": "java",
                    "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 */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
                    "langSlug": "python",
                    "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)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "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)",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C",
                    "langSlug": "c",
                    "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*/",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "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 */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "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 */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "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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                    "lang": "Swift",
                    "langSlug": "swift",
                    "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 */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "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 */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "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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                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "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": "Rust",
                    "langSlug": "rust",
                    "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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                    "lang": "PHP",
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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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                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "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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                    "lang": "Racket",
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                    "code": "(define time-map%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; set : string? string? exact-integer? -> void?\n    (define/public (set key value timestamp)\n\n      )\n    ; get : string? exact-integer? -> string?\n    (define/public (get key timestamp)\n\n      )))\n\n;; Your time-map% object will be instantiated and called as such:\n;; (define obj (new time-map%))\n;; (send obj set key value timestamp)\n;; (define param_2 (send obj get key timestamp))",
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                    "lang": "Erlang",
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                    "code": "-spec time_map_init_() -> any().\ntime_map_init_() ->\n  .\n\n-spec time_map_set(Key :: unicode:unicode_binary(), Value :: unicode:unicode_binary(), Timestamp :: integer()) -> any().\ntime_map_set(Key, Value, Timestamp) ->\n  .\n\n-spec time_map_get(Key :: unicode:unicode_binary(), Timestamp :: integer()) -> unicode:unicode_binary().\ntime_map_get(Key, Timestamp) ->\n  .\n\n\n%% Your functions will be called as such:\n%% time_map_init_(),\n%% time_map_set(Key, Value, Timestamp),\n%% Param_2 = time_map_get(Key, Timestamp),\n\n%% time_map_init_ will be called before every test case, in which you can do some necessary initializations.",
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                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule TimeMap do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec set(key :: String.t, value :: String.t, timestamp :: integer) :: any\n  def set(key, value, timestamp) do\n\n  end\n\n  @spec get(key :: String.t, timestamp :: integer) :: String.t\n  def get(key, timestamp) do\n\n  end\nend\n\n# Your functions will be called as such:\n# TimeMap.init_()\n# TimeMap.set(key, value, timestamp)\n# param_2 = TimeMap.get(key, timestamp)\n\n# TimeMap.init_ will be called before every test case, in which you can do some necessary initializations.",
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For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu99 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. 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