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        "question": {
            "questionId": "535",
            "questionFrontendId": "535",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1195,
            "title": "Encode and Decode TinyURL",
            "titleSlug": "encode-and-decode-tinyurl",
            "content": "<blockquote>Note: This is a companion problem to the <a href=\"https://leetcode.com/discuss/interview-question/system-design/\" target=\"_blank\">System Design</a> problem: <a href=\"https://leetcode.com/discuss/interview-question/124658/Design-a-URL-Shortener-(-TinyURL-)-System/\" target=\"_blank\">Design TinyURL</a>.</blockquote>\n\n<p>TinyURL is a URL shortening service where you enter a URL such as <code>https://leetcode.com/problems/design-tinyurl</code> and it returns a short URL such as <code>http://tinyurl.com/4e9iAk</code>. Design a class to encode a URL and decode a tiny URL.</p>\n\n<p>There is no restriction on how your encode/decode algorithm should work. You just need to ensure that a URL can be encoded to a tiny URL and the tiny URL can be decoded to the original URL.</p>\n\n<p>Implement the <code>Solution</code> class:</p>\n\n<ul>\n\t<li><code>Solution()</code> Initializes the object of the system.</li>\n\t<li><code>String encode(String longUrl)</code> Returns a tiny URL for the given <code>longUrl</code>.</li>\n\t<li><code>String decode(String shortUrl)</code> Returns the original long URL for the given <code>shortUrl</code>. It is guaranteed that the given <code>shortUrl</code> was encoded by the same object.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> url = &quot;https://leetcode.com/problems/design-tinyurl&quot;\n<strong>Output:</strong> &quot;https://leetcode.com/problems/design-tinyurl&quot;\n\n<strong>Explanation:</strong>\nSolution obj = new Solution();\nstring tiny = obj.encode(url); // returns the encoded tiny url.\nstring ans = obj.decode(tiny); // returns the original url after decoding it.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= url.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>url</code> is guranteed to be a valid URL.</li>\n</ul>\n",
            "translatedTitle": "TinyURL 的加密与解密",
            "translatedContent": "<p>TinyURL 是一种 URL 简化服务， 比如：当你输入一个 URL&nbsp;<code>https://leetcode.com/problems/design-tinyurl</code>&nbsp;时，它将返回一个简化的URL&nbsp;<code>http://tinyurl.com/4e9iAk</code> 。请你设计一个类来加密与解密 TinyURL 。</p>\n\n<p>加密和解密算法如何设计和运作是没有限制的，你只需要保证一个 URL 可以被加密成一个 TinyURL ，并且这个 TinyURL 可以用解密方法恢复成原本的 URL 。</p>\n\n<p>实现 <code>Solution</code> 类：</p>\n\n<div class=\"original__bRMd\">\n<div>\n<ul>\n\t<li><code>Solution()</code> 初始化 TinyURL 系统对象。</li>\n\t<li><code>String encode(String longUrl)</code> 返回 <code>longUrl</code> 对应的 TinyURL 。</li>\n\t<li><code>String decode(String shortUrl)</code> 返回 <code>shortUrl</code> 原本的 URL 。题目数据保证给定的 <code>shortUrl</code> 是由同一个系统对象加密的。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例：</strong></p>\n\n<pre>\n<strong>输入：</strong>url = \"https://leetcode.com/problems/design-tinyurl\"\n<strong>输出：</strong>\"https://leetcode.com/problems/design-tinyurl\"\n\n<strong>解释：</strong>\nSolution obj = new Solution();\nstring tiny = obj.encode(url); // 返回加密后得到的 TinyURL 。\nstring ans = obj.decode(tiny); // 返回解密后得到的原本的 URL 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= url.length &lt;= 10<sup>4</sup></code></li>\n\t<li>题目数据保证 <code>url</code> 是一个有效的 URL</li>\n</ul>\n</div>\n</div>\n",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class Solution {\npublic:\n\n    // Encodes a URL to a shortened URL.\n    string encode(string longUrl) {\n        \n    }\n\n    // Decodes a shortened URL to its original URL.\n    string decode(string shortUrl) {\n        \n    }\n};\n\n// Your Solution object will be instantiated and called as such:\n// Solution solution;\n// solution.decode(solution.encode(url));",
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                    "lang": "Java",
                    "langSlug": "java",
                    "code": "public class Codec {\n\n    // Encodes a URL to a shortened URL.\n    public String encode(String longUrl) {\n        \n    }\n\n    // Decodes a shortened URL to its original URL.\n    public String decode(String shortUrl) {\n        \n    }\n}\n\n// Your Codec object will be instantiated and called as such:\n// Codec codec = new Codec();\n// codec.decode(codec.encode(url));",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Python3",
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                    "code": "class Codec:\n\n    def encode(self, longUrl: str) -> str:\n        \"\"\"Encodes a URL to a shortened URL.\n        \"\"\"\n        \n\n    def decode(self, shortUrl: str) -> str:\n        \"\"\"Decodes a shortened URL to its original URL.\n        \"\"\"\n        \n\n# Your Codec object will be instantiated and called as such:\n# codec = Codec()\n# codec.decode(codec.encode(url))",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Python",
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                    "code": "class Codec:\n\n    def encode(self, longUrl):\n        \"\"\"Encodes a URL to a shortened URL.\n        \n        :type longUrl: str\n        :rtype: str\n        \"\"\"\n        \n\n    def decode(self, shortUrl):\n        \"\"\"Decodes a shortened URL to its original URL.\n        \n        :type shortUrl: str\n        :rtype: str\n        \"\"\"\n        \n\n# Your Codec object will be instantiated and called as such:\n# codec = Codec()\n# codec.decode(codec.encode(url))",
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                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * Encodes a URL to a shortened URL.\n *\n * @param {string} longUrl\n * @return {string}\n */\nvar encode = function(longUrl) {\n    \n};\n\n/**\n * Decodes a shortened URL to its original URL.\n *\n * @param {string} shortUrl\n * @return {string}\n */\nvar decode = function(shortUrl) {\n    \n};\n\n/**\n * Your functions will be called as such:\n * decode(encode(url));\n */",
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                    "code": "/**\n * Encodes a URL to a shortened URL.\n */\nfunction encode(longUrl: string): string {\n\t\n};\n\n/**\n * Decodes a shortened URL to its original URL.\n */\nfunction decode(shortUrl: string): string {\n\t\n};\n\n/**\n * Your functions will be called as such:\n * decode(encode(strs));\n */",
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                    "lang": "C#",
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                    "code": "public class Codec {\n\n    // Encodes a URL to a shortened URL\n    public string encode(string longUrl) {\n        \n    }\n\n    // Decodes a shortened URL to its original URL.\n    public string decode(string shortUrl) {\n        \n    }\n}\n\n// Your Codec object will be instantiated and called as such:\n// Codec codec = new Codec();\n// codec.decode(codec.encode(url));",
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                    "lang": "C",
                    "langSlug": "c",
                    "code": "/** Encodes a URL to a shortened URL. */\nchar* encode(char* longUrl) {\n    \n}\n\n/** Decodes a shortened URL to its original URL. */\nchar* decode(char* shortUrl) {\n    \n}\n\n// Your functions will be called as such:\n// char* s = encode(s);\n// decode(s);",
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                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type Codec struct {\n    \n}\n\n\nfunc Constructor() Codec {\n    \n}\n\n// Encodes a URL to a shortened URL.\nfunc (this *Codec) encode(longUrl string) string {\n\t\n}\n\n// Decodes a shortened URL to its original URL.\nfunc (this *Codec) decode(shortUrl string) string {\n    \n}\n\n\n/**\n * Your Codec object will be instantiated and called as such:\n * obj := Constructor();\n * url := obj.encode(longUrl);\n * ans := obj.decode(url);\n */",
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                    "lang": "Kotlin",
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                    "code": "class Codec() {\n    // Encodes a URL to a shortened URL.\n    fun encode(longUrl: String): String {\n        \n    }\n\n    // Decodes a shortened URL to its original URL.\n    fun decode(shortUrl: String): String {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * var obj = Codec()\n * var url = obj.encode(longUrl)\n * var ans = obj.decode(url)\n */",
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                    "code": "class Codec {\n    // Encodes a URL to a shortened URL.\n    func encode(_ longUrl: String) -> String {\n        \n    }\n    \n    // Decodes a shortened URL to its original URL.\n    func decode(_ shortUrl: String) -> String {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * let obj = Codec()\n * val s = obj.encode(longUrl)\n * let ans = obj.decode(s)\n*/",
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                    "code": "struct Codec {\n\t\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 Codec {\n    fn new() -> Self {\n        \n    }\n\t\n    // Encodes a URL to a shortened URL.\n    fn encode(&self, longURL: String) -> String {\n        \n    }\n\t\n    // Decodes a shortened URL to its original URL.\n    fn decode(&self, shortURL: String) -> String {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * let obj = Codec::new();\n * let s: String = obj.encode(strs);\n * let ans: VecVec<String> = obj.decode(s);\n */",
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                    "code": "# Encodes a URL to a shortened URL.\n#\n# @param {string} longUrl\n# @return {string}\ndef encode(longUrl)\n    \nend\n\n# Decodes a shortened URL to its original URL.\n#\n# @param {string} shortUrl\n# @return {string}\ndef decode(shortUrl)\n    \nend\n\n\n# Your functions will be called as such:\n# decode(encode(url))",
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                    "code": "class Codec {\n    /**\n     * Encodes a URL to a shortened URL.\n     * @param String $longUrl\n     * @return String\n     */\n    function encode($longUrl) {\n        \n    }\n    \n    /**\n     * Decodes a shortened URL to its original URL.\n     * @param String $shortUrl\n     * @return String\n     */\n    function decode($shortUrl) {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * $obj = Codec();\n * $s = $obj->encode($longUrl);\n * $ans = $obj->decode($s);\n */",
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                    "code": "class Codec {\n    // Encodes a URL to a shortened URL.\n    def encode(longURL: String): String = {\n        \n    }\n    \n    // Decodes a shortened URL to its original URL.\n    def decode(shortURL: String): String = {\n        \n    }\n}\n\n/**\n * Your Codec object will be instantiated and called as such:\n * var obj = new Codec()\n * val s = obj.encode(longURL)\n * val ans = obj.decode(s)\n */",
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            "sampleTestCase": "\"https://leetcode.com/problems/design-tinyurl\"",
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