encode-and-decode-tinyurl

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<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>

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.

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.

Implement the <code>Solution</code> class:

<ul>
	<li><code>Solution()</code> Initializes the object of the system.</li>
	<li><code>String encode(String longUrl)</code> Returns a tiny URL for the given <code>longUrl</code>.</li>
	<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>
</ul>

&nbsp;
Example 1:

<pre>
Input: url = &quot;https://leetcode.com/problems/design-tinyurl&quot;
Output: &quot;https://leetcode.com/problems/design-tinyurl&quot;

Explanation:
Solution obj = new Solution();
string tiny = obj.encode(url); // returns the encoded tiny url.
string ans = obj.decode(tiny); // returns the original url after decoding it.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= url.length &lt;= 104</code></li>
	<li><code>url</code> is guranteed to be a valid URL.</li>
</ul>

CodecDriver

Encode and Decode TinyURL

Design

Hash Table

String

Hash Function

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 。

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 。

实现 <code>Solution</code> 类：

<div class="original__bRMd">
<div>
<ul>
	<li><code>Solution()</code> 初始化 TinyURL 系统对象。</li>
	<li><code>String encode(String longUrl)</code> 返回 <code>longUrl</code> 对应的 TinyURL 。</li>
	<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>
</ul>

&nbsp;

示例：

<pre>
输入：url = "https://leetcode.com/problems/design-tinyurl"
输出："https://leetcode.com/problems/design-tinyurl"

解释：
Solution obj = new Solution();
string tiny = obj.encode(url); // 返回加密后得到的 TinyURL 。
string ans = obj.decode(tiny); // 返回解密后得到的原本的 URL 。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= url.length &lt;= 104</code></li>
	<li>题目数据保证 <code>url</code> 是一个有效的 URL</li>
</ul>
</div>
</div>