#535

Encode and Decode TinyURL

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hash table · string · design · hash function

Description

Note: This is a companion problem to the System Design problem: Design TinyURL.

TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL such as http://tinyurl.com/4e9iAk. 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 Solution class:

- Solution() Initializes the object of the system.

- String encode(String longUrl) Returns a tiny URL for the given longUrl.

- String decode(String shortUrl) Returns the original long URL for the given shortUrl. It is guaranteed that the given shortUrl was encoded by the same object.

Example 1:

Input: url = "https://leetcode.com/problems/design-tinyurl"

Output: "https://leetcode.com/problems/design-tinyurl"

Example 2:

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.

Solution