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535. Encode and Decode TinyURL

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작성일 2022.04.22 23:44

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[ Medium ] 535. Encode and Decode TinyURL

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"

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 deconding it.

Constraints:

1 <= url.length <= 104
url is guranteed to be a valid URL.

#leetcode, #문제풀이, #시즌3, #medium, #microsoft, #hash table, #string, #design, #hash function

링크

https://leetcode.com/problems/encode-and-decode-tinyurl/ 1660 회 연결

익명
작성일 2022.04.23 00:19

class Solution {
public:
    // Encodes a URL to a shortened URL.
    string encode(string longUrl) {
        m.emplace_back(longUrl);        
        return "http://tinyurl.com/" + to_string(m.size() - 1);
    }

    // Decodes a shortened URL to its original URL.
    string decode(string shortUrl) {
        return m[stoi(shortUrl.substr(19))];
    }
    
    vector<string> m;
};

익명
작성일 2022.04.23 00:58

Runtime: 4 ms, faster than 70.07% of C++ online submissions for Encode and Decode TinyURL.
Memory Usage: 6.7 MB, less than 71.13% of C++ online submissions for Encode and Decode TinyURL.

class Solution {
private:
    std::vector<std::string> vec;
public:

    // Encodes a URL to a shortened URL.
    string encode(string longUrl) {
        vec.push_back(longUrl);
        int surl = std::find(vec.begin(), vec.end(), longUrl)-vec.begin();
        return "https://tinyurl/"+std::to_string(surl);
    }

    // Decodes a shortened URL to its original URL.
    string decode(string shortUrl) {
        std::string surl = shortUrl.substr(shortUrl.find("https://tinyurl/")+16);
        int index=std::stoi(surl);        
        return vec[index];
    }
};

익명
작성일 2022.04.24 15:11

Runtime: 21 ms, faster than 6.12% of Java online submissions for Encode and Decode TinyURL.
Memory Usage: 43.4 MB, less than 53.27% of Java online submissions for Encode and Decode TinyURL.

public class Codec {

    HashMap<Integer, String> map = new HashMap<Integer, String>();
    
    // Encodes a URL to a shortened URL.
    public String encode(String longUrl) {
        map.put(longUrl.hashCode(), longUrl);
        return "http://tinyurl.com/" + longUrl.hashCode();
    }

    // Decodes a shortened URL to its original URL.
    public String decode(String shortUrl) {
        
        // extract hashCode
        String hashCode = shortUrl.replace("http://tinyurl.com/", "");
        return map.get(Integer.parseInt(hashCode));
        
    }
}

// Your Codec object will be instantiated and called as such:
// Codec codec = new Codec();
// codec.decode(codec.encode(url));