535. Encode and Decode TinyURL
Explanation:
To encode and decode a URL to a tiny URL and vice versa, we can use a simple approach by utilizing a hash map to store the mapping between the original URL and its corresponding tiny URL. We can generate a unique key for each long URL and use that key as the tiny URL. When decoding, we can retrieve the original URL by looking up the key in the hash map.
Encoding:
- Generate a unique key for each long URL (e.g., using a hash function).
- Store the mapping between the original URL and the generated key in a hash map.
- Return the key as the tiny URL.
Decoding:
- Given a tiny URL, extract the key from it.
- Look up the key in the hash map to retrieve the original URL.
Time Complexity:
- Encoding: O(1) on average
- Decoding: O(1)
Space Complexity: O(n), where n is the number of unique URLs encoded.
:
import java.util.HashMap;
public class Codec {
HashMap<String, String> urlMap = new HashMap<>();
String baseUrl = "http://tinyurl.com/";
// Encodes a URL to a shortened URL.
public String encode(String longUrl) {
String key = String.valueOf(longUrl.hashCode());
urlMap.put(key, longUrl);
return baseUrl + key;
}
// Decodes a shortened URL to its original URL.
public String decode(String shortUrl) {
String key = shortUrl.replace(baseUrl, "");
return urlMap.get(key);
}
}Code Editor (Testing phase)
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