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535. Encode and Decode TinyURL
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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 givenlongUrl
.String decode(String shortUrl)
Returns the original long URL for the givenshortUrl
. It is guaranteed that the givenshortUrl
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.
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댓글 3
austin님의 댓글
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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;
};
bobkim님의 댓글
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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.
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];
}
};
Coffee님의 댓글
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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.
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));