[LeetCode] Encode and Decode TinyURL

標籤：tiny   problems   where   algorithm   shorturl   ret   cal   its   ant   

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 the encode and decode methods for the TinyURL service. 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.

encode: 將longUrl壓入棧中，並將longUrl尾碼轉換為數字加入到tinyurl的尾碼。

decode: 找出tinyurl的尾碼數字，返回棧中數字對應的longUrl.

class Solution {public:    vector<string> urls;    // Encodes a URL to a shortened URL.    string encode(string longUrl) {        urls.push_back(longUrl);        return "http://tinyurl.com/" + to_string(urls.size() - 1);    }    // Decodes a shortened URL to its original URL.    string decode(string shortUrl) {        auto pos = shortUrl.find_last_of(‘/‘);        int num = stoi(shortUrl.substr(pos + 1));        return urls[num];    }};// 3ms// Your Solution object will be instantiated and called as such:// Solution solution;// solution.decode(solution.encode(url));

 

[LeetCode] Encode and Decode TinyURL