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: 将longUrl压入栈中，并将longUrl后缀转换为数字加入到tinyurl的后缀。
decode: 找出tinyurl的后缀数字，返回栈中数字对应的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
原文：http://www.cnblogs.com/immjc/p/7141326.html