Leetcode—535. TinyURL 的加密与解密【中等】

2024每日刷题（110）

Leetcode—535. TinyURL 的加密与解密

实现代码

class Solution {
public:

    // Encodes a URL to a shortened URL.
    string encode(string longUrl) {
        while(!urlToCode.count(longUrl)) {
            string code;
            for(int i = 0; i < 6; i++) {
                code += alphabets[rand() % alphabets.size()];
            }
            if(!codeToUrl.count(code)) {
                urlToCode[longUrl] = code;
                codeToUrl[code] = longUrl;
                return "http://tinyurl.com/" + code;
            }
        }
        throw;
    }

    // Decodes a shortened URL to its original URL.
    string decode(string shortUrl) {
        return codeToUrl[shortUrl.substr(19)];
    }
private:
    const string alphabets = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    unordered_map<string, string> urlToCode;
    unordered_map<string, string> codeToUrl;
};

// Your Solution object will be instantiated and called as such:
// Solution solution;
// solution.decode(solution.encode(url));

运行结果

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