class Solution {
      private:
          string s;
          unordered_map<string, string> HashMap;
      public:
          Solution() {
              HashMap = {};
              for (int i = 0 ; i < 26 ; ++i) {
                  if (i < 10) s += ('0' + i);
                  s += string(1, 'a' + i) + string(1, 'A' + i);
              }
          }
          // Encodes a URL to a shortened URL.
          string encode(string longUrl) {
              string ans;
              for (int i = 0 ; i < 6 ; ++i) {
                  ans += s[rand() % s.size()];
              }
              HashMap[ans] = longUrl;
              return ans;
          }
          // Decodes a shortened URL to its original URL.
          string decode(string shortUrl) {
              return HashMap[shortUrl];
          }
      };
      

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      Encode and Decode TinyURL

      Encode and Decode TinyURL

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