Encode and Decode TinyURL LeetCode solution in C++

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class Solution {
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 private:
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  unordered_map<string, string> hash;
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  string server = "http://tinyurl.com/";
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  string all = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
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 public:
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  // Encodes a URL to a shortened URL.
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  string encode(string longUrl) {
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    srand(time(NULL));
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    string add = "";
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    int ran = rand() % 10;
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    int strsize = all.size();
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    while (ran) {
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      int index = rand() % strsize;
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      add += all[index];
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      ran--;
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    }
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    hash[(server + add)] = longUrl;
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    return (server + add);
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  }
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  // Decodes a shortened URL to its original URL.
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  string decode(string shortUrl) {
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    return hash[shortUrl];
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  }
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};
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// Your Solution object will be instantiated and called as such:
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// Solution solution;
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// solution.decode(solution.encode(url));