Encrypt and Decrypt Strings LeetCode solution in C++

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class Encrypter {
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 public:
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  unordered_set<string> dict;
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  unordered_map<char, string> en;
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  unordered_map<string, vector<char>> dy;
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  Encrypter(vector<char> &keys, vector<string> &values, vector<string> &dictionary) {
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    for (auto &t : dictionary) {
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      dict.insert(t);
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    }
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    for (int i = 0; i < keys.size(); i++) {
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      char c = keys[i];
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      string s = values[i];
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      en[c] = s;
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      dy[s].push_back(c);
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    }
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  }
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  string encrypt(string word1) {
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    string ans = "";
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    for (char c : word1) {
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      ans += en[c];
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    }
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    return ans;
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  }
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  int decrypt(string word2) {
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    int cnt = 0;
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    for (auto t : dict) {
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      string ans = "";
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      for (int i = 0; i < t.size(); i++) {
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        ans += en[t[i]];
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      }
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      if (ans == word2) cnt++;
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    }
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    return cnt;
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  }
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};