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class Comp {
public:
    bool operator() (const pair<char, int> &p1, const pair<char, int> &p2) { // cannot forget const
         if(p1.second > p2.second) 
              return true;
         else if(p1.second == p2.second)
              return p1.first < p2.first;
         else 
              return false;
    }
};          // cannot forget “;"

string convert2(const string& s) {  // cannot forget const
     if(s.empty()) return "";
     unordered_map<char, int> mp;
     vector<pair<char, int>> vp;
     for(char c : s) mp[c]++;
     for(auto p : mp) vp.push_back(p);

     //sort(vp.begin(), vp.end(), Comp());
     
     sort(vp.begin(), vp.end(), [](const pair<char, int> &p1, const pair<char, int> &p2) {
        if(p1.second > p2.second) 
              return true;
        else if(p1.second == p2.second)
              return p1.first < p2.first;
        else 
              return false; 
     });
     
     string res;
     for(auto p : vp) {
          for(int i=0; i<p.second; ++i) res += p.first;
     }
     return res;
}