class Solution {

 public:

     vector<string> vs_;

     Solution(){

         string t("");

         vs_.push_back(t);

         for(int i = ; i< ;++i){

             string t1  = vs_[i - ];

             t = "";

             int cnt = ,j ;

             for(j = ; j < t1.size() - ; ++j){

                 if(t1[j] == t1[j + ]){

                     ++cnt;

                 }

                 else{

                     char s[] ="";

                     sprintf(s,"%d%c",cnt,t1[j]);

                     t += string(s);

                     cnt = ;

                 }

             }

             char s[] ="";

             sprintf(s,"%d%c",cnt,t1[j]);

             t += string(s);

             vs_.push_back(t);

         }

     }

     ~Solution(){

         vs_.clear();

     }

     string countAndSay(int n) {

         return vs_[n-];

     }

 };