1082 read number in chinese

#include <string>
#include <iostream>
#include <vector>
using namespace std;
string number[] = {"ling","yi","er","san","si","wu","liu","qi","ba","jiu"};
string unit[] = {"","Shi","Bai","Qian","Wan","Shi","Bai","Qian","Yi"};
int main(){
    string ret;
    vector<string> trans;
    cin >> ret;
    if(ret == "0"){
        cout << "ling" << endl;
        return 0;
    }
    if(ret[0] == ‘-‘){
        cout << "Fu ";
        ret = ret.substr(1);
    }
    for(int i = ret.size() - 1;i >= 0;i--){
        if(ret[i] != ‘0‘){
            if(unit[ret.size() - 1 - i] != "")
                trans.push_back(unit[ret.size() - 1 - i]);
            trans.push_back(number[ret[i] - ‘0‘]);
        }
        else{
            int s(ret.size() - 1 - i);
            while(ret[i] == ‘0‘)
                i--;
            if(s == 4){
                if(ret.size() - 1 - i != 8){
                    trans.push_back(unit[s]);
                    trans.push_back(unit[ret.size() - 1 - i]);
                    trans.push_back(number[ret[i] - ‘0‘]);
                }
                else{
                    trans.push_back("ling");
                    trans.push_back("Yi");;
                    trans.push_back(number[ret[i] - ‘0‘]); 
                }
            }
            else if(s < 4){
                if(s != 0)
                    trans.push_back("ling");
                if(ret.size() - 1 - i > 4 && ret.size() - 1 - i != 8){
                    trans.push_back("Wan");
                    trans.push_back(unit[ret.size() - 1 - i]);
                    trans.push_back(number[ret[i] - ‘0‘]);
                }
                else{
                    trans.push_back(unit[ret.size() - 1 - i]);
                    trans.push_back(number[ret[i] - ‘0‘]);
                }
            }
            else{
                if(ret.size() - 1 - i == 8){
                    trans.push_back("ling");
                    trans.push_back("Yi");
                    trans.push_back(number[ret[i] - ‘0‘]);
                }
                else{
                    trans.push_back(unit[ret.size() - 1 - i]);
                    trans.push_back(number[ret[i] - ‘0‘]);
                }
            }
        }
    }
    for(int i = trans.size() - 1;i >= 0;i--){
        if(i == trans.size() - 1)
            cout << trans[i];
        else
            cout << ‘ ‘ << trans[i];
    }
    cout << endl;
    return 0;
}