Főnöknek!

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>

using namespace std;

string CharsToString(char a, char b, char c, char d);

int main(int argc, char** argv) {

    setlocale(LC_ALL,"");
    char abcd[4] = {'a','b','c','d'};
    vector<char> cv;
    for(int i=0; i<4; i++){
        cv.push_back(abcd[i]);
        for(int j=0; j<4; j++){
            cv.push_back(abcd[j]);
            for(int k=0; k<4; k++){
                cv.push_back(abcd[k]);
                for(int l=0; l<4; l++){
                    cv.push_back(abcd[l]);
                }
            }
        }
    }


    vector<string> csv;
    int sum = 0;

    for(int i = 0; i<cv.size(); i++){
            if((i)%4==0){
                string newS = CharsToString(cv[i],cv[i+1],cv[i+2],cv[i+3]);
                csv.push_back(newS);
                cout << newS << endl;
            }
    }

    if ( find(csv.begin(), csv.end(), "aaaa") != csv.end() )
   cout << "Létezik!" << endl;
else
   cout << "Nem létezik!" << endl;



    return 0;
}

string CharsToString(char a, char b, char c, char d){
    string aS;
    aS.push_back(a);
    string bS;
    bS.push_back(b);
    string cS;
    cS.push_back(c);
    string dS;
    dS.push_back(d);

    return aS+bS+cS+dS;
}