String DNA

#include <iostream>
#include <cstring>
using namespace std;
int main() {
    int t;
    while(cin >> t){
        string s;
        cin >> s;
        int l = s.length(), h = (l*t*4)-(3*t)-t+1, w = (l*3), i, j, x1 = 0, x2 = l+(l-6), chi = 0, rev = 0;
        char dna[h][w];
        memset(dna, ' ', sizeof(dna));
        for(i = 0; i < h; ++i){
            dna[i][x1] = s[chi];
            dna[i][x2] = s[chi];
            dna[i][x1+l+(l-6)] = s[chi];
            dna[i][x2+l+(l-6)] = s[chi];
            if(chi >= l-1) rev = 1;
            if(chi <= 0) rev = 0;
            rev == 0 ? chi++ : chi--;
            if(i%(l*2-2) >= 2 && i%(l*2-2) <= l-2){ x1++; x2--; }
            else if((i >= l-1 || i >= (l*2)-2) && x1 > 0){ x1--; x2++;}
        }
        for(i = 0; i < h; ++i){
            for(j = 0; j < w; ++j){
                cout << dna[i][j];
            }
            cout << "\n";
        }
        cout << "\n";
    }
    return 0;
}