func_code_string: #include <bits/stdc++.h>   using namespace std;   class Solution {    public:     void solve(std::istream& in, std::ostream& out) {       int w, h;       in >> w >> h;       vector<string> m(h);       for (string& s : m) in >> s;       for (int i = 0; i < 2 * w; ++i) {         for (int j = 0; j < 2 * h; ++j) out << m[j / 2][i / 2];         out <<   n ;       }     }   };   void solve(std::istream& in, std::ostream& out) {     out << std::setprecision(12);     Solution solution;     solution.solve(in, out);   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     istream& in = cin;     ostream& out = cout;     solve(in, out);     return 0;   }   