#include <iostream>
#include <string>
using namespace std;
#include <cstdarg>


string mycat(int n, ...) {
   string result = "";
   va_list alist;
   va_start(alist, n);
   for (int i = 0; i < n; ++i)
       result += va_arg(alist, const char *);
   va_end(alist);
   return result;
}

int main() {
   cout << mycat(3, "hello", ",", "world") << endl;
   cout << mycat(5, "not", "with", "standing", "your", "objection") << endl;
   return 0;
}