#include <vector>
#include <iostream>
#include <sstream>
#include <iterator>
int main(void)
{
std::vector<int> v = {4, 6, 8, 2, 1, 10, 3, 5, 13};
std::stringstream ss;
copy(v.begin(), v.end(), std::ostream_iterator<int>(ss, " "));
std::string str = ss.str();
std::cout << str;
}
/*
run:
4 6 8 2 1 10 3 5 13
*/