#include <iostream>
#include <deque>
#include <string>
using std::cout;
using std::endl;
using std::deque;
using std::string;
int main()
{
deque<string> dq1{ "c", "c++", "java", "php" }, dq2;
dq2 = dq1;
for (string val : dq2)
cout << val << " ";
cout << endl;
return 0;
}
/*
run:
c c++ java php
*/