an example of using C++ STL deque

deque is a double-ended queue

👍 g++ -std=c++11 deque.cpp && ./a.out
Cc Bb Aa Aa Bb Cc 
👍 cat deque.cpp                      
#include <iostream>
#include <vector>
#include <deque>
using namespace std;

int main() {
  vector<string> v{"Aa", "Bb", "Cc"};
  deque<string> d;
  for (const auto &s : v) {
    d.push_front(s);
    d.push_back(s);
  }
  for (const auto &e : d)
    cout << e << ' ';
  cout << endl;
}