// http://tinodidriksen.com/2010/01/31/snippet-vector-to-output-stream/
#include <ostream>
#include <iostream>
#include <vector>

template<typename T>
std::ostream& operator<<(std::ostream& stm, const std::vector<T>& obj) {
    stm << "[";
    if (!obj.empty()) {
        for (size_t i = 0 ; i<obj.size()-1 ; ++i) {
            stm << obj[i] << ",";
        }
        stm << obj.back();
    }
    stm << "]";
    return stm;
}

int main() {
    std::vector<int> vec;
    vec.push_back(1);
    vec.push_back(2);
    vec.push_back(3);
    vec.push_back(2);
    vec.push_back(5);
    vec.push_back(6);
    vec.push_back(1);
    std::cout << vec << std::endl;
}