#include <iostream>
#include <vector>
#include <string>
 
struct Track
{
  Track(){}
  Track(int d, std::string t) : duration(d), title(t) {}
  int duration;
  std::string title;
};
 
std::ostream& operator<<(std::ostream& o, const Track& t)
{
  return o <<"Track[ " << t.title << ", " << t.duration << "]";
}
 
std::ostream& operator<<(std::ostream& o, const std::vector<Track>& v)
{
  for (std::vector<Track>::const_iterator it = v.begin(); it != v.end(); ++it) {
    o << *it << " ";
  }
  return o;
}
 
int main()
{
  std::vector<Track> v;
  v.push_back(Track(55, "Hairway to Steven"));
  v.push_back(Track(23, "A boy named Sue"));
  std::cout << v << "\n";
}

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