#include <iostream>
#include <string>
#include <vector>

class Hello {
public:
    Hello(std::string a) : world(a) {}
    void print() {
        std::cout << world << std::endl;
    }
private:
    std::string world;
};

int main() {

    std::vector<Hello *> *hi = new std::vector<Hello *>;
    hi->push_back(new Hello("world"));
    hi->push_back(new Hello("world1"));
    hi->push_back(new Hello("world2"));
    hi->push_back(new Hello("world3"));

    for (auto i: *hi)
        i->print();


    return 0;
}