#include <iostream>
#include <initializer_list>
#include <vector>
#include <tuple>

struct Tag;

struct Tag {
  Tag(const std::string& name, const std::string& text): name(name), text(text) {
  }

  Tag(const std::string& name, std::vector<Tag> children): name(name), children(children) {
  }

  std::vector<Tag> children;
  std::string name;
  std::string text;
};


std::ostream& operator<<(std::ostream& os, const Tag& tag) {
  os << "<" << tag.name << ">" << tag.text;

  for (const auto& child: tag.children) {
    os << child;
  }

  os << "</" << tag.name << ">";

  return os;
}

struct P: Tag {
  P(const std::string& text): Tag("p", text) {};
  P(std::initializer_list<Tag> tags): Tag{"p", tags} {};
};

int main() {
  Tag root = P {
    P {
      P {
        "Hello"
      }
    }
  };

  std::cout << root;
}