Задача 6

#include <iostream>
#include <map>
#include <set>
#include <vector>

using namespace std;

template <typename First, typename Second>
ostream& operator<<(ostream& out, const pair<First, Second>& p) {
    return out << '(' << p.first << ", "s << p.second << ')';
}

template <typename Container>
void Print(ostream& out, const Container& container) {
    bool is_first = true;
    for (const auto& element : container) {
        if (!is_first) {
            out << ", "s;
        }
        is_first = false;
        out << element;
    }
}

template <typename Element>
ostream& operator<<(ostream& out, const vector<Element>& container) {
    out << '[';
    Print(out, container);
    out << ']';
    return out;
}

template <typename Element>
ostream& operator<<(ostream& out, const set<Element>& container) {
    out << '{';
    Print(out, container);
    out << '}';
    return out;
}

template <typename Key, typename Value>
ostream& operator<<(ostream& out, const map<Key, Value>& container) {
    out << '<';
    Print(out, container);
    out << '>';
    return out;
}

int main() {
    const set<string> cats = {"Мурка"s, "Белка"s, "Георгий"s, "Рюрик"s};
    cout << cats << endl;

    const vector<int> ages = {10, 5, 2, 12};
    cout << ages << endl;

    const map<string, int> cat_ages = {
        {"Мурка"s, 10},
        {"Белка"s, 5},
        {"Георгий"s, 2},
        {"Рюрик"s, 12}
    };
    cout << cat_ages << endl;
}