View difference between Paste ID: 2mPJvTwg and NC1WCQXq

 #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;
 }