#include <iostream>
#include <filesystem> // Required for std::filesystem
#include <fstream>
#include <map>
#include <set>

using namespace std ;



template < class T1 , class T2  >
void printMap( map<T1, T2> mapObj1 )
{
   	cout << "Start -----------------" << endl ;
    for ( auto pair1 : mapObj1 )
    {
	  cout << pair1.first << " : " <<
	   pair1.second << endl ;
	}
	cout << "End -----------------" << endl ;



}

template < class T1  >
void printSet( set< T1 > setObj1 )
{
   	cout << "Start -----------------" << endl ;
    for ( auto element1 : setObj1 )
    {
	  cout << element1 <<  endl ;
	}
	cout << "End -----------------" << endl ;



}



int main()
{
	std::map<int, string> src {{1, "one"}, {2, "two"}, {3, "buckle my shoe"}};
	std::map<int, string> dst {{3, "three"}};
	dst.insert(src.extract(src.find(1))); // Cheap remove and insert of { 1, "one" } from `src` to `dst`.
   // cout << "dst:" << dst << endl ;
   printMap( src ) ;
   printMap( dst ) ;



	dst.insert(src.extract(2)); // Cheap remove and insert of { 2, "two" } from `src` to `dst`.
	printMap( dst ) ;

	std::set<int> src_set {1, 3, 5};
	std::set<int> dst_set {2, 4, 5};
	dst_set.merge( src_set  )  ;
	printSet( dst_set )  ;

	std::map<int, string> map1 {{1, "one"}, {2, "two"}, {3, "three"}};
	auto node = map1.extract(2);
	node.key() = 4;
	map1.insert( std::move(node) );
    printMap(  map1 ) ;

	return 1 ;
}