#include <iostream>
#include <map>

using namespace std;

//map 广义数组
map <string, long long> a; 
map <string, long long>::iterator it;
//key-value pair  


  
int main(){
	long long x = -123456789012345;
	a["B"] = 2;
	a["A"] = 1;
	a["C"] = a["A"] + a["B"];
	a["X"] = 0;
	it = a.end();
	it--;
	cout << it -> first << " " << it->second << endl;
	
//	for (it = a.begin(); it != a.end(); it++)
//		cout << "Key = " << it->first << " Val = " << it->second << endl;
	
//	for (auto i:a)
//		cout << "Key = " << i.first << " Val = " << i.second << endl;//C++ 11
	
	
//	for (auto [k,v]:a)
//		cout << "Key = " << k << " Val = " << v << endl;	//C++ 14
	
//	a.erase("X"); 
//	if (a.count("X") == 1){
//		cout << "key = X存在\n";
//	} 
//	else
//		cout << "key = X不存在\n";
//	cout << a["C"] << endl;
	
	/*
		1.添加：		直接赋值就行
		2.删除：		erase(key)
		3.查询：		count(key)		 
		4.修改：		直接赋值也行 
		5.统计个数:		size
	*/
}