/*
 * Copyright (c) JoinQuant Development Team
 * Author: Huayong Kuang <kuanghuayong@joinquant.com>
 */

#include <iostream>
#include <unordered_map>
using namespace std;

typedef unordered_map<int, int> uo_map_t;

string check_key(uo_map_t m, int key)
{
 // Key is not present
 if (m.find(key) == m.end())
 return "Not Present";

 return "Present";
}

int main()
{
 uo_map_t m;

 // Initializing keys and mapped values
 m[1] = 4;
 m[2] = 6;
 m[4] = 6;

 // Keys to be checked
 int check1 = 5, check2 = 4;

 // Function call
 cout << check1 << ": " << check_key(m, check1) << endl;
 cout << check2 << ": " << check_key(m, check2) << endl;

 int t = m[10];
 cout << "try get value from map: " << t << endl;

 int t2 = m.at(20);
 cout << "at 20: " << t2 << endl;
}