#include <bits/stdc++.h>
using namespace std;

void Judge(map<int, int> & has)
{
    if(has.find(1) == has.end())
    {
        cout << "1 is not in map!" << endl;
    }else
    {
        cout << "1 is already exist" << endl;
    }
}

int main()
{
    map<int, int> has;
    Judge(has);
    //1 is not in map!

    cout << "has[1] = " << has[1] << endl;
    //has[1] = 0

    Judge(has);
    //1 is already exist

    has.erase(1);
    Judge(has);
    //1 is not in map

    has[1] = 1;
    has[1]--;
    cout << "has[1] = " << has[1] << endl;
    //has[1] = 0;
   
    Judge(has);
    //1 is already exist

    return 0;
}