1, 3 (Olya) List

#include <iostream>
#include <list>
#include <algorithm>
#include <fstream>
using namespace std;

ifstream in("input.txt");
ofstream out("output.txt");


int main()
{

    list<int> l;
    list<int> even_l;
    int cnt = 0;
    long long sum = 0;
    while (in.peek() != EOF)
    {
        int cur; in >> cur;
        l.push_back(cur);
    }

    while (!l.empty())
    {
        int cur = l.front();
        l.pop_front();
        if (cur % 2 == 0)
        {
            cnt++;
            sum += cur;
            even_l.push_back(cur);
        }
    }
    out << "count of even : " << cnt << "\n";
    out << "sum of even : " << sum << "\n";
    out << "AVG : " << sum * 1.0 / cnt;
    //even_l - лист с четными числами

}