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Код
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <numeric>
#include <iterator>
#include <cmath>

using namespace std;

bool compare_abs(int x, int y) {
    return abs(x) < abs(y);
}

bool compare_2nd_digit(int x, int y) {
    return (x % 100) / 10 < (y % 100) / 10;
}

int main() {
    vector<int> a;
    cout << "Enter elements of integer array (press Ctrl+Z to stop):" << endl;
    a.assign(istream_iterator<int>(cin), istream_iterator<int>());
    if (a.empty())
        return 0;
    cout << "Element with maximum absolute value: " <<
        *max_element(a.begin(), a.end(), compare_abs) << endl;
    int avg = accumulate(a.begin(), a.end(), 0) / a.size();
    cout << "Elements less than average value: " << endl;
    remove_copy_if(a.begin(), a.end(), ostream_iterator<int>(cout, " "),
        bind1st(less<int>(), avg));
    cout << endl << "Sorted by 2nd digit:" << endl;
    sort(a.begin(), a.end(), compare_2nd_digit);
    copy(a.begin(), a.end(), ostream_iterator<int>(cout, " "));
}