#include <iostream>
#include <vector>
#include <utility>
#include <algorithm>
#include <numeric>

std::vector<std::pair<int, int>> gc_integers = { { 1, 2 }, { 3, 1 } };

int main()
{
    auto m = std::reduce(gc_integers.begin(), gc_integers.end(), std::make_pair<int, int>(0, 0),
        [](const auto& max, const auto& current)
        {
            return std::make_pair(
                std::max(max.first, current.first),
                std::max(max.second, current.second));
        });
    std::cout << "first max = " << m.first << " second max = " << m.second << std::endl;
}