#include <iostream>
#include <vector>
#include <ranges>

int main() {
    std::vector<int> loads{2, -1, 4, 0};
    auto planned = loads | std::views::filter([](int value) { return value > 0; })
                         | std::views::transform([](int value) { return value * 2; });
    for (int value : planned) { std::cout << value << ' ' ; }
    std::cout << '\n';
}