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

int main() {
    std::vector<int> values{1, 2, 3, 4, 5, 6};
    auto selected = values
        | std::views::filter([](int n) { return n % 2 == 0; })
        | std::views::transform([](int n) { return n * n; });
    std::vector<int> result;
    for (int n : selected) result.push_back(n);
    assert((result == std::vector<int>{4, 16, 36}));
    values[1] = 8;
    assert(result[0] == 4);
    std::cout << result[0] << ' ' << result[1] << ' ' << result[2] << '\n';
}