#include <algorithm>
#include <functional>
#include <numeric>
#include <random>
#include <vector>

template<class C> void init_a(C &c)
{
    std::random_device device;
    std::default_random_engine engine(device());
    std::uniform_int_distribution distribution;
    auto rng = std::bind(distribution, engine);
    std::ranges::generate(c, rng);
}

template<class C> void init_b(C &c) { std::ranges::iota(c, 0); }

int main()
{
    const size_t N = 1 << 24;    // 16M
    std::vector<int> a(N), b(N); // 16M * 4B = 64MB each one

    init_a(a);
    init_b(b);

    return std::accumulate(a.begin(), a.end(), 0) +
           std::accumulate(b.begin(), b.end(), 0);
}