Что выведет: accumulate, count_if, partial_sum

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

int main() {
    std::vector<double> d{0.5, 0.5, 1.5};
    std::cout << std::accumulate(d.begin(), d.end(), 0) << ' '
              << std::accumulate(d.begin(), d.end(), 0.0) << '\n';
    std::vector<int> v{5, 1, 4, 2, 3};
    std::sort(v.begin(), v.end(), std::greater<>());
    std::vector<int> p(v.size());
    std::partial_sum(v.begin(), v.end(), p.begin());
    for (int x : p) std::cout << x << ' ';
    std::cout << '\n';
    auto it = std::lower_bound(p.begin(), p.end(), 12);
    std::cout << (it - p.begin()) << ' '
              << std::count_if(v.begin(), v.end(), [](int x) { return x % 2; }) << '\n';
}