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

int main()
{
  std::vector v {1.0, 2.0, 3.0};
  auto sum = std::reduce(begin(v), end(v));
  std::cout << sum << '\n';
  auto product = std::reduce(begin(v), end(v), 10.0, std::multiplies{});
  std::cout << product << '\n';
}