#include <algorithm>
#include <fstream>
#include <iostream>
#include <iterator>
#include <numeric>
#include <vector>

int main()
{
    std::ifstream ifs { "pile.txt" };
    std::vector<std::string> pile {
        std::istream_iterator<std::string>{ ifs },
        std::istream_iterator<std::string>{ }
    };

    auto it = std::stable_partition(std::begin(pile), std::end(pile),
                                    [](std::string const& note)
                                    {
                                        return note.ends_with("SEK");
                                    });

    double total_cost {
        std::inner_product(std::begin(pile), it, it, 0.0,
                           std::plus<double>{},
                           [](std::string const& a, std::string const& b)
                           {
                               double lhs { std::stod(a) };
                               double rhs { std::stod(b) };
                               return lhs * rhs;
                           })
    };
        
    std::cout << "The total income was: "
              << total_cost << "SEK" << std::endl;
}