task3-sales!!!!

//5
//Sofia beer 1.20 160
//Varna chocolate 2.35 86
//Sofia coffee 0.40 853
//Varna apple 0.86 75.44
//Plovdiv beer 1.10 88
//
//Plovdiv -> 96.80
//Sofia -> 533.20
//Varna -> 266.98

#include <iostream>
#include <string>
#include <map>

using namespace std;

class Sales
{
public:
    Sales() = default;

    void add(string town, string product /*not used*/, double price, double quantity)
    {
        sales[town] += price * quantity;
    }

    void print() const
    {
        cout << fixed;
        cout.precision(2);
        for (const auto& item : sales)
            cout << item.first << " -> " << item.second << endl;
    }

private:
    map<string, double> sales;
};

int main()
{
    Sales s;
    string town, product;
    double price, quantity;
    int n;

    cin >> n;

    for (size_t i = 0; i < n; i++)
    {
        cin >> town >> product >> price >> quantity;
        s.add(town, product, price, quantity);
    }

    s.print();
}