03. Orders

using System;
using System.Collections.Generic;
using System.Linq;

namespace Orders
{
    class Program
    {
        public static void Main()
        {
            Dictionary<string, double> productsAndPrices = new Dictionary<string, double>();
            Dictionary<string, int> ordersQuantity = new Dictionary<string, int>();

            string command;

            while ((command = Console.ReadLine()) != "buy")
            {
                string[] currentOrder = command.Split(" ");

                string product = currentOrder[0];
                double price = double.Parse(currentOrder[1]);
                int quantity = int.Parse(currentOrder[2]);

                if (!productsAndPrices.ContainsKey(product))
                {
                    productsAndPrices.Add(product, 0);
                    ordersQuantity.Add(product, 0);
                }

                productsAndPrices[product] = price;
                ordersQuantity[product] += quantity;
            }

            foreach (var order in ordersQuantity)
            {
                double orderPrice = productsAndPrices[order.Key] * order.Value;
                Console.WriteLine($"{order.Key} -> {orderPrice:f2}");
            }
        }
    }
}