DictionariesEX04Shopping - Test 01

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ArraysAndLists
{
    class Program
    {
        static void Main(string[] args)
        {
            SortedDictionary<string, int> productsInStock = new SortedDictionary<string, int>();
            string[] input = Console.ReadLine().Split(new char[] { ' ' },StringSplitOptions.RemoveEmptyEntries);

            while(input[0] != "shopping")
            {

                string productName = input[1];
                int quantity = int.Parse(input[2]);

                if(!productsInStock.ContainsKey(productName))
                {
                    productsInStock[productName] = 0;
                }
                productsInStock[productName]+=quantity;

                input = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            }

            input = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

            List<string> DoNotExist = new List<string>();

            while(input[0] != "exam")
            {
                string productName = input[1];
                int quantity = int.Parse(input[2]);

                if(!productsInStock.ContainsKey(productName))
                {
                    DoNotExist.Add(productName);
                }
                else
                {
                    if (productsInStock[productName] > 0)
                    {
                        productsInStock[productName] -= quantity;
                        if (productsInStock[productName] <= 0)
                        {
                            productsInStock.Remove(productName);

                        }
                    }
                    else if (productsInStock[productName] <= 0)
                    {
                        productsInStock.Remove(productName);
                    }
                }
                input = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            }


            for( int i =0; i < DoNotExist.Count; i++)
            {
                Console.WriteLine(string.Join(" ", DoNotExist[i] + " doesn't exist"));
            }

            foreach (KeyValuePair<string,int> item in productsInStock)
            {
                Console.WriteLine($"{item.Key} -> {item.Value}");
            }
        }
    }
}