using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public class InputData{

        public InputData(string serial, int amount){

            this.Serial = serial;

            this.Amount = amount;

        }

        public string Serial {get; set;}

        public int Amount{get;set;}

    }

    public class ResultData{

        public ResultData(string serial, int amount, int newAmount, string status){

            this.Serial = serial;

            this.Amount = amount;

            this.NewAmount = newAmount;

            this.Status = status;

        }

        public ResultData(string serial, int newAmount, string status){

            this.Serial = serial;

            this.NewAmount = newAmount;

            this.Status = status;

        }

        public string Serial {get; set;}

        public int Amount{get;set;}

        public int NewAmount{get;set;}

        public string Status {get;set;}

    }

    private static Dictionary<string, InputData> CreateDictionary(List<InputData> list)

    {

        Dictionary<string, InputData> result = new Dictionary<string, InputData>();

        // Create a dictionary for objects in listTwo

        foreach(var item in list)

        {

            result.Add(item.Serial, item);

        }

        return result;

    }

    private static List<ResultData> ProcessData(List<InputData> inputList, Dictionary<string, InputData> inputDict, string status)

    {

        List<ResultData> result = new List<ResultData>();

​

        foreach(var item in inputList){

            if(inputDict.ContainsKey(item.Serial))

            {

                result.Add(new ResultData(item.Serial, inputDict[item.Serial].Amount,item.Amount, "changed"));

            }

            else

            {

                result.Add(new ResultData(item.Serial, item.Amount,item.Amount, status));

            }

        }

        return result;

    }

    public static void Main()

    {

        List<InputData> listOne = new List<InputData>

        {

            new InputData("63245-8", 10),

            new InputData("08657-5", 100),

            new InputData("29995-0", 500)

        };

        List<InputData> listTwo = new List<InputData>

        {

            new InputData("63245-8", 100),

            new InputData("67455-1", 100),

            new InputData("44187-10", 50)

        };

        Dictionary<string, InputData> dictOne = CreateDictionary(listOne);      

        Dictionary<string, InputData> dictTwo = CreateDictionary(listTwo);

        List<ResultData> result = new List<ResultData>();

        result.AddRange(ProcessData(listOne, dictTwo, "deleted"));

        result.AddRange(ProcessData(listTwo, dictOne, "new"));

        foreach(var item in result){

            Console.WriteLine($"Serial: {item.Serial}, Amount: {item.Amount}, NewAmount:{item.NewAmount} Status: {item.Status}");

        }

    }

}