using System;

using System.Collections.Concurrent;

​

public class Program

{

    public static class Memory

    {

        public static ConcurrentDictionary<string, long> BankEntities;

    }

​

    public static void Initialize()

    {

        Memory.BankEntities = new ConcurrentDictionary<string, long>();

        Memory.BankEntities.TryAdd("A123456", 500);

        Memory.BankEntities.TryAdd("B123456", 500);

        Memory.BankEntities.TryAdd("C123456", 500);

    }

​

    public static void Main()

    {

        Initialize();

        var quit = false;

        while (!quit)

        {

            Console.WriteLine("Input operation command:");

            string input = Console.ReadLine();

            if (input.Length == 0)

            {

                Console.WriteLine("A123456 Bal: {0}\nB123456 Bal: {1}\nC123456 Bal: {2}", GetBalance("A123456"), GetBalance("B123456"), GetBalance("C123456"));

            }

            else if (input.Trim() == "q")

            {

                quit = true;

            }

            else

            {

                string[] args = input.Split(',');

                String fromAcct = args[0];

                String toAcct = args[1];

                long fund = Convert.ToInt64(args[2]);

                Tuple<int, string> result = transferMoney(fromAcct, toAcct, fund);

                Console.WriteLine(result.Item2 + '\n');

            }

        }

    }

​

    public static Tuple<int, string> transferMoney(String fromAccount, String toAccount, long fund)

    {

        //"result" variable is a return message, you may set any return message.

        Tuple<int, string> result = new Tuple<int, string>(-1, "Error");

        Console.WriteLine("\nBefore Transfer\n{0} Bal: {1}\n{2} Bal: {3}", fromAccount, GetBalance(fromAccount), toAccount, GetBalance(toAccount));

        //Complete your coding here

​

        //

        Console.WriteLine("\nAfter Transfer:\n{0} Bal: {1}\n{2} Bal: {3}", fromAccount, GetBalance(fromAccount), toAccount, GetBalance(toAccount));

        result = new Tuple<int, string>(1, "Success");

        return result;

    }

​

    public static long GetBalance(String accountNo)

    {

        long balance = 0;

        if (Memory.BankEntities.ContainsKey(accountNo))

        {

            balance = (long)Memory.BankEntities[accountNo];

        }

​

        return balance;

    }

​

    public static void UpdateBalance(String accountNo, long balance)

    {

        if (Memory.BankEntities.ContainsKey(accountNo))

        {

            Memory.BankEntities[accountNo] = balance;

        }

    }

}