using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<Transaction> transactions = new List<Transaction>

        {

            // These transactions should trigger the suspicious activity for CustomerID 1

            new Transaction { TransactionID = 1, CustomerID = 1, Timestamp = DateTime.Now.AddDays(-2).AddHours(-1), Amount = 10500m, TransactionType = "Deposit" },

            new Transaction { TransactionID = 2, CustomerID = 1, Timestamp = DateTime.Now.AddDays(-2).AddHours(1), Amount = 11000m, TransactionType = "Deposit" },

            new Transaction { TransactionID = 3, CustomerID = 1, Timestamp = DateTime.Now.AddDays(-2).AddHours(2), Amount = 12000m, TransactionType = "Withdrawal" },

            // Other transactions not triggering the suspicious activity

            new Transaction { TransactionID = 4, CustomerID = 2, Timestamp = DateTime.Now.AddMonths(-2), Amount = 5000m, TransactionType = "Deposit" },

            new Transaction { TransactionID = 5, CustomerID = 2, Timestamp = DateTime.Now.AddDays(-15), Amount = 7000m, TransactionType = "Withdrawal" },

        };

​

​

        // Step 1: Calculate the total number and total amount of transactions for each type

        var transactionsByType = transactions

            .GroupBy(t => t.TransactionType)

            .Select(g => new