using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        //Tinh trung binh

            string dp="2021-07-12 14:32:29.960";

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

            tv.Add("2021-07-12 14:32:28.659");

            tv.Add("2021-07-12 14:32:31.581");

        //  tv.Add("2021-07-12 14:22:30.446");

            string FormatDateTime = "yyyy-MM-dd HH:mm:ss.fff";

            List<DateTime> thanhvien=new List<DateTime>();

            DateTime dieuphoi=DateTime.ParseExact(dp,FormatDateTime,

                                       System.Globalization.CultureInfo.InvariantCulture);

            for (int i = 0; i < tv.Count; i++)

            {

                DateTime myDate = DateTime.ParseExact(tv[i],FormatDateTime,

                                       System.Globalization.CultureInfo.InvariantCulture);

                thanhvien.Add(myDate);

            }   

            long dem=0; 

            List<long> chinh=new List<long>();

            for (int i = 0; i < thanhvien.Count; i++)

            {

                dem+=thanhvien[i].Ticks-dieuphoi.Ticks;

                chinh.Add((thanhvien[i].Ticks-dieuphoi.Ticks)/10000);

            }

            double num=tv.Count+1;

            long Theta = (long)Math.Round((dem/10000) / num, 0, MidpointRounding.AwayFromZero);

            Console.WriteLine("Dieu phoi: " + Theta);

            for (int i = 0; i < chinh.Count; i++)

            {

                Console.WriteLine("Thanh vien "+ (i+1) + ": "+(Theta-chinh[i]));

            }

            DateTime dongbo=dieuphoi.AddTicks(Theta*10000);

            Console.WriteLine("Sau khi dong bo: "+dongbo.ToString("yyyy-MM-dd HH:mm:ss.fff"));

        }   

    }