//Rextester.Program.Main is the entry point for your code. Don't change it.

//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;

using System.Collections.Generic;

​

namespace Rextester

{

    public class Program

    {

        public static void Main(string[] args)

        {

            //Your code goes here

            Office ofc1 = new Office();

            ofc1.isHeadQuater = true;

            ofc1.officeLocation = Location.Belfast;

            ofc1.department = new Department("HR");

            Office ofc2 = new Office();

            ofc2.isHeadQuater = false;

            ofc2.officeLocation = Location.London;

            ofc2.department = new Department("ACCOUNTS");

            Company c1 = new Company();

            c1.AddOffice(ofc1);

            c1.AddOffice(ofc2);

            Office ofc3 = new Office();

            ofc3.isHeadQuater = true;

            c1.AddOffice(ofc3);

            Console.WriteLine(c1.office.Count);

        }

​

        public enum Location

        {

            London,

            Manchester,

            Belfast

        }

​

        public class Office

        {

            public Department department

            {

                get;

                set;

            }

​

            public Location officeLocation;

            public bool isHeadQuater

            {

                get;

                set;

            }

        }

​

        public class Department

        {

            public Department(string d)

            {

                departmentName = d;

            }

​

            public string departmentName

            {

                get;

                set;

            }

​

            public Employee Manager

            {

                get;

                set;

            }

        }

​

        public class Employee

        {

            public Employee[] recruitedBy

            {

                get;

                set;

            }

​

            public string Name;

        }

​

        public class Company

        {

            public List<Office> office = new List<Office>();

            public void AddOffice(Office off)

            {

                if (office.Count == 0)

                {

                    office.Add(off);

                }

                else

                {

                    if (office.Exists(ofc => ofc.isHeadQuater == true) && off.isHeadQuater == true)

                    {

                        Console.WriteLine("Already one ofc with headquarter set");

                        return;

                    }

                    else

                        office.Add(off);

                }

            }

        }

    }

}