using System;

using System.Collections.Generic;

using System.Linq;

​

public class Meeting

{

    public int StartTime

    {

        get;

        set;

    }

​

    public int EndTime

    {

        get;

        set;

    }

​

    public Meeting(int startTime, int endTime)

    {

        // Number of 30 min blocks past 9:00 am

        StartTime = startTime;

        EndTime = endTime;

    }

​

    public override string ToString()

    {

        return string.Format("({0}, {1})", StartTime, EndTime);

    }

​

    public static List<Meeting> MergeRanges(List<Meeting> meetings)

    {

        List<Meeting> mergedMeetings = new List<Meeting>();

        try

        {

            meetings = meetings.OrderBy(x => x.StartTime).ToList();

            foreach (var meeting in meetings)

            {

                if (mergedMeetings.Count() > 0)

                {

                    if (meeting.StartTime <= mergedMeetings.Last().EndTime)

                    {

                        mergedMeetings.Last().EndTime = Math.Max(meeting.EndTime, mergedMeetings.Last().EndTime);

                    }

                    else

                    {

                        mergedMeetings.Add(meeting);

                    }

                }

                else

                {

                    mergedMeetings.Add(meeting);

                }

            }

        }

        catch (System.SystemException ex)

        {

            throw ex;

        }

​

        return mergedMeetings;

    }

    public static void Main()

    {

        List<Meeting> meetings = new List<Meeting>{ new Meeting(0, 1), new Meeting(3, 5), new Meeting(4, 8), new Meeting(10, 12), new Meeting(9, 10) };

        foreach(var meeting in Meeting.MergeRanges(meetings))

        {

            System.Console.WriteLine(meeting);

        }

    }

}