【你有更好的算法吗？】合并重叠时间段算法

public   class  bw22617
    {
         private  List < Betime >  timeList  =   new  List < Betime > () { 
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 10 , 55 , 0 ),EndTime = new  DateTime( 2011 , 3 , 1 , 11 , 34 , 0 )},
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 13 , 9 , 34 ),EndTime = new  DateTime( 2011 , 3 , 1 , 17 , 45 , 23 )},
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 14 , 23 , 12 ),EndTime = new  DateTime( 2011 , 3 , 1 , 15 , 24 , 14 )},
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 7 , 38 , 56 ),EndTime = new  DateTime( 2011 , 3 , 1 , 10 , 34 , 45 )},
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 6 , 10 , 58 ),EndTime = new  DateTime( 2011 , 3 , 1 , 8 , 15 , 28 )},
             new  Betime{BeginTime = new  DateTime( 2011 , 3 , 1 , 16 , 14 , 25 ),EndTime = new  DateTime( 2011 , 3 , 1 , 17 , 52 , 15 )}
        };

         public   void  Union()
        {
             // 先对数据排序
            timeList  =  timeList.OrderBy(p  =>  p.BeginTime).ToList < Betime > ();
             for  ( int  i  =   0 ; i  <  timeList.Count - 1 ;i ++  )
            {
                 int  j = i + 1 ;
                 if  (timeList[i].EndTime  >=  timeList[j].BeginTime)
                {
                     // 处理后一条数据的结束时间比前一条数据结束时间小的情况
                     if  (timeList[i].EndTime  >=  timeList[j].EndTime)
                    {
                        timeList[j]  =  timeList[i];
                    }
                     else
                    {
                        timeList[j].BeginTime  =  timeList[i].BeginTime;
                    }
                    timeList[i]  =   null ;
                }
                 else
                {
                    i ++ ;
                }
            }

            timeList.ForEach(
                 delegate (Betime p)
                {
                     if  (p  !=   null )
                    {
                        Console.WriteLine( " BeginTime:  " + p.BeginTime + " \tEndTime:  " + p.EndTime);
                    }
                }
            );
        }
    }
     public   class  Betime
    {
         public  DateTime BeginTime {  get ;  set ; }
         public  DateTime EndTime {  get ;  set ; }
    }

         static   void  Main( string [] args)
        {
            bw22617 test  =   new  bw22617();
            test.Union();
            Console.Read();
        }