using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    public class Node
    {
        public DateTime StartTime { get; set; }
        public DateTime EndTime { get; set; }
        public bool Deleted { get; set; }
    }

    public class Test
    {
        private DateTime Min(DateTime v1, DateTime v2)
        {
            if (v1 > v2)
            {
                return v2;
            }
            return v1;
        }

        private DateTime Max(DateTime v1, DateTime v2)
        {
            if (v1 > v2)
            {
                return v1;
            }
            return v2;
        }

        public IList<Node> Run(IList<Node> list)
        {
            list = list.OrderBy(x=>x.StartTime).ToList();
            for (int i = 0; i < list.Count - 1; i++)
            {
                if (list[i].Deleted)
                {
                    continue;
                }
                for(int j = i + 1; j < list.Count; j++)
                {
                    if ((list[j].StartTime >= list[i].StartTime && list[j].StartTime <= list[i].EndTime) || (list[j].EndTime >= list[i].StartTime && list[j].EndTime <= list[i].EndTime))
                    {
                        list[i].StartTime = Min(list[i].StartTime, list[j].StartTime);
                        list[i].EndTime = Max(list[i].EndTime, list[j].EndTime);
                        list[j].Deleted = true;
                    }
                }
            }
            return list.Where(x => !x.Deleted).ToList();
        }
    }
}