using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication2

 {

     class Program

     {

         static void Main(string[] args)

         {

             List<int> list1 = new List<int> { , ,  };

             List<int> list2 = new List<int> { , ,  };

             List<int> list3 = new List<int> { , ,  };

             List<int> list4 = new List<int> { , ,  };

             List<int> list5 = new List<int> { , ,  };

             List<int> list6 = new List<int> { , ,  };

             List<int> list7 = new List<int> { , ,  };

             List<List<int>> list = new List<List<int>>();

             list.Add(list1);

             list.Add(list2);

             list.Add(list3);

             list.Add(list4);

             list.Add(list5);

             list.Add(list6);

             list.Add(list7);

             List<int> allint = new List<int>();//所有的集合数据

             HashSet<int> repeated = new HashSet<int>(); //得到没有重复的hashset

             foreach (List<int> item in list)

             {

                 foreach (int index in item)

                 {

                     if (allint.Contains(index))

                         repeated.Add(index);//得到所有重复的集合的元素

                     allint.Add(index);//得到所有的集合的元素

                 }

             }

             foreach (var setkey in repeated)//循环重复的值

             {

                 List<int> templist = null;//临时

                 List<List<int>> removelist = new List<List<int>>();

                 foreach (var item in list)//循环

                 {

                     //if (templist == null)

                     //{

                     //    templist = item;

                     //    removelist.Add(item);

                     //}

                     //if (item.Contains(setkey))

                     //{

                     //    removelist.Add(item);

                     //    templist = templist.Union(item).ToList();

                     //}

                     if (item.Contains(setkey))

                     {

                         if (templist == null)

                         {

                             templist = item;

                             removelist.Add(item);

                         }

                         else

                         {

                             removelist.Add(item);

                             templist = templist.Union(item).ToList();

                         }

                     }

                 }

                 foreach (var item in removelist)

                 {

                     list.Remove(item);

                 }

                 removelist.Clear();

                 list.Add(templist);

             }

             foreach (var item in list)

             {

                 foreach (var item1 in item)

                 {

                     Console.Write(item1 + " , ");

                 }

                 Console.Write("\r\n");

             }

             Console.ReadKey();

         }

     }

 }