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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4.  
  5. namespace ConsoleApplication3
  6. {
  7.     class Program
  8.     {
  9.         static void Main(string[] args)
  10.         {
  11.             Random rnd = new Random(123);
  12.  
  13.             LinkedList<int> list = new LinkedList<int>();
  14.             for (int i = 0; i < 25; i++)
  15.             {
  16.                 list.AddLast(rnd.Next(0, 5));
  17.             }
  18.             Console.WriteLine("До:");
  19.             foreach (var i in list)
  20.             {
  21.                 Console.WriteLine(i);
  22.             }
  23.             Console.WriteLine();
  24.             LinkedListNode<int> node;
  25.             node = list.First;
  26.             while (node != null)
  27.             {
  28.                 int prev = -9999;
  29.                 int next = -99;
  30.                 if (node.Previous != null)
  31.                 {
  32.                     prev = node.Previous.Value;
  33.                 }
  34.                 if (node.Next != null)
  35.                 {
  36.                     next = node.Next.Value;
  37.                 }
  38.                 var nextNode = node.Next;
  39.                 if (node.Value == prev || prev == next || node.Value == next)
  40.                 {
  41.                     Console.WriteLine("DELETE: Prev:{0} ,Curr:{1}, Next:{2}", prev, node.Value, next);
  42.                     //Удаление элемента
  43.                     list.Remove(node);
  44.                 }
  45.                 node = nextNode;
  46.             }
  47.  
  48.             Console.WriteLine();
  49.  
  50.             Console.WriteLine("После:");
  51.  
  52.             foreach (var i in list)
  53.             {
  54.                 Console.WriteLine(i);
  55.             }
  56.  
  57.             Console.ReadKey();
  58.         }
  59.     }
  60. }
Success #stdin #stdout 0.04s 24264KB
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stdin
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Standard input is empty
stdout
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До:
4
3
1
4
4
0
0
2
4
3
0
4
2
4
0
0
1
0
0
1
3
4
2
3
1

DELETE: Prev:1 ,Curr:4, Next:4
DELETE: Prev:4 ,Curr:0, Next:0
DELETE: Prev:4 ,Curr:2, Next:4
DELETE: Prev:4 ,Curr:4, Next:0
DELETE: Prev:4 ,Curr:0, Next:0
DELETE: Prev:0 ,Curr:1, Next:0
DELETE: Prev:0 ,Curr:0, Next:0
DELETE: Prev:0 ,Curr:0, Next:1

После:
4
3
1
4
0
2
4
3
0
4
0
1
3
4
2
3
1
https://ideone.com/9vLN8G
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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