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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var nums = new List<string>();
  10.     	for (var i = 0L; i <= 99999L; i += 101)
  11.     	{
  12.     		var s = i.ToString().PadLeft(9, '0');
  13.     		if (!nums.Any(n => LessThan2SequentialCharsDiff(n, s)))
  14.     			nums.Add(s);
  15.     		else
  16.     			Console.WriteLine("Not valid: " + s);
  17.     		if (i % 10000L < 101) Console.WriteLine(i);
  18.     	}
  19.     	Console.WriteLine("Count: " + nums.Count);
  20. 	}
  21.  
  22.     public static bool LessThan2SequentialCharsDiff(string a, string b)
  23.     {
  24.         var diffCount = 0;
  25.     	var timesCount = 0;
  26.     	var isSequential = false;
  27.     	for (var i = 0; i < a.Length && diffCount <= 2 && timesCount <= 1; i++)
  28.     		if (a[i] != b[i])
  29.     		{
  30.     			if (!isSequential) timesCount++;
  31.     			diffCount++;
  32.     			isSequential = true;
  33.     		}
  34.     		else
  35.     		{
  36.     			diffCount = 0;
  37.     			isSequential = false;
  38.     		}
  39.     	return diffCount <= 2 && timesCount <= 1;
  40.     }
  41. }
Success #stdin #stdout 0.14s 34088KB
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https://ideone.com/lFHnlX
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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