総当りプログラム

Bruteforce.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Bruteforce
{
  class Program
	{
		const string letters = "0123456789abcdef";

		static void Main(string[] args)
		{
			foreach (var str in Bruteforce(letters, 4))
			{
				Console.WriteLine(str);
			}
		}

		public static IEnumerable<string> Bruteforce(string letters,int len)
		{
			var num = new List<int>(new[] { -1 });
			while (true)
			{
				int p = 0;
				while (true)
				{
					if (p == num.Count)
						num.Add(0);
					if (num.Count > len)
						yield break;
					num[p]++;
					if (num[p] >= letters.Length)
					{
						num[p] = 0;
						p++;
						continue;
					}
					break;
				}
				yield return new string(num.Select(s => letters[s]).Reverse().ToArray());
			}
		}
	}
}