一个排列组合算法, 生成四位数字的随机数

[as86238582]

必须有abc, 0-9的四位随机数密码
例如 abc0
1abc
ab2c

abc摆放位置随机...没硬性规定.
用数组实现

[threenewbee]

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 1; i < 100; i++)
            Console.WriteLine(RandNum());
        }

        static string RandNum()
        {
            var rnd1 = "abc".OrderBy(x => Guid.NewGuid()).ToArray();
            var r = new Random(Guid.NewGuid().GetHashCode());
            int rnd2 = r.Next(0, 4);
            int rnd3 = r.Next(0, 10);
            return new string(rnd1.Take(rnd2).ToArray()) + rnd3.ToString() + new string(rnd1.Skip(rnd2).ToArray());
        }
    }
}

[SQL77]

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int i=1;
            while (i <= 100)
            {
                Random r = new Random();
                int rand = r.Next(10);
                string s = "abc" + rand.ToString();
                char[] ch = s.ToCharArray();
                string result = "";
                while (result.Length < 4)
                {
                    Random randtemp = new Random();
                    int rtemp = randtemp.Next(ch.Length);
                    if (result.IndexOf(ch[rtemp].ToString()) == -1)
                    {
                        result += ch[rtemp].ToString();
                    }
                }
                Console.WriteLine(result);
                i++;
            }
            
            Console.ReadKey();
        }
    }
}

[Hauk]

            string str = "abc";
            Random rand = new Random();
            str = str.Insert(rand.Next(4), rand.Next(10).ToString());
            Console.WriteLine(str);

[as86238582]

引用 1 楼 caozhy 的回复:

C# code?12345678910111213141516171819202122232425using System;using System.Collections.Generic;using System.Linq;using System.Text; namespace ConsoleApplication1{ class Program { ……

晕,需要abc 任意排列的情况下,在增加 0到9任意一位数字..产生一个4位数字的字典.

[as86238582]

引用 2 楼 SQL77 的回复:

C# code?123456789101112131415161718192021222324252627282930313233343536using System;using System.Collections.Generic;using System.Linq;using System.Text; namespace ConsoleApplication1{ ……

晕,需要abc 任意排列的情况下,在增加 0到9任意一位数字..产生一个4位数字的字典. abc 不需要固定位置.. 0到9,任意一位数字插入到abc中... 题目我写的很清楚啊. 0acb 1acb 2acb 3acb 4acb 5acb a9cb 7acb 8acb 9acb a9cb a1cb a9cb a3cb a4cb a5cb a6cb a7cb a8cb a9cb a9cb a9cb a9cb a9cb a9cb a9cb a9cb 例如这样.

[threenewbee]

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            foreach (string s in All())
            {
                Console.WriteLine(s);
            }
        }

        static IEnumerable<string> All()
        {
            return Enumerable.Range(0, 40).SelectMany(x => new string[] { "abc", "acb", "bac", "bca", "cab", "cba" }.Select(y => y.Insert(x / 10, (x % 10).ToString())));
        }
    }
}

[Teng_s2000]