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  1. using System;
  2.  
  3. using System.Collections.Generic;
  4.  
  5. using System.Linq;
  6.  
  7. using System.Text;
  8.  
  9.  
  10.  
  11. namespace ConsoleApplication1
  12.  
  13. {
  14.  
  15.     class Program
  16.  
  17.     {
  18.  
  19.         static void Main(string[] args)
  20.  
  21.         {
  22.  
  23.             string metachars = "abcde";
  24.  
  25.             for (int i = 1; i <= metachars.Length; i++)
  26.  
  27.             {
  28.  
  29.                 foreach (string s in foo(metachars, i))
  30.  
  31.                 {
  32.  
  33.                     Console.WriteLine(s);
  34.  
  35.                 }
  36.  
  37.             }
  38.  
  39.         }
  40.  
  41.  
  42.  
  43.         static IEnumerable<string> foo(string metachars, int i)
  44.  
  45.         {
  46.  
  47.             var query = metachars.Select(x => x.ToString().AsEnumerable());
  48.  
  49.             while (query.First().Count() < i)
  50.  
  51.                 query = query.SelectMany(x => metachars.Where(y => y > x.Last()).Select(y => x.Concat(y.ToString().AsEnumerable())));
  52.  
  53.             return query.Select(x => string.Join(",", x));
  54.  
  55.         }
  56.  
  57.     }
  58.  
  59. }
Success #stdin #stdout 0.05s 24048KB
comments (?)
stdin
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Standard input is empty
stdout
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a
b
c
d
e
a,b
a,c
a,d
a,e
b,c
b,d
b,e
c,d
c,e
d,e
a,b,c
a,b,d
a,b,e
a,c,d
a,c,e
a,d,e
b,c,d
b,c,e
b,d,e
c,d,e
a,b,c,d
a,b,c,e
a,b,d,e
a,c,d,e
b,c,d,e
a,b,c,d,e
https://ideone.com/BDTcZ5
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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