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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. class Program
  5. {
  6.     static void Main(string[] args)
  7.     {
  8.         var histogram = new Dictionary<string, int>{{"ABC", 0}, {"ACB", 0}, {"BAC", 0}, {"BCA", 0}, {"CAB", 0}, {"CBA", 0}};
  9.  
  10.         for(int i = 0; i < 3; i++)
  11.             for(int j = 0; j < 3; j++)
  12.                 for(int k =0; k < 3; k++)
  13.                 {
  14.                     var sc = new SwappableChars("ABC");
  15.                     sc.Swap(0, i); sc.Swap(1, j); sc.Swap(2, k);
  16.                     histogram[sc.ToString()] += 1;
  17.                 }
  18.  
  19.         foreach (var x in histogram) Console.WriteLine("{0}: {1}", x.Key, x.Value);
  20.     }
  21. }
  22.  
  23. public class SwappableChars
  24. {
  25.     private char[] mChars;
  26.  
  27.     public SwappableChars(string text)
  28.     {
  29.         mChars = text.ToCharArray();
  30.     }
  31.  
  32.     public void Swap(int i, int j)
  33.     {
  34.         var hoge = mChars[i];
  35.         mChars[i] = mChars[j];
  36.         mChars[j] = hoge;
  37.     }
  38.  
  39.     public override string ToString()
  40.     {
  41.         return new string(mChars);
  42.     }
  43. }
Success #stdin #stdout 0.03s 33848KB
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stdin
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Standard input is empty
stdout
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ABC: 4
ACB: 5
BAC: 5
BCA: 5
CAB: 4
CBA: 4
https://ideone.com/crwsk4
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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