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重複順列
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using System; | |
using System.Collections.Generic; | |
namespace RQN | |
{ | |
public static class RepeatedPermutation | |
{ | |
/// <summary> | |
/// 指定した文字を使用して、指定した長さの重複順列を生成します。 | |
/// </summary> | |
public static IEnumerable<string> Generate(char[] chars, int length) | |
{ | |
int loopCount = (int)Math.Pow(chars.Length, length); | |
int[] numAry = new int[length]; | |
for (int i = 0; i < loopCount; i++) | |
{ | |
string str = ""; | |
for (int j = length; j > 0; j--) | |
{ | |
str += chars[numAry[j - 1]]; | |
} | |
yield return str; | |
int digit = 0; // 桁 | |
while (true) | |
{ | |
if (numAry[digit] != chars.Length - 1) // !最大値 | |
{ | |
numAry[digit]++; | |
break; | |
} | |
else | |
{ | |
if (digit != length - 1) // !最大桁 | |
{ | |
numAry[digit] = 0; | |
digit++; | |
} | |
else | |
{ | |
break; | |
} | |
} | |
} | |
} | |
} | |
} | |
} |
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using System; | |
namespace ConsoleApplication1 | |
{ | |
class Program | |
{ | |
static void Main(string[] args) | |
{ | |
char[] keys = { 'a', 'b', 'c' }; | |
foreach (var word in RQN.RepeatedPermutation.Generate(keys, 3)) | |
{ | |
Console.WriteLine(word); | |
} | |
// 出力 | |
// aaa | |
// aab | |
// aac | |
// aba | |
// abb | |
// ... | |
// cca | |
// ccb | |
// ccc | |
} | |
} | |
} |
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