在教排列組合時, 常常會想要看排列的情形, 3!, 4! 還可以用人工列出來, 5!, 6! 可就麻煩了, 偶然發現以下的Excel VBA , 還不錯, 給大家參考!
http://spreadsheetpage.com/index.php/tip/generating_permutations/
Dim CurrentRow
Sub GetString()
Dim InString As String
InString = InputBox("Enter text to permute:")
If Len(InString) < 2 Then Exit Sub
If Len(InString) >= 8 Then
MsgBox "Too many permutations!"
Exit Sub
Else
ActiveSheet.Columns(1).Clear
CurrentRow = 1
Call GetPermutation("", InString)
End If
End Sub
Sub GetPermutation(x As String, y As String)
' The source of this algorithm is unknown
Dim i As Integer, j As Integer
j = Len(y)
If j < 2 Then
Cells(CurrentRow, 1) = x & y
CurrentRow = CurrentRow + 1
Else
For i = 1 To j
Call GetPermutation(x + Mid(y, i, 1), _
Left(y, i - 1) + Right(y, j - i))
Next
End If
End Sub
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本帖最後由 荷荷葩 於 2014-9-10 11:11 PM 編輯 ]
