Our Mathematical Selection code in Visual Basic.
Mathematical Selection Class File:
Public Class Selection
Public words As String()
Public r As Integer ' min length Of word
Protected complete_group
Private i As Integer
Public Function groupSelection(candidates As String(), size As Integer) As List(Of String())
words = candidates
r = size
complete_group = New List(Of String())
i = 0
recursiveFillUp(New List(Of String))
Return complete_group
End Function
' pick elements recursively
Protected Sub recursiveFillUp(temp As List(Of String))
Dim picked_elements(words.Length) As List(Of String)
Dim j As Integer = i
Do While j < words.Length
picked_elements(j) = New List(Of String)
picked_elements(j).AddRange(temp)
picked_elements(j).Add(words(j))
' recoil factor
If i >= words.Length Then
i = j
End If
' satisfied yet?
If picked_elements(j).Count = r Then
complete_group.Add(picked_elements(j).ToArray())
ElseIf picked_elements(j).Count < r Then
recursiveFillUp(picked_elements(j))
End If
j += 1
Loop
j -= 1
If picked_elements(j).Equals(Nothing) = False And picked_elements(j).Count = r Then
i += 1 ' keep recoil factor straightened out
End If
End Sub
End ClassMain Class:
Module Miscellaneous_Selection
Sub Main()
Dim goods As String() = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}
Dim pick As New Selection
Dim result As List(Of String()) = pick.groupSelection(goods, 2)
' print choices and operation
Console.Write("[ ")
For Each choice As String In pick.words
Console.Write(choice & "; ")
Next
Console.WriteLine("] selection " & pick.r & ":" & Environment.NewLine)
' print out selections nicely
Dim i = 0
For Each group As String() In result
i += 1
Console.Write(i & ": ")
For Each member As String In group
Console.Write(member & "; ")
Next
Console.WriteLine()
Next
Console.WriteLine(Environment.NewLine & "Number of ways is " & result.Count & ".")
End Sub
End ModuleTry it out!
Elegance (0.0)
