Our Combination code in Visual Basic.
Combination Class File:
Public Class Combination
Public words As New List(Of String)
Public r As Integer ' min length Of word
Protected comb_store
Private i As Integer
' point of entry
Public Function possibleWordCombinations(candidates As List(Of String), size As Integer) As List(Of String())
words = candidates
r = size
comb_store = New List(Of String())
i = 0
' check for conformity
If r <= 0 Or r > words.Count Then
comb_store = New List(Of String())
ElseIf r = 1 Then
For i = 0 To words.Count - 1
comb_store.Add(New String() {words(i)})
Next i
Else
progressiveCombination()
End If
Return comb_store
End Function
' do combinations for all 'words' element
Private Sub progressiveCombination()
' single member list
repetitivePairing(New List(Of String)({words(i)}), i + 1)
If i + r <= words.Count Then
' move on to next degree
i += 1
progressiveCombination()
End If
End Sub
' do all possible combinations for 1st element of this array
Private Sub repetitivePairing(prefix As List(Of String), position As Integer)
Dim auxiliary_store(words.Count - position) As List(Of String)
For j As Integer = 0 To words.Count - position - 1
' check if desired -- r -- size will be realised
If r - prefix.Count <= words.Count - position Then
auxiliary_store(j) = New List(Of String)
auxiliary_store(j).AddRange(prefix)
auxiliary_store(j).Add(words(position))
If auxiliary_store(j).Count < r Then
' see to adding next word on
repetitivePairing(auxiliary_store(j), position + 1)
Else
comb_store.Add(auxiliary_store(j).ToArray())
End If
End If
position += 1
Next j
End Sub
End ClassMain Class:
Module Miscellaneous_Combination
Sub Main()
Dim goods As List(Of String)
goods = New List(Of String)(New String() {"Eno", "Chidi", "Olu", "Ahmed", "Osas", "Gbeda"})
Dim combo As New Combination
Dim result As List(Of String()) = combo.possibleWordCombinations(goods, 3)
' print choices and operation
Console.Write("[ ")
For Each choice As String In combo.words
Console.Write(choice & "; ")
Next
Console.WriteLine("] combination " & combo.r & ":" & Environment.NewLine)
' print out combinations 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)
