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VB.net にいくつかの配列があります。これらの配列は長さが異なるため、それらを組み合わせる必要があります。簡単な解決策は、例のようにネストされたループを使用することです。

Dim Array1= {10, 11, 12}
Dim Array2= {15}
Dim Array3= {1,2,3}
Dim array(2) As Object
array(0) = Array1
array(1) = Array2
array(2) = Array3

for (a = 1 to < Array1.Length - 1) 
    for (b = 1 to < Array2.Length - 1) 
        for (c = 1 to < Array3.Length - 1)            
             'Get combination
          Next
      Next
 Next

Output: {10,15,1},{10,15,2},{10,15,3},{11,15,1},{11,15,2},...

しかし、実際の問題は、配列の数が固定パラメーターではないことです (例のように 3 または他の数である可能性があります)。したがって、ネストされたループは解決策ではありません。

何か案が？

4

2 に答える 2

1

これは、ほぼ 10 年前にまだ VB.Net 2003 を使用しているときに書いたコードの一部を簡単に書き直したものです...私のハード ドライブには素晴らしい思い出があります!

その出力が役に立つことを願っています：

10,15,1
10,15,2
10,15,3
11,15,1
11,15,2
11,15,3
12,15,1
12,15,2
12,15,3

それを生成したコード:

Public Class Form1

    Private WithEvents FC As ArrayCombinations = Nothing

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        If IsNothing(FC) Then
            FC = New ArrayCombinations
            FC.AddArray(New Integer() {10, 11, 12})
            FC.AddArray(New Integer() {15})
            FC.AddArray(New Integer() {1, 2, 3})
            FC.GenerateCombos()
        End If
    End Sub

    Private Sub FC_combinations(combos As System.Collections.Generic.List(Of System.Collections.Generic.List(Of Integer))) Handles FC.Combinations
        For Each combo As List(Of Integer) In combos
            Debug.Print(String.Join(",", combo.Select(Function(i) i.ToString())))
        Next
        FC = Nothing
    End Sub

End Class

Public Class ArrayCombinations

    Private Arrays As New List(Of Integer())
    Private WithEvents BGW As New System.ComponentModel.BackgroundWorker
    Public Event Combinations(ByVal combos As List(Of List(Of Integer)))

    Public Sub New()
        BGW.WorkerReportsProgress = True
    End Sub

    Public Sub AddArray(ByVal values() As Integer)
        If Not BGW.IsBusy Then
            Arrays.Add(values)
        End If
    End Sub

    Public Sub GenerateCombos()
        If Not BGW.IsBusy Then
            BGW.RunWorkerAsync()
        End If
    End Sub

    Private Sub BGW_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BGW.DoWork
        Dim sizes As New List(Of Integer)
        Dim combinations As Integer
        Dim remainder As Integer
        Dim quotient As Integer
        Dim combination As List(Of Integer)
        Dim combos As New List(Of List(Of Integer))

        If Arrays.Count > 0 Then
            combinations = 1
            For Each factor() As Integer In Arrays
                sizes.Add(factor.Count)
                combinations = combinations * factor.Count
            Next

            For i As Integer = 0 To combinations - 1
                combination = New List(Of Integer)
                For j As Integer = 1 To Arrays.Count
                    combination.Add(Nothing)
                Next

                quotient = i \ sizes.Item(sizes.Count - 1) ' Integer Division
                remainder = i Mod sizes.Item(sizes.Count - 1)

                combination(Arrays.Count - 1) = Arrays.Item(Arrays.Count - 1)(remainder)
                For j As Integer = (sizes.Count - 2) To 0 Step -1
                    combination.Item(j) = Arrays.Item(j)(quotient Mod sizes.Item(j))
                    quotient = quotient \ sizes.Item(j) ' Integer Division
                Next
                combos.Add(combination)
            Next

            e.Result = combos
        End If
    End Sub

    Private Sub BGW_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BGW.RunWorkerCompleted
        RaiseEvent Combinations(e.Result)
    End Sub

End Class
于 2013-10-09T20:33:07.437 に答える