这是一个示例（与代码使用的示例相同）
当从 1 级更改为 2 级时，代码开始搞砸，发生了巨大的混乱，我根本不明白。
这是代码
Public Class Node
Public label As Byte
Public visited As Boolean = False
Public level As Integer
Public Sub New(ByVal label As Byte, ByVal level As Integer)
Me.label = label
Me.level = level
End Sub
End Class
Public rootNodes As New List(Of Node)
Public nodes As New List(Of Node)
Dim adjMatrix As Byte(,)
Dim setDimensions As Boolean = False
Public Sub connectNode(ByVal start As Node, ByVal endd As Node)
'This method will be called to make connect two nodes
If setDimensions = False Then
ReDim Preserve adjMatrix(999 - 1, 999)
setDimensions = True
End If
Dim startIndex As Integer = nodes.IndexOf(start)
Dim endIndex As Integer = nodes.IndexOf(endd)
adjMatrix(startIndex, endIndex) = 1
adjMatrix(endIndex, startIndex) = 1
End Sub
Private Function getUnvisitedChildNode(ByVal n As Node) As Node
Dim index As Integer = nodes.IndexOf(n)
Dim j As Integer = 0
Do While j < nodes.Count
If adjMatrix(index, j) = 1 AndAlso nodes(j).visited = False Then
Return nodes(j)
End If
j += 1
Loop
Return Nothing
End Function
Private Sub clearNodes()
For Each n As Node In nodes
n.visited = False
Next
End Sub
Private Sub printNode(ByVal n As Node)
Debug.Print(n.label & " ")
End Sub
Public Enum Operation
LessThan = 0
GreaterThan = 1
End Enum
Public Function getPossibleNumbersForFirstByte(ByVal op As Operation, ByVal operationOf As Byte, ByVal numbersAlreadyUsed As List(Of Byte), ByVal totalSize As Long) As List(Of Byte)
Dim possibleNumbers As New List(Of Byte)
Dim tempNumber As Integer = -1
While True
If op = Operation.LessThan Then
tempNumber = IIf(tempNumber = -1, operationOf - 1, tempNumber - 1)
ElseIf op = Operation.GreaterThan Then
tempNumber = IIf(tempNumber = -1, operationOf + 1, tempNumber + 1)
End If
If tempNumber < 1 OrElse tempNumber > totalSize Then
Exit While
End If
If numbersAlreadyUsed Is Nothing OrElse numbersAlreadyUsed.Contains(tempNumber) = False Then
possibleNumbers.Add(tempNumber)
End If
End While
Return possibleNumbers
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
test()
End Sub
Sub test()
'Dim actualNumbers() As Byte = {5, 6, 1, 9, 7, 3, 8, 2, 4, 10}
Dim actualNumberList As New List(Of Byte)
actualNumberList.AddRange({5, 6, 1, 9, 7, 3, 8, 2, 4, 10})
Dim ListofGTLT() As Byte = {1, 0, 1, 0, 0, 1, 0, 1, 1}
Dim firstNumber As Byte = actualNumberList(0)
Dim possibleNumbersToUse As New List(Of Byte)
Dim numbersAlreadyUsed As New List(Of Byte)
For currentLevel = 0 To UBound(ListofGTLT)
'clear visited nodes.
clearNodes()
If currentLevel = 0 Then
'Generates Level 0 of all possible values in the first offset.
possibleNumbersToUse = getPossibleNumbersForFirstByte(ListofGTLT(currentLevel), firstNumber, Nothing, 10)
Dim n As Node
'Generates parent nodes of all possible values in the first offset.
For Each possibleNumber As Byte In possibleNumbersToUse
n = New Node(possibleNumber, 0)
rootNodes.Add(n)
nodes.Add(n)
Next
Else
Dim rootNode As Node
For Each rootNode In rootNodes
'Clear numbers already used.
numbersAlreadyUsed.Clear()
'Set already exists first value (known value).
numbersAlreadyUsed.Add(firstNumber)
If currentLevel = 1 Then
'Gets all the numbers which are possible connections.
possibleNumbersToUse = getPossibleNumbersForFirstByte(ListofGTLT(currentLevel), rootNode.label, numbersAlreadyUsed, 10)
Dim n As Node
'Setup connections with new nodes to root node.
For Each value As Byte In possibleNumbersToUse
n = New Node(value, 1)
nodes.Add(n)
'Debug.Print("[Connection]: " & rootNode.label & " = " & n.label)
connectNode(rootNode, n)
Next
Else
numbersAlreadyUsed.Add(rootNode.label)
Dim child = getUnvisitedChildNode(rootNode)
Do While child IsNot Nothing
Debug.Print("------------------------------------------")
Debug.Print("| Root = " & rootNode.label)
Debug.Print("| Child Level = " & child.level)
Debug.Print("| Child = " & child.label)
Debug.Print("------------------------------------------")
'Add to already existing values the child connection node.
If numbersAlreadyUsed.Contains(child.label) = False Then
If child.level = (currentLevel - 1) Then
'Gets next possible numbers which are possible connections.
possibleNumbersToUse = getPossibleNumbersForFirstByte(ListofGTLT(currentLevel), child.label, numbersAlreadyUsed, 10)
Dim n As Node
'Setup connections with new nodes to child node.
For Each value As Byte In possibleNumbersToUse
n = New Node(value, currentLevel)
nodes.Add(n)
connectNode(child, n)
Next
If child.level = 1 Then
'Finish all the level 1 childs for the current Root Node.
child.visited = True
child = getUnvisitedChildNode(rootNode)
Continue Do
Else
numbersAlreadyUsed.Add(child.label)
child.visited = True
child = getUnvisitedChildNode(child)
Continue Do
End If
Else
numbersAlreadyUsed.Add(child.label)
child.visited = True
child = getUnvisitedChildNode(child)
Continue Do
End If
Else
numbersAlreadyUsed.Add(child.label)
child.visited = True
child = getUnvisitedChildNode(child)
Continue Do
End If
Loop
End If
Next
End If
Next
End Sub