使用嵌套递归算法vb.net显示所有多个解决方案
我的递归不是很好，我必须添加一个包含所有失败路径的列表，以便快速退出其他递归路径，如果它更聪明的话，可能不需要这样做使用嵌套递归算法vb.net显示所有多个解决方案,vb.net,recursion,Vb.net,Recursion,我的递归不是很好，我必须添加一个包含所有失败路径的列表，以便快速退出其他递归路径，如果它更聪明的话，可能不需要这样做 1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3 无论如何，我要做的是，每次检测到重复时，它要么下降到下一行，要么一直下降到顶部，并且仅在可能保持值唯一的情况下尝试填充重复值。然后我得到了一组行，它们都是唯一排序的。现在我把所有这些都编好了代码，效果很好。。问题是撤销此操作以获得相
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
0 0 0 0 1 0 1 0 0 1 0 0 1 0 0 1 0 0 0 1 1 0 0 1 0 0 1 0 0 1 1 1 1 0 0 0 1
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
(Row 0): 1 9 4 2 3 0
(Row 1): 4 2 1 3 0
(Row 2): 4 2 1 0 3
(Row 3): 2 4 3
(Row 4): 2 4 1
(Row 5): 2 3 4 0
(Row 6): 4 2 0
(Row 7): 4 1 0 2
(Row 8): 4 6 3 1
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
所有行组合成一个字符串，用于将其传递给程序
1 9 4 2 3 0 4 2 1 3 0 4 2 1 0 3 2 4 3 2 4 1 2 3 4 0 4 2 0 4 1 0 2 4 6 3 1
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
我通过按按钮2运行此功能
3个文本框
txtendoplantext.Text=“1 9 4 2 3 0 4 2 2 1 0 3 2 4 3 2 1 2 3 4 0 4 2 0 4 6 3 1”txtendobitmask.Text=“0 0 0 0 1 0 1 0 0 1 0 0 0 1 0 1 0 0 1 0 1 0 1 1 0 0 1”txtOutput（这是一个多行输出），答案打印出来。
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
0 22 0索引301 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 0 2 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
Public bitmask() As Byte
Public FailedPaths As New List(Of String)
Public Uniques()() As Byte
Public Function GetUniquesAt(uniques()() As Byte, CurrentRow As UInteger, ProcessedBits()() As Byte) As Byte()
Dim eachUniqueIndex As Integer = 0
Dim UniquesUsed() As Byte
'ReDim UniquesUsed(0)
For eachUniqueIndex = 0 To UBound(uniques(CurrentRow), 1)
If ProcessedBits(CurrentRow)(eachUniqueIndex) = 1 Then
'Add a new number to this row
If UniquesUsed Is Nothing Then
ReDim Preserve UniquesUsed(0)
Else
ReDim Preserve UniquesUsed(UniquesUsed.Length)
End If
Dim LastValueInRow As Integer = UniquesUsed.Length
UniquesUsed(LastValueInRow - 1) = uniques(CurrentRow)(eachUniqueIndex)
End If
Next
Return UniquesUsed
End Function
Public Function GetCurrentOffsetForRow(uniques()() As Byte, CurrentRow As UInteger, ProcessedBits()() As Byte) As UInteger
Dim eachUniqueIndex As Integer = 0
For eachUniqueIndex = 0 To UBound(uniques(CurrentRow), 1)
If ProcessedBits(CurrentRow)(eachUniqueIndex) = 0 Then
Return eachUniqueIndex
End If
Next
Return eachUniqueIndex
End Function
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
txtUndoPlaintext.Text = Replace(txtUndoPlaintext.Text, " ", " ")
txtUndoPlaintext.Text = txtUndoPlaintext.Text.TrimStart(CChar(" "))
txtUndoPlaintext.Text = txtUndoPlaintext.Text.TrimEnd(CChar(" "))
Dim UniqueList() As Byte = Split(txtUndoPlaintext.Text, " ").[Select](Function(n) Byte.Parse(n)).ToArray()
txtUndoBitMask.Text = Replace(txtUndoBitMask.Text, " ", " ")
txtUndoBitMask.Text = txtUndoBitMask.Text.TrimStart(CChar(" "))
txtUndoBitMask.Text = txtUndoBitMask.Text.TrimEnd(CChar(" "))
bitmask = Split(txtUndoBitMask.Text, " ").[Select](Function(n) Byte.Parse(n)).ToArray()
'Clear uniques from previous runs.
Uniques = Nothing
Dim PreviousRow As UInteger = 0
'Check if unique exists from first row to current row
Dim CurrentRow As UInteger = 0
Dim ContainsValueInRow As Boolean = False
'if uniques current row isn't initialized then initialize it.
If Uniques Is Nothing Then
ReDim Uniques(CurrentRow)
Uniques(CurrentRow) = New Byte() {}
End If
Dim ProcessedBits()() As Byte
ReDim ProcessedBits(CurrentRow)
ProcessedBits(CurrentRow) = New Byte() {}
'Load uniques up in the Uniques List
For Each Value In UniqueList
ContainsValueInRow = False
'Check row if it contains the current Value if it does change to next row.
For eachUniqueIndex = 0 To UBound(Uniques(CurrentRow), 1)
If Uniques(CurrentRow)(eachUniqueIndex) = Value Then
ContainsValueInRow = True
Exit For
End If
Next
If ContainsValueInRow Then
CurrentRow += 1
ReDim Preserve Uniques(CurrentRow)
Uniques(CurrentRow) = New Byte() {}
ReDim Preserve ProcessedBits(CurrentRow)
ProcessedBits(CurrentRow) = New Byte() {}
End If
Dim LastValueInRow As Integer = Uniques(CurrentRow).Length
'Add new number to this row
ReDim Preserve Uniques(CurrentRow)(LastValueInRow)
Uniques(CurrentRow)(LastValueInRow) = Value
ReDim Preserve ProcessedBits(CurrentRow)(LastValueInRow)
ProcessedBits(CurrentRow)(LastValueInRow) = 0
Next
FailedPaths.Clear()
CurrentRow = 0
Dim CurrentProcessedByte As Long = 0
Dim CurrentOffset As Long = 0
Dim FinalString As String = ""
Dim ExitedTooSoon As Boolean = False
ProcessTreeNodes(FinalString, ProcessedBits, CurrentProcessedByte, PreviousRow, CurrentRow)
Dim output As String
output = output & "Final Decoded Answer: " & FinalString & vbCrLf
output = output & "Stopped at row: " & CurrentRow & vbCrLf
txtOutput.Text = txtOutput.Text & output
End Sub
Public Sub ProcessTreeNodes(_FinalString As String, _ProcessedBits()() As Byte, CurrentProcessedByte As Byte, PreviousRow As UInteger, CurrentRow As UInteger)
'Clone Data to get rid of References, so we always copy here
Dim ProcessedBits(_ProcessedBits.GetUpperBound(0))() As Byte
For i = 0 To _ProcessedBits.Length - 1
ProcessedBits(i) = _ProcessedBits(i).Clone()
Next
Dim FinalString As String = _FinalString.Clone()
Dim LoopTwo As Boolean = False
Dim ExitedTooSoon As Boolean = False
Dim CurrentOffset As UInteger = GetCurrentOffsetForRow(Uniques, CurrentRow, ProcessedBits)
While True
'If finished with everything just simply exit this loop
If bitmask.Length = CurrentProcessedByte Then Exit While
'Unique currently on this row no need any extra processing
If bitmask(CurrentProcessedByte) = 0 Then
'Bad Sub Node.. exit it
If Uniques(CurrentRow).Length = CurrentOffset Then
ExitedTooSoon = True
Exit While
End If
FinalString = FinalString & " " & Uniques(CurrentRow)(CurrentOffset)
'Mark as processed for future calculations
ProcessedBits(CurrentRow)(CurrentOffset) = 1
End If
'Switch to a new row
If bitmask(CurrentProcessedByte) = 1 Then
CurrentOffset = 0
PreviousRow = CurrentRow
'If Blank Row -> Build a next Row Or Start from Top.
'If the row is Row 0, then next row is Row 1, but if Row 1.. then next row to check is Row 0 etc..
If CurrentRow = 0 Then
CurrentRow = 1
ElseIf CurrentRow > 0 Then
CurrentRow = 0
End If
Dim MainRowUniquesUsed() As Byte
Dim CurrentRowUniques() As Byte
'Do crazy loop checks to see whats the next value.
While True
If FailedPaths.Contains(FinalString) Then
ExitedTooSoon = True
Exit While
End If
MainRowUniquesUsed = GetUniquesAt(Uniques, PreviousRow, ProcessedBits)
CurrentRowUniques = GetUniquesAt(Uniques, CurrentRow, ProcessedBits)
CurrentOffset = GetCurrentOffsetForRow(Uniques, CurrentRow, ProcessedBits)
If LoopTwo Then
'Get a list of all Rows used +1
Dim listsOfUniquesUsed As New List(Of Byte())
Dim LastRow As Long = 0
Dim IsPossible As Boolean = True
For row As Long = 0 To ProcessedBits.Length - 1
'Get a list of every value used in every row
'Don't process the tree until at least 2 rows are used.. then it will use the 3rd row if possible
If ProcessedBits.Length > 1 AndAlso ProcessedBits(1)(0) = 0 Then
Exit For
End If
If ProcessedBits(row)(0) = 1 Then
listsOfUniquesUsed.Add(GetUniquesAt(Uniques, row, ProcessedBits))
'Get the first value of a un-used Row just to checking if it's a possible answer too.
ElseIf ProcessedBits(row)(0) = 0 Then
listsOfUniquesUsed.Add(New Byte() {Uniques(row)(0)})
LastRow = row
Exit For
End If
'Hit last row and last row is already used so this whole thing is not possible
If row = ProcessedBits.Length - 1 AndAlso ProcessedBits(row)(0) = 1 Then
IsPossible = False
End If
Next
If IsPossible Then
'This checks to make sure all the commons that are partially in all lists.
Dim list() As Byte = listsOfUniquesUsed.SelectMany(Function(x) x).Distinct().Where(Function(item) listsOfUniquesUsed.All(Function(l) l.Contains(item))).ToArray()
'If a possible match is found
'make sure there Is a row below the current row, If no point in doing it.
'If list.Count > 0 AndAlso PreviousRow + 1 < Uniques.Length AndAlso FailedPaths.Where(Function(c) c.StartsWith(FinalString)).Count = 0 Then
If list.Count > 0 AndAlso PreviousRow + 1 < Uniques.Length AndAlso Not FailedPaths.Contains(FinalString) Then
'CurrentOffset Spoofed
Dim PreviousRowSpoofed As UInteger = CurrentRow
Dim CurrentRowSpoofed As UInteger = LastRow
'Possible 2 answers are possible!
ProcessTreeNodes(FinalString, ProcessedBits, CurrentProcessedByte, PreviousRowSpoofed, CurrentRowSpoofed)
End If
End If
End If
'Quick fix
If MainRowUniquesUsed Is Nothing Then
CurrentRow = PreviousRow
CurrentOffset = GetCurrentOffsetForRow(Uniques, CurrentRow, ProcessedBits)
FinalString = FinalString & " " & Uniques(CurrentRow)(CurrentOffset)
'Mark as processed for future calculations
ProcessedBits(CurrentRow)(CurrentOffset) = 1
LoopTwo = True
Exit While
End If
'Next Row is blank, then its just a fresh entry
If CurrentRowUniques Is Nothing Then
FinalString = FinalString & " " & Uniques(CurrentRow)(CurrentOffset)
'Mark as processed for future calculations
ProcessedBits(CurrentRow)(CurrentOffset) = 1
LoopTwo = True
Exit While
'Scan this row if its a possible insert here or possible go to next
ElseIf CurrentRowUniques IsNot Nothing Then
Dim ValueNotUsed() As Byte = Uniques(CurrentRow) _
.Select(Function(item, index) New With {.Item = item, .Index = index}) _
.Where(Function(x) ProcessedBits(CurrentRow)(x.Index) = 0) _
.Select(Function(x) x.Item).ToArray()
'If no values are possible, then go check next row.
If ValueNotUsed.Length = 0 Then
'If the Next Row is the Row we were in, just before this one Jump 2 rows
If CurrentRow + 1 = PreviousRow Then
CurrentRow = CurrentRow + 2
Else
CurrentRow = CurrentRow + 1
End If
'This quick fix isn't checked could be wrong
'it just starts from the top if it hit a row past the last row.
If CurrentRow >= Uniques.Length Then
CurrentRow = 0
End If
Continue While
'This is a possible answer area (where it would spawn multiple nodes to keep recursively finishing it.)
ElseIf ValueNotUsed.Length > 0 Then
If Not MainRowUniquesUsed.Contains(ValueNotUsed(0)) Then
'The next pattern isn't found in this Row, so we hope next row.
'Keep hopping rows until we hit the row which is the farthest one
'Then we could exit out.
'If the Next Row is the Row we were in, just before this one Jump 2 rows
If CurrentRow + 1 = PreviousRow Then
CurrentRow = CurrentRow + 2
Else
CurrentRow = CurrentRow + 1
End If
If CurrentRow + 1 > PreviousRow Then
'Hit the row we currently on and still no match so its a bad loop
ExitedTooSoon = True
Exit While
ElseIf CurrentRow >= Uniques.Length Then
'Probably does not work?
CurrentRow = 0
End If
Continue While
End If
'Scan Previous Rows for the same answer as in this Row.
FinalString = FinalString & " " & Uniques(CurrentRow)(CurrentOffset)
'Mark as processed for future calculations
ProcessedBits(CurrentRow)(CurrentOffset) = 1
LoopTwo = True
Exit While
End If
End If
End While
End If
If ExitedTooSoon Then
Exit While
End If
CurrentOffset += 1
CurrentProcessedByte += 1
End While
If ExitedTooSoon Then
FailedPaths.Add(FinalString)
Exit Sub
End If
Dim output As String
output = output & "TreeNode Decoded Answer: " & FinalString & vbCrLf
output = output & "Stopped at row: " & CurrentRow & vbCrLf
txtOutput.Text = txtOutput.Text & output
End Sub
1 9 4 2 4 2 4 2 1 2 4 3 2 4 1 2 3 4 0 3 1 3 0 4 2 0 4 1 0 0 2 0 4 6 3 1 3
公共位掩码（）作为字节
公共失败路径作为新列表（字符串）
公共Uniques（）（）作为字节
公共函数GetUniquesAt（uniques（）（）作为字节，CurrentRow作为UInteger，ProcessedBits（）（）作为字节）作为字节（）
Dim eachUniqueIndex为整数=0
Dim UniquesUsed（）作为字节
'ReDim UniquesUsed（0）
对于每个队列索引=0到UBound（uniques（CurrentRow），1）
如果处理位（CurrentRow）（每个chuniqueIndex）=1，则
'向此行添加新编号
如果UniquesUsed不算什么
使用的ReDim保留唯一性（0）
其他的
ReDim保存唯一使用的（唯一使用的长度）
如果结束
Dim LastValueInRow作为整数=唯一使用的长度
使用的唯一性（LastValueInRow-1）=唯一性（CurrentRow）（每种唯一性索引）
如果结束
下一个
返回唯一使用的
端函数
公共函数GetCurrentOffsetForRow（uniques（）（）作为字节，CurrentRow作为UInteger，ProcessedBits（）（）作为字节）作为UInteger
Dim eachUniqueIndex为整数=0
对于每个队列索引=0到UBound（uniques（CurrentRow），1）
如果处理的位（CurrentRow）（每个chuniqueIndex）=0，则
返回每个队列索引
如果结束
下一个
返回每个队列索引
端函数
私有子按钮2\u单击（发送者作为对象，e作为事件参数）处理按钮2。单击
txtendoplantext.Text=替换（txtendoplantext.Text，“，”）
txtendoplantext.Text=txtendoplantext.Text.TrimStart（CChar（“”）
txtendoplantext.Text=txtendoplantext.Text.TrimEnd（CChar（“”）
Dim UniqueList（）的形式为Byte=Split（txtendoplantext.Text，“”。[选择]（函数（n）Byte.Parse（n））.ToArray（）
txtendobitmask.Text=替换（txtendobitmask.Text，“，”）
txtendobitmask.Text=txtendobitmask.Text.TrimStart（CChar（“”）
txtendobitmask.Text=txtendobitmask.Text.TrimEnd（CChar（“”）
bitmask=Split（txtendobitmask.Text，“”。[选择]（函数（n）Byte.Parse（n））.ToArray（）
'从以前的运行中清除Unique。
唯一=无
将上一行变暗为UInteger=0
'检查从第一行到当前行是否存在唯一性
尺寸CurrentRow为UInteger=0
Dim包含的VALUESINROW为布尔值=False
'如果当前行未初始化，则初始化它。
如果Uniques不算什么
ReDim Uniques（当前行）
Uniques（CurrentRow）=新字节（）{}
如果结束
将ProcessedBits（）变为字节
ReDim处理位（当前行）
ProcessedBits（CurrentRow）=新字节（）{}
'将uniques加载到uniques列表中
对于唯一列表中的每个值
ContainsValueInRow=False
'检查行是否包含当前值，如果它确实更改为下一行。
对于每个队列索引=0到UBound（Uniques（CurrentRow），1）
如果Uniques（CurrentRow）（eachUniqueIndex）=值，则
ContainsValueInRow=True
退出
如果结束
下一个
如果包含以下值，则
CurrentRow+=1
ReDim保留唯一性（当前行）
Uniques（CurrentRow）=新字节（）{}
ReDim保留已处理位（当前行）
ProcessedBits（CurrentRow）=新字节（）{}
如果结束
Dim LastValueInRow As Integer=Uniques（当前行）。长度
'将新编号添加到此行
ReDim保留唯一性（当前行）（LastValueInRow）
Uniques（CurrentRow）（LastValueInRow）=值
ReDim保留已处理位（当前行）（LastValueInRow）
已处理位（当前行）（LastValueInRow）=0
下一个
FailedPaths.Clear（）
CurrentRow=0
Dim CurrentProcessedByte的长度=0
长=0时的Dim CurrentOffset
Dim FinalString As String=“”
布尔值为False时立即退出Dim
ProcessTreeNodes（最后一个字符串、ProcessedBits、CurrentProcessedByte、PreviousRow、CurrentRow）
将输出设置为字符串
输出=输出和“最终解码答案：”&FinalString&vbCrLf
输出=输出和“在以下行停止：”&CurrentRow&vbCrLf
txtOutput.Text=txtOutput.Text&output
端接头
公共子进程树节点（_FinalString作为字符串，_ProcessedBits（）（）作为字节，CurrentProcessedByte作为字节，前一行A