[.NET] VB2008 8 Queen Problem的寫法
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Public Class Form1
Dim chess_board(8, 8) As Boolean
Function safe(ByVal chess_board(,) As Boolean, ByVal x As Integer, ByVal y As Integer) As Boolean
Dim is_safe As Boolean
Dim i, x2, y2, x3, y3, dp, dq As Integer
is_safe = True
For i = 1 To 8
If chess_board(x, i) Then
is_safe = False
ElseIf chess_board(i, y) Then
is_safe = False
End If
Next
For dp = -7 To 7
x2 = x + dp
y2 = y + dp
If x2 >= 1 And x2 <= 8 Then
If y2 >= 1 And y2 <= 8 Then
If chess_board(x2, y2) Then
is_safe = False
End If
End If
End If
Next
For dq = -7 To 7
x3 = x + dq
y3 = y - dq
If x3 >= 1 And x3 <= 8 Then
If y3 >= 1 And y3 <= 8 Then
If chess_board(x3, y3) Then
is_safe = False
End If
End If
End If
Next
Return is_safe
End Function
Sub draw_chess_board(ByVal chess_board)
Dim g = Me.CreateGraphics()
Dim i, x, y As Integer
For i = 1 To 9
g.DrawLine(Pens.Black, i * 15, 15, i * 15, 135)
g.DrawLine(Pens.Black, 15, i * 15, 135, i * 15)
Next
For x = 1 To 8
For y = 1 To 8
If chess_board(x, y) Then
g.DrawEllipse(Pens.Red, x * 15 + 4, y * 15 + 4, 7, 7)
End If
Next
Next
End Sub
Sub PlaceAQueen(ByVal chess_board(,) As Boolean, ByVal x As Integer)
For x = 1 To 8
For y = 1 To 8
If safe(chess_board, x, y) = True Then
chess_board(x, y) = True
Else
chess_board(x, y) = False
End If
If chess_board(8, y) Then
draw_chess_board(chess_board)
MsgBox("我找到一組解了，厲害吧！：）")
Else
PlaceAQueen(chess_board, x + 1)
End If
Next
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
PlaceAQueen(chess_board, 1)
End Sub
End Class
我不知道錯在哪，
可是執行的時候，
在Function第一行會出現"An unhandled exception of type
'System.StackOverflowException' occurred in 程式設計091222.exe"，
請幫我找一下bug吧！（感激
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◆ From: 120.127.32.231
※ 編輯: ruby791104 來自: 120.127.32.231 (12/20 10:43)
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