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yjh_27 发表于 2013-1-23 22:47
http://club.excelhome.net/thread-543994-1-1.html
有问题直说无妨。无理论基础,有些只能使用。
你自己体会吧:
代码: | Sub test()
Dim i&, aRnd!(), arr, t#, nCount&
ReDim aRnd(1 To 10 ^ 3)
Randomize
For i = 1 To UBound(aRnd)
aRnd(i) = Rnd
Next
arr = aRnd
t = Timer
Call Fake(arr)
Debug.Print "Fake used: " & Round(Timer - t, 2) & " seconds." & vbCrLf
For i = 1 To UBound(arr) - 1
If arr(i) > arr(i + 1) Then Debug.Print "Fake is WRONG!": Exit For
Next
arr = aRnd
t = Timer
Call Bubble(arr)
Debug.Print "Bubble used: " & Round(Timer - t, 2) & " seconds." & vbCrLf
For i = 1 To UBound(arr) - 1
If arr(i) > arr(i + 1) Then Debug.Print "Bubble is WRONG!": Exit For
Next
arr = aRnd
t = Timer
Call QuickSort(arr, LBound(arr), UBound(arr), nCount)
Debug.Print "QuickSort swap times: " & nCount
Debug.Print "QuickSort used: " & Round(Timer - t, 2) & " seconds." & vbCrLf
For i = 1 To UBound(arr) - 1
If arr(i) > arr(i + 1) Then Debug.Print "QuickSort is WRONG!": Exit For
Next
End Sub
Sub Fake(arr)
Dim m&, i&, swap, nCount&
m = LBound(arr)
For i = LBound(arr) To UBound(arr) - 1
If arr(i) <= arr(i + 1) Then
If i > m Then m = i Else i = m
Else
swap = arr(i): arr(i) = arr(i + 1): arr(i + 1) = swap
nCount = nCount + 1
If i > LBound(arr) Then i = i - 2
End If
Next
Debug.Print "Fake swap times: " & nCount
End Sub
Sub Bubble(arr)
Dim i&, j&, swap, nCount&
For i = LBound(arr) To UBound(arr) - 1
For j = i + 1 To UBound(arr)
If arr(i) > arr(j) Then
swap = arr(i): arr(i) = arr(j): arr(j) = swap
nCount = nCount + 1
End If
Next
Next
Debug.Print "Bubble swap times:" & nCount
End Sub
Sub QuickSort(arr, nLeft&, nRight&, nCount&)
Dim i&, j&, swap, key
If nLeft >= nRight Then Exit Sub
key = arr(nLeft)
i = nLeft + 1: j = nRight
Do
Do While i <= nRight
If arr(i) > key Then Exit Do
i = i + 1
Loop
Do While j > nLeft
If arr(j) < key Then Exit Do
j = j - 1
Loop
If i >= j Then Exit Do
swap = arr(i): arr(i) = arr(j): arr(j) = swap: nCount = nCount + 1
Loop
swap = arr(nLeft): arr(nLeft) = arr(j): arr(j) = swap: nCount = nCount + 1
Call QuickSort(arr, nLeft, j, nCount)
Call QuickSort(arr, j + 1, nRight, nCount)
End Sub
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