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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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Task/Sorting-algorithms-Quicksort/QB64/sorting-algorithms-quicksort.qb64 Normal file
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' Written by Sanmayce, 2021-Oct-29
' The indexes are signed, but the elements are unsigned.
_Define A-Z As _INTEGER64
Sub Quicksort_QB64 (QWORDS~&&())
Left = LBound(QWORDS~&&)
Right = UBound(QWORDS~&&)
LeftMargin = Left
ReDim Stack&&(Left To Right)
StackPtr = 0
StackPtr = StackPtr + 1
Stack&&(StackPtr + LeftMargin) = Left
StackPtr = StackPtr + 1
Stack&&(StackPtr + LeftMargin) = Right
Do 'Until StackPtr = 0
Right = Stack&&(StackPtr + LeftMargin)
StackPtr = StackPtr - 1
Left = Stack&&(StackPtr + LeftMargin)
StackPtr = StackPtr - 1
Do 'Until Left >= Right
Pivot~&& = QWORDS~&&((Left + Right) \ 2)
Indx = Left
Jndx = Right
Do
Do While (QWORDS~&&(Indx) < Pivot~&&)
Indx = Indx + 1
Loop
Do While (QWORDS~&&(Jndx) > Pivot~&&)
Jndx = Jndx - 1
Loop
If Indx <= Jndx Then
If Indx < Jndx Then Swap QWORDS~&&(Indx), QWORDS~&&(Jndx)
Indx = Indx + 1
Jndx = Jndx - 1
End If
Loop While Indx <= Jndx
If Indx < Right Then
StackPtr = StackPtr + 1
Stack&&(StackPtr + LeftMargin) = Indx
StackPtr = StackPtr + 1
Stack&&(StackPtr + LeftMargin) = Right
End If
Right = Jndx
Loop Until Left >= Right
Loop Until StackPtr = 0
End Sub