實現原理: 對比二進制位.
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
type
TIntArr = array of Integer;
{極快的正整數排序函數}
procedure IntSort(arr:TIntArr; low:Integer=0; high:Integer=-1; k:Cardinal=$80000000; c:Cardinal=1);
var
i,j,x: Integer;
begin
if high = -1 then high := Length(arr) -1;
i := low;
j := high;
while (i < j) do
begin
while (arr[j] and k <> 0) and (i < j) do Dec(j);
while (arr[i] and k = 0) and (i < j) do Inc(i);
if i < j then
begin
x := arr[j];
arr[j] := arr[i];
arr[i] := x;
end else begin
if arr[j] and k <> 0 then Dec(i) else Inc(j);
Break;
end;
end;
if k > c then
begin
if low < i then IntSort(arr, low, i, k div 2);
if j < high then IntSort(arr, j, high, k div 2);
end;
end;
{測試}
procedure TForm1.Button1Click(Sender: TObject);
var
MyArr: TIntArr;
i: Integer;
t: Int64;
begin
SetLength(MyArr, MAXWord);
for i := Low(MyArr) to High(MyArr) do MyArr[i] := Random(MaxInt);
t := GetTickCount;
IntSort(MyArr); //調用排序函數
Text := IntToStr(GetTickCount - t);
Memo1.Clear;
for i := 0 to Length(MyArr)-1 do
begin
if i mod 1000 = 0 then
Memo1.Lines.Add(IntToStr(MyArr[i]));
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Memo1.Clear;
Memo1.Align := alLeft;
Memo1.ScrollBars := ssVertical;
end;
end.
