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快速排序: _O%p{t'q<
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package org.rut.util.algorithm.support; 1`{ib
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import org.rut.util.algorithm.SortUtil; w)n]}k
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/** #+0R!Y
* @author treeroot Fr3t[:D
* @since 2006-2-2 ud D[hPJd
* @version 1.0 ]s@8I2_
*/ ,IE0+!I
public class QuickSort implements SortUtil.Sort{ %LHV 0u
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/* (non-Javadoc) 5FI>T=QF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {2^@jD
*/ {2r7:nvR
public void sort(int[] data) { VYo;[ue([
quickSort(data,0,data.length-1); D:tZiS=0
} :j<JZs>`R
private void quickSort(int[] data,int i,int j){ @98SC}}u
int pivotIndex=(i+j)/2; NfF:[qwh
//swap l$_rA~Mo
SortUtil.swap(data,pivotIndex,j); 0K0=Ob^(e
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int k=partition(data,i-1,j,data[j]); lG>e6[Wc
SortUtil.swap(data,k,j); ]_8I_VcQ
if((k-i)>1) quickSort(data,i,k-1); x)ZH;)
if((j-k)>1) quickSort(data,k+1,j); JSK5x(GlH
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} Zb;$ZUWQX
/** *%'7~58ObS
* @param data $i~`vu*
* @param i qXhf?x
* @param j i!x5T%x_
* @return ':)j@O3-
*/ B-'BJ|*4I
private int partition(int[] data, int l, int r,int pivot) { E=lfg8yb:
do{ W r7e_
while(data[++l] while((r!=0)&&data[--r]>pivot); luk2fi<$
SortUtil.swap(data,l,r); yc=#Jn?S
} <L/vNP
while(l SortUtil.swap(data,l,r); +{ !t~BW
return l; 4Xk;Qd
} %&+R":Bw
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} 1'm`SRX#e
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改进后的快速排序: ]{+M>i[
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package org.rut.util.algorithm.support; 3l(;Pt-yI
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import org.rut.util.algorithm.SortUtil; 5>[sCl-
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/** ur,"K'w
* @author treeroot <&EO=A
* @since 2006-2-2 UJ)M:~O
* @version 1.0 pjs9b%.
*/ (i0"hi
public class ImprovedQuickSort implements SortUtil.Sort { u+'@>%7
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private static int MAX_STACK_SIZE=4096; JKi@Kw
private static int THRESHOLD=10; 9iddanQA
/* (non-Javadoc) 4\SBf\ c
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) EJ;0ypbG
*/ '7LJuMp$#
public void sort(int[] data) { 3et2\wOX1x
int[] stack=new int[MAX_STACK_SIZE]; ~eOj:H
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int top=-1; \g:qQ*.
int pivot; 5OW8G][
int pivotIndex,l,r; <Dj$0g
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stack[++top]=0; ji)4WG/1
stack[++top]=data.length-1; ;n7|.O]*
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while(top>0){ .6 ?>t!&W
int j=stack[top--]; f'`nx;@X
int i=stack[top--]; E<#4G9O<
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pivotIndex=(i+j)/2; u"8 ;fS
pivot=data[pivotIndex]; *[1u[H9Cv
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SortUtil.swap(data,pivotIndex,j); P2Qyz}!wo
!k= 0X\5L
//partition fov=Yd!
l=i-1; n:^"[Le
r=j; +`s&i%{1>
do{ &A9A#It
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 2hwXWTSu
SortUtil.swap(data,l,r); L^ #< HQ
} Xlqz8cI
while(l SortUtil.swap(data,l,r); eFj6p<
SortUtil.swap(data,l,j); K)Xs L
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if((l-i)>THRESHOLD){ Y zBA{FE
stack[++top]=i; +/!=Ub[:U
stack[++top]=l-1; Il^\3T+
} >SxZ9T|%
if((j-l)>THRESHOLD){ ~
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stack[++top]=l+1; oF@x]bmU
stack[++top]=j; R<lNk<
} D _bkUR1
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} Mi/ &$"=
//new InsertSort().sort(data); csdOIF
insertSort(data); QLB1:O>
} l\=-+'Y
/** ~[uV
* @param data i#]aV]IT
*/ 7Js>!KR
private void insertSort(int[] data) { V@f6Lj
int temp; ra9cD"/J &
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); :<N6i/
} 0Y6q$h>4
} d@D;'2}Yc
} O+E1M=R6h
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} R*Xu(89
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