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快速排序: >}+R+''nR
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package org.rut.util.algorithm.support; ,)dlL tUm
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import org.rut.util.algorithm.SortUtil; %rhZH^2
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/** )HI\T];
* @author treeroot .Mb0++% W
* @since 2006-2-2 V'>P lb.A
* @version 1.0 smQl^
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*/ :
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public class QuickSort implements SortUtil.Sort{ ^>ir&$
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{
/* (non-Javadoc) Ua:@,};
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )=iv3nF?6N
*/ /W*Z.
public void sort(int[] data) { P%Vq#5
quickSort(data,0,data.length-1); G{4s~Pco[Q
} K, !
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private void quickSort(int[] data,int i,int j){ *k8?$(
int pivotIndex=(i+j)/2; [mjie1j/<
//swap JttDRNZAU
SortUtil.swap(data,pivotIndex,j); #O;JV}y
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int k=partition(data,i-1,j,data[j]); )kI**mI}
SortUtil.swap(data,k,j); MYjc6@=cR
if((k-i)>1) quickSort(data,i,k-1); 2YKa <?_
if((j-k)>1) quickSort(data,k+1,j); 2yg6hR
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} v
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/** ;9h;oB@
* @param data o.fqJfpj
* @param i yCN_vrH>
* @param j <C(o0u&/
* @return 4%ooJi|)
*/ lD3nz<p
private int partition(int[] data, int l, int r,int pivot) { 7g"u)L&32
do{ 77)WNL/
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while(data[++l] while((r!=0)&&data[--r]>pivot); ; iia?f1
SortUtil.swap(data,l,r); S$Zi{bU`G
} |SjRss:i+
while(l SortUtil.swap(data,l,r); c'eZ-\d{
return l; ]1<GZ`
} esnq/
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} p8!T)
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改进后的快速排序: v wEbGx
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package org.rut.util.algorithm.support; Y"MHs0O5>
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import org.rut.util.algorithm.SortUtil; >SK:b/i
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/** s;Gd`-S>d
* @author treeroot $mn0I69
* @since 2006-2-2 Tf86CH=)5
* @version 1.0 uX6yhaOp|
*/ IFp%Ta
public class ImprovedQuickSort implements SortUtil.Sort { h)HEexyRg
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private static int MAX_STACK_SIZE=4096; ?Afe}
private static int THRESHOLD=10; Wb-C0^dTn
/* (non-Javadoc) At iUTA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) x=oV!x
*/ KC6Cg?y^
public void sort(int[] data) { . 5(YL8d
int[] stack=new int[MAX_STACK_SIZE]; !!y]pMjJa@
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int top=-1; Ktq 4b%{
int pivot; >rCD5#DG
int pivotIndex,l,r; $4nAb^/
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stack[++top]=0; K~TwyB-h
stack[++top]=data.length-1; yQK{ +w
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while(top>0){ nkW})LyB\
int j=stack[top--]; >h\y1IrAaG
int i=stack[top--]; )+G"57p
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pivotIndex=(i+j)/2; !g@Ky$
pivot=data[pivotIndex]; DrK]U}3fh"
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SortUtil.swap(data,pivotIndex,j); *w+'I*QSt~
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//partition azP H~'E'
l=i-1; }"D;?$R!
r=j; ;4nY{)bD
do{ 'nCVjO7o
while(data[++l] while((r!=0)&&(data[--r]>pivot)); p='j/=
SortUtil.swap(data,l,r); GX>8B:]o|
} 3\7MeG`tl
while(l SortUtil.swap(data,l,r); /ZvP.VW&
SortUtil.swap(data,l,j); 6TP
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if((l-i)>THRESHOLD){ 8y
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stack[++top]=i; 2bt>t[0ad
stack[++top]=l-1; eZ'8JU]
} s<I)THC
if((j-l)>THRESHOLD){ Fs/CW\
stack[++top]=l+1; R"B{IWQi
stack[++top]=j; ;uBGB
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} tOIqX0dWd
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} Y~"tL(WfJl
//new InsertSort().sort(data); %3z[;&*3O
insertSort(data); "Z.6@
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} & NYaKu,}
/** btW#ebm
* @param data (TZK~+]@sb
*/ +Mo4g2W
private void insertSort(int[] data) { m?e/MQr
int temp; ;hT3N UCA
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 1Lb)S@Q`*R
} %1?t)Bg
} hek+zloB+
} \BHZRytQF
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} 9D3W _eIc
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