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快速排序: (;N#Gqb6l
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package org.rut.util.algorithm.support; =6qSo
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import org.rut.util.algorithm.SortUtil; >Gvd?r
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/** h6:|RGF
* @author treeroot BGstf4v>A<
* @since 2006-2-2 /1+jQS
* @version 1.0 X9&>.?r
*/ Z3X9-_g
public class QuickSort implements SortUtil.Sort{ [a#*%H{OC
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/* (non-Javadoc) Kj-zEl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Lr "V
*/ ciCQe]fS
public void sort(int[] data) { FaaxfcIfkw
quickSort(data,0,data.length-1); 5E${
} %^u
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private void quickSort(int[] data,int i,int j){ ^>y|{;`
int pivotIndex=(i+j)/2; \rH0=~F-P
//swap 8&7zV:=
SortUtil.swap(data,pivotIndex,j); AbX#wpp!
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int k=partition(data,i-1,j,data[j]); +4[Je$qYa
SortUtil.swap(data,k,j); 0.U-
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if((k-i)>1) quickSort(data,i,k-1); (J
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if((j-k)>1) quickSort(data,k+1,j); qMd4awB
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} z;&J9r$`
/** b>& 3XDz
* @param data /~/nhKm
* @param i l%
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* @param j d @b ]/
* @return e,*@+E\4
*/ aL8Z|*
private int partition(int[] data, int l, int r,int pivot) { K[q-[q#yc
do{ PD^Cj?wm
while(data[++l] while((r!=0)&&data[--r]>pivot); ztC,[
SortUtil.swap(data,l,r); 1E$^ul-v
} V'l9fj*E
while(l SortUtil.swap(data,l,r); /!hxW}>^
return l; gjB(Pwx
} @M(+YCi:e@
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} ^W0eRT
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改进后的快速排序: "OrF81
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package org.rut.util.algorithm.support; h0-CTPQ7A
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import org.rut.util.algorithm.SortUtil; c:-n0m'i
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/** jOxnf%jl
* @author treeroot I\=&v^]
* @since 2006-2-2 9*(uJA
* @version 1.0 K6nNrd}p:
*/ \IOF 9)F
public class ImprovedQuickSort implements SortUtil.Sort {
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private static int MAX_STACK_SIZE=4096; $KsB'BZy
private static int THRESHOLD=10; 8y]{I^z}
/* (non-Javadoc) Lv-M.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~W_T3@
*/ M"ZeK4qh
public void sort(int[] data) { F^!_!V B
int[] stack=new int[MAX_STACK_SIZE]; ~AcjB(
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int top=-1; D\z`+TyJ
int pivot; p<Vj<6.=?
int pivotIndex,l,r; y6>fK@K~
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stack[++top]=0; `OWwqLoeA
stack[++top]=data.length-1; Htce<H-P
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while(top>0){ is{H >#+"
int j=stack[top--]; YF)c.Q0
int i=stack[top--]; oox;8d4}y
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pivotIndex=(i+j)/2;
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pivot=data[pivotIndex]; ^:ehG9
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SortUtil.swap(data,pivotIndex,j); .:Zb~
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//partition Jwbb>mB!
l=i-1; 1sXVuto
r=j; >NtJ)N*
do{ G=m18Bv{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); mzn#4;m$
SortUtil.swap(data,l,r); rG'W#!^*
} #mRT>]di`D
while(l SortUtil.swap(data,l,r); *,e`.
SortUtil.swap(data,l,j); e Y(JU5{
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if((l-i)>THRESHOLD){ K^c%$n:}+
stack[++top]=i; f|{&Y2h(R
stack[++top]=l-1; awOH50R
} Mu$"fYKf"
if((j-l)>THRESHOLD){ <a&$D
stack[++top]=l+1; [9~6, ;6
stack[++top]=j; E7@m& R
} @5cY5e*i{
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} dz)(~@tgz
//new InsertSort().sort(data); #$,b )Uy
insertSort(data); =m?x5G^
} 9*? i89T
/** ?Nl@K/
* @param data 4l_~-Peh
*/ D3C3_
@*
private void insertSort(int[] data) { R(#ZaFuo[
int temp; gLWbd~
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +\25ynM
} {0\9HI@
} jR^_1bu
} GNM+sdy+
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} yzyK$WN\[3
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