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快速排序: g+]o=@
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package org.rut.util.algorithm.support; Oh5aJ)"D
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import org.rut.util.algorithm.SortUtil; y`\rb<AZ*t
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/** "0aJE1)p:
* @author treeroot oH;9s-Be
* @since 2006-2-2 5pH6] $
* @version 1.0 vLIaTr gz
*/ 9>r@wK'Pn
public class QuickSort implements SortUtil.Sort{ a: 2ezxP
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/* (non-Javadoc) N(`XqeC*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Pos(`ys;
*/ h9kwyhd"
public void sort(int[] data) { @tlWyUju
quickSort(data,0,data.length-1); B^@X1EE
} Xbu P_U'
private void quickSort(int[] data,int i,int j){ ihd^P]
int pivotIndex=(i+j)/2; UsgrI>|l
//swap TjS&V
SortUtil.swap(data,pivotIndex,j); >';UF;\5]Q
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int k=partition(data,i-1,j,data[j]); |#ZMZmo{
SortUtil.swap(data,k,j); 'x<o{Hi"\B
if((k-i)>1) quickSort(data,i,k-1); >e!Y 63`
if((j-k)>1) quickSort(data,k+1,j); .'bhRQY
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} +-NH
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/** Hm'aD2k
* @param data yJW/yt.l
* @param i uj@d {AQ
* @param j K(#O@Wmjq
* @return 6 IRa$h>H
*/ @plh'f}
private int partition(int[] data, int l, int r,int pivot) { .l$U:d
do{ O>d
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while(data[++l] while((r!=0)&&data[--r]>pivot); sAS[wcOQ
SortUtil.swap(data,l,r); RT<HiVr`
} >%LY0(hY3
while(l SortUtil.swap(data,l,r); rgF4 W8
return l; )]C(NTfxg
} O!P7Wu
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改进后的快速排序: M9~6ry-_
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package org.rut.util.algorithm.support; (0["|h32,
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import org.rut.util.algorithm.SortUtil; :,V&P_
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/** |t~*!0>3
* @author treeroot fR]KXfZ
* @since 2006-2-2 ART0o7B
* @version 1.0 BS3{TGn
*/ y@r g_Paq
public class ImprovedQuickSort implements SortUtil.Sort { 6+4SMf3
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private static int MAX_STACK_SIZE=4096; XTRF IY
private static int THRESHOLD=10; ]CDUHz
/* (non-Javadoc) \027>~u
{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i,wZNX
*/ G5ShheZd
public void sort(int[] data) { }#S1!TU
int[] stack=new int[MAX_STACK_SIZE]; " s}Oeu[
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int top=-1; g(i8HU*{q
int pivot; $LVzhQlD
int pivotIndex,l,r; w?Pex]i{
uU=!e&3
stack[++top]=0; mbns%%GJU
stack[++top]=data.length-1; Tj+U:#!!~
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while(top>0){ CSY-{
int j=stack[top--]; R6TT1Ka3c
int i=stack[top--]; LtUvFe
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pivotIndex=(i+j)/2; x[xRqC
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pivot=data[pivotIndex]; aYM~Ub:x{
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SortUtil.swap(data,pivotIndex,j); 7CH.BY
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//partition Ns]$+|
l=i-1; v3{%U1>}v
r=j; z[@i=avPG
do{ \/b[V3<"
while(data[++l] while((r!=0)&&(data[--r]>pivot)); F"1tPWn
SortUtil.swap(data,l,r); N 1ydL
} BkP4.XRI
while(l SortUtil.swap(data,l,r); ;*0nPhBw0>
SortUtil.swap(data,l,j); 2@IL
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if((l-i)>THRESHOLD){ iNc!zA4
stack[++top]=i; Yr>0Qg],
stack[++top]=l-1; b1;h6AeL
} -/2B fIq
if((j-l)>THRESHOLD){ *qu5o5Q
stack[++top]=l+1; eL.WP`Lz
stack[++top]=j; 56Z
} L4Kg%icz l
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} _%Yi^^
//new InsertSort().sort(data); 7!wc'~;
insertSort(data); P- +]4\
} xGFbh4H=8p
/** ;G[0%z+*
* @param data ;WAa4r>
*/ ,.h@tN<C
private void insertSort(int[] data) { EwmNgmYq
int temp; >TiEYMW
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); /8!n7a7
} /;{L~f=et)
} ([^#.x)hz
} I@\D
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} 9dm<(I}
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