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快速排序: \&47u1B
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package org.rut.util.algorithm.support; 2#/23(Wc
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import org.rut.util.algorithm.SortUtil; q1v7(`O
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/** 'KDt%?24
* @author treeroot ubRhJ~XB
* @since 2006-2-2 &j,#5f(
* @version 1.0 &2S-scP
*/ Kg`P@
public class QuickSort implements SortUtil.Sort{ ?d+ri
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/* (non-Javadoc) T}/|nOu
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;A4j_8\[
*/ n.t5:SW
public void sort(int[] data) { m#[9F']Z`
quickSort(data,0,data.length-1); '#SZ|Rr6tX
} 6TTu[*0NT
private void quickSort(int[] data,int i,int j){ $0vWC#.A]
int pivotIndex=(i+j)/2; ug.|ag'R
//swap =CO) Q2
SortUtil.swap(data,pivotIndex,j); $B7c\MR
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int k=partition(data,i-1,j,data[j]); !&:Cp_
SortUtil.swap(data,k,j); UBJYs{zz
if((k-i)>1) quickSort(data,i,k-1); EV-sEl8ki
if((j-k)>1) quickSort(data,k+1,j); &*Xrh7K2e
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} ||fw!8E
/** u})*6 l.
* @param data (P;TM1k
* @param i ^$}O?y7O
* @param j 5*+DN
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* @return
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*/ _iCrQJ0"T
private int partition(int[] data, int l, int r,int pivot) { yf!7
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do{ ,|A6l?iV
while(data[++l] while((r!=0)&&data[--r]>pivot); a6cU<(WDeh
SortUtil.swap(data,l,r); S=lCzL;j"
} cvo+{u$s
while(l SortUtil.swap(data,l,r); tQRbNY#}Z
return l;
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} S>r}3,]S
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改进后的快速排序: F_g(}wE#
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package org.rut.util.algorithm.support; 0^\H$An*k
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import org.rut.util.algorithm.SortUtil; AZE%fOG<i
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/** '3U,UD5EG
* @author treeroot 38m9t'
* @since 2006-2-2 y9]7LETv\M
* @version 1.0 -^yc<%U
*/ AzF*4x
public class ImprovedQuickSort implements SortUtil.Sort { Pv,PS.,-
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private static int MAX_STACK_SIZE=4096; DJ7ak>"R
private static int THRESHOLD=10; @%2crJnkS
/* (non-Javadoc) t(V2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _<jU! R
*/ :h(3Ep
public void sort(int[] data) { F.x7/;
int[] stack=new int[MAX_STACK_SIZE]; h lc!}{$%8
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int top=-1; Sin)]zG~0
int pivot; ==?%]ZE8
int pivotIndex,l,r; o6|-
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stack[++top]=0; #y7 MB6-
stack[++top]=data.length-1; fKFD>u0%
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while(top>0){ YU0pWM
int j=stack[top--]; .@+M6K*
int i=stack[top--]; )'g4Ty
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pivotIndex=(i+j)/2; ]j,o!|rx7
pivot=data[pivotIndex]; 1I'}Uh*
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SortUtil.swap(data,pivotIndex,j); 9Z=hg[`]<
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//partition n} !')r
l=i-1; y]obO|AH
r=j; c[X6!_
do{ :N^B54o%6
while(data[++l] while((r!=0)&&(data[--r]>pivot)); G@~e:v)
SortUtil.swap(data,l,r); jt323hHth
} Q2]7|C
while(l SortUtil.swap(data,l,r); i@WO>+iB
SortUtil.swap(data,l,j); Ekrpg^3qp"
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if((l-i)>THRESHOLD){ cdH`#X
stack[++top]=i; xDekC~Zq
stack[++top]=l-1; X=6L-^o)
} =? q&/
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if((j-l)>THRESHOLD){ Gv 8Z
stack[++top]=l+1; j+/EG^*/
stack[++top]=j; s/E9$*0
} U:MZN[Cc[
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} F3Da-6T@
//new InsertSort().sort(data); o!y<:CGL
insertSort(data); "].TKF#yg
} uF|[MWcy0#
/** 93w$ck},?G
* @param data 2%fkXH<
*/ aG@GJ@w
private void insertSort(int[] data) { sZqi)lo-s
int temp; GLV`IkU %
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); #vBSg
} JL:B4f%}B
} FEa%wS{
} Pff-eT+~m
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} GBd
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