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快速排序: !ALq?u
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package org.rut.util.algorithm.support; _kc}:
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import org.rut.util.algorithm.SortUtil; ,rjl|F*
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/** dV{mmHL
* @author treeroot H&
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* @since 2006-2-2 6HPuCP
* @version 1.0 LLFQ5py{
*/ * H~=dPC
public class QuickSort implements SortUtil.Sort{ [%P[ x]-
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/* (non-Javadoc) HRyhq;C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p({Lp}'
*/ wwet90_g
public void sort(int[] data) { gi>W&6
quickSort(data,0,data.length-1); 0e07pF/!
} (5A8# 7a
private void quickSort(int[] data,int i,int j){ F-F1^$]k
int pivotIndex=(i+j)/2;
}ikN
//swap g{
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SortUtil.swap(data,pivotIndex,j); ,:#h;4!VRF
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int k=partition(data,i-1,j,data[j]); r7#.DJnN.
SortUtil.swap(data,k,j); Nobu=
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if((k-i)>1) quickSort(data,i,k-1); *8+HQ[[#
if((j-k)>1) quickSort(data,k+1,j); "bB0$>0,
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} >4q6
/** .2U3_1dX
* @param data =7#"}%4Q
* @param i '(SivD
* @param j yeMe2Zx
* @return `\P1Ff@z0
*/ bPif"dhHe
private int partition(int[] data, int l, int r,int pivot) { ?D,j!Hy
do{ aI=Q_}8-
while(data[++l] while((r!=0)&&data[--r]>pivot); NcHU)
SortUtil.swap(data,l,r); ao0^;
} K-"`A.:S
while(l SortUtil.swap(data,l,r); ;at1|E*
return l; &EYoviFp
} Z4:^#98c.
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} >|`1aCg,
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改进后的快速排序: K'/if5>Bc
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package org.rut.util.algorithm.support; >$yA
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import org.rut.util.algorithm.SortUtil; q!+:zZu
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/** <o[3*59
* @author treeroot W'=}2Y$]u
* @since 2006-2-2 azNv(|eeJL
* @version 1.0 *wsZ aQ
*/ 4<vi@,s
public class ImprovedQuickSort implements SortUtil.Sort { I(WIT=Wi<
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private static int MAX_STACK_SIZE=4096; =}@1Z~
private static int THRESHOLD=10; %!AzFL
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/* (non-Javadoc) Vugb;5Vl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Vr d16s
*/ sP}u zS
public void sort(int[] data) { x%O6/rl
int[] stack=new int[MAX_STACK_SIZE]; s"J)Jc
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int top=-1; DajN1}]
int pivot; SjY|aW+wAL
int pivotIndex,l,r; QC!SgV
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stack[++top]=0; fYzP4
stack[++top]=data.length-1; X$@qs9?)^
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while(top>0){ )FmIL(vu
int j=stack[top--]; @H3x51PT(m
int i=stack[top--]; 2`%a[t@M.
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pivotIndex=(i+j)/2; eX lJ=S}
pivot=data[pivotIndex]; *W^a<Zm8>
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SortUtil.swap(data,pivotIndex,j); ?Bl/bY$*h
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//partition x]`@%8Sm
l=i-1; 9:GP~oI j
r=j; wr=KAsH<
do{ hF5T9^8
while(data[++l] while((r!=0)&&(data[--r]>pivot)); fLd2{jI,
SortUtil.swap(data,l,r); &cJ?mSI
} 7&OJ8B/
while(l SortUtil.swap(data,l,r); {IvA 5^
SortUtil.swap(data,l,j); |Ldvfd
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if((l-i)>THRESHOLD){ l(-"rE
stack[++top]=i; `@WJ_-$#
stack[++top]=l-1; Y"r728T`K
} hQ!59
if((j-l)>THRESHOLD){ L,
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stack[++top]=l+1; {o 5^nd
stack[++top]=j; ](8F]J ,
} u<N`;s
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} $~/cxLcT
//new InsertSort().sort(data); JZ*.;}"
insertSort(data); #qR 6TM&;
} ~tV7yY|zr
/** ~K;hXf
* @param data O"df5x9@
*/ 'Ha> >2M
private void insertSort(int[] data) { DpQWh+WRy
int temp; `4X.UPJ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); vD:J!|hs(
} J7-
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} Y'bz>@1(
} HC1<zW[
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} `-{? !
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