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package org.rut.util.algorithm.support; X<#Q~"
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import org.rut.util.algorithm.SortUtil; Rkw)IdB
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/** }yK_2zak5i
* @author treeroot A^bg*t,
* @since 2006-2-2 ~Pv4X2MO
* @version 1.0 j'X]bd'
*/ \&Mipf7a
public class QuickSort implements SortUtil.Sort{ Do=*bZ;A
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/* (non-Javadoc) jF_K*:gQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) aVM@^n
*/ K /g\x0
public void sort(int[] data) { {%N*AxkvId
quickSort(data,0,data.length-1); |L%F`K>Z:
} R1{"
private void quickSort(int[] data,int i,int j){ sn}U4=u
int pivotIndex=(i+j)/2; vd9l1"S
//swap `~(KbH=]
SortUtil.swap(data,pivotIndex,j); H}dsd=yO
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int k=partition(data,i-1,j,data[j]); tceQn
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SortUtil.swap(data,k,j); 6f\0YU<C&
if((k-i)>1) quickSort(data,i,k-1); CJ
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if((j-k)>1) quickSort(data,k+1,j); :PY~Cws
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} Uj(,6K8W
/** R`:Y&)c_$
* @param data h<$V ry}
* @param i hGcOk[m 4
* @param j r*p<7
* @return n/=&?#m}d
*/ (SkI9[1\@3
private int partition(int[] data, int l, int r,int pivot) { * G.6\
do{ e7{3:y|]d3
while(data[++l] while((r!=0)&&data[--r]>pivot); *jCXH<?R
SortUtil.swap(data,l,r); (TVzYm
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} Hhx<k{B@7
while(l SortUtil.swap(data,l,r); .%M=dL>
return l; % )i?\(/
} RI')iz?
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} _$9<N5F.,o
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改进后的快速排序: N|h`}*:x=
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package org.rut.util.algorithm.support; ;Tvy)*{
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import org.rut.util.algorithm.SortUtil; p6A"_b^
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/** y4/>3tz;
* @author treeroot DHaSBk
* @since 2006-2-2 HZ>Xm6DnC5
* @version 1.0 +s
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*/ I8Y[d$z
public class ImprovedQuickSort implements SortUtil.Sort { 2(\~z@g
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private static int MAX_STACK_SIZE=4096; `-hFk88
private static int THRESHOLD=10; ;E,%\<
/* (non-Javadoc) H/|Mq#K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ${8 1~
*/ k =ru)
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public void sort(int[] data) { z%}^9
int[] stack=new int[MAX_STACK_SIZE];
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int top=-1; :y"Zc1_E
int pivot; {[m %1O1
int pivotIndex,l,r; 94 H\,}i8
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stack[++top]=0; _W@q %L>
stack[++top]=data.length-1; 0mF3Vs`-Q
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while(top>0){ %i]q} M
int j=stack[top--]; 9mEC|(m*WK
int i=stack[top--]; |p4F^!9
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pivotIndex=(i+j)/2; KA0Ui,q3
pivot=data[pivotIndex]; w[^s)1
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SortUtil.swap(data,pivotIndex,j); '{5|[
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//partition RnE=T/VZJ
l=i-1; xx)egy_
r=j; +`r;3kH ..
do{ g7EJyA
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Egi<m
SortUtil.swap(data,l,r); V&-pgxf;
} ac6L3=u\
while(l SortUtil.swap(data,l,r); %?' jyK
SortUtil.swap(data,l,j); l5b?
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if((l-i)>THRESHOLD){ 0V
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stack[++top]=i; )V*Z|,#no
stack[++top]=l-1; ULIbVy7Y
} O3bo3Cm$
if((j-l)>THRESHOLD){ c_s=>z
stack[++top]=l+1; X|{TwmHd
stack[++top]=j; uCB7(<
} GPy+\P`
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} ex
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//new InsertSort().sort(data); VC:.ya|Z
insertSort(data); ?\L@Pr|=Dr
} ~c%H3e>Jcq
/** -fI-d1@
* @param data +?5nkhH
*/ 6+b!|`?l+
private void insertSort(int[] data) { y
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int temp; U;<07
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 3WZ]9v{k
} EJ;:O1,6H
} 5`53lK.C
} qgbp-A!2zF
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} Wf^6:
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