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快速排序: T1$fu(f
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package org.rut.util.algorithm.support; oXC|q-(C
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import org.rut.util.algorithm.SortUtil; #[ei/p
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/** eUBf-xA
* @author treeroot %bu$t,
* @since 2006-2-2 C%2BDj
* @version 1.0 _?]0b7X
*/ ~lBb%M
public class QuickSort implements SortUtil.Sort{ 6Zr_W#SE
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/* (non-Javadoc) l ga%U~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0 ge"ISK
*/ ` ,lm:x+(0
public void sort(int[] data) { YmrrZ&]q
quickSort(data,0,data.length-1); d=`a-R0
} 968<yO]
private void quickSort(int[] data,int i,int j){ {6*$ yLWK
int pivotIndex=(i+j)/2; %G'{G
//swap csh@C
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SortUtil.swap(data,pivotIndex,j); lN(|EI
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int k=partition(data,i-1,j,data[j]); hgYi ,e
SortUtil.swap(data,k,j); 0V RV.Ml
if((k-i)>1) quickSort(data,i,k-1); a&^HvXO(>(
if((j-k)>1) quickSort(data,k+1,j); ro& /
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} EZ,Tc;f=
/** 'CQ~ZV5
* @param data yL2sce[
* @param i {GH0>
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* @param j 1K*`i(
* @return Zz,j,w0 Z
*/ d}RU-uiW
private int partition(int[] data, int l, int r,int pivot) { O]-)?y/
do{ #EG
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while(data[++l] while((r!=0)&&data[--r]>pivot); dd+hX$,
SortUtil.swap(data,l,r); H{)DI(,Y^P
} YkN0,6
while(l SortUtil.swap(data,l,r); ^Z
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return l; &i(\g7%U
} }WowgY
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} {PGiNY%q
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改进后的快速排序: Y)O88C
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package org.rut.util.algorithm.support; YW14X
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import org.rut.util.algorithm.SortUtil; ut*sx9l
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/** ]| xfKDu
* @author treeroot
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* @since 2006-2-2 N*1{yl76x
* @version 1.0 &Z3u(Eb
*/ \ u*R6z
public class ImprovedQuickSort implements SortUtil.Sort { [ML|,kq!
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private static int MAX_STACK_SIZE=4096; .OM^@V~T
private static int THRESHOLD=10; A"3"f8P8a
/* (non-Javadoc) 3(oB[9]s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J16t&Ha`
*/ 5cF7w
public void sort(int[] data) { QmKEl|/{u
int[] stack=new int[MAX_STACK_SIZE]; nk*T
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int top=-1; _:1s7EC
int pivot; h@2YQgw`
int pivotIndex,l,r; g`Kh&|GU
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stack[++top]=0; [mcER4]}
stack[++top]=data.length-1; 0Yk$f1g
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while(top>0){ ^KF%Z2:$
int j=stack[top--]; @e#{Sm
int i=stack[top--]; I&J>
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pivotIndex=(i+j)/2; >2s31
{
pivot=data[pivotIndex]; j5:/Gl8
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SortUtil.swap(data,pivotIndex,j); >ufL RGL>
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//partition Z[G[.\0
l=i-1; W^,(we
r=j; 9dO. ,U*`
do{ X:>,3[hx|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); MqAN~<l [
SortUtil.swap(data,l,r); 01<Ti"
} a 7>^^?|
while(l SortUtil.swap(data,l,r); Wx` $hvdq
SortUtil.swap(data,l,j); 8b[<:{[YB
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if((l-i)>THRESHOLD){ sTu]C +A
stack[++top]=i; -NPX;e$<
stack[++top]=l-1; Vv&GyqoO]
}
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if((j-l)>THRESHOLD){ 0K(&EpVE
stack[++top]=l+1; w }=LC#le
stack[++top]=j; pf`vH`r
} XS(Q)\"
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} I]-"Tw
//new InsertSort().sort(data); l+#uQo6cqQ
insertSort(data); ?~3Pydrb#
} GUps\:ss
/** 7o7*g 7
* @param data | /X+2K}3
*/ E h+m|A
private void insertSort(int[] data) { [{q])P;
int temp; zi_0*znw
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); P
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} Ou] !@s
} ?&JKq^9\I
} `sLD>@m
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} \'6%Ld5km
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