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快速排序: nx=#QLi
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package org.rut.util.algorithm.support; GMU<$x8o
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import org.rut.util.algorithm.SortUtil; .Z&OKWL
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/** ,@='.Qs4g
* @author treeroot sNvT0
* @since 2006-2-2 g)$Pvfc
* @version 1.0 d5A!kU _.
*/ =[{Pw8['
public class QuickSort implements SortUtil.Sort{ *U54x
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/* (non-Javadoc) 8tA.d.8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (%#d._j>fZ
*/ 77i |a]Kd
public void sort(int[] data) { F:pXdU-xf
quickSort(data,0,data.length-1); H.idL6*G
} !u6~#.7
private void quickSort(int[] data,int i,int j){ ,zXL8T
int pivotIndex=(i+j)/2; )SA$hwR
//swap A ws#>l<
SortUtil.swap(data,pivotIndex,j); <Dm6CH
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int k=partition(data,i-1,j,data[j]); |~\K:[T&
SortUtil.swap(data,k,j); Od&M^;BQ
if((k-i)>1) quickSort(data,i,k-1); sTG+c E
if((j-k)>1) quickSort(data,k+1,j); b V9Z[[\
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} T@yH.4D
/** @O45s\4-*
* @param data @0
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* @param i {6%uNT>|
* @param j N7oMtlvL[w
* @return 5?O/Aub
*/ l*v([@A\
private int partition(int[] data, int l, int r,int pivot) { xh-[]Jz(
do{ =\XAD+
while(data[++l] while((r!=0)&&data[--r]>pivot); *0c
}`|
SortUtil.swap(data,l,r); NPoXz
} MxdfuFss
while(l SortUtil.swap(data,l,r); BB%(!O4Dl
return l; ';ZJuJ.
} dlT\VWMha(
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} !r
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改进后的快速排序: %x927I>
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package org.rut.util.algorithm.support; cEqh|Q
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import org.rut.util.algorithm.SortUtil; `PW=_f={
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/** ^m+W
* @author treeroot =d5!O~}r>
* @since 2006-2-2 gx6&'${=#
* @version 1.0 \
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*/ ks r5P~
public class ImprovedQuickSort implements SortUtil.Sort { ,Tz
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private static int MAX_STACK_SIZE=4096; {30<Vc=
private static int THRESHOLD=10; b?Jm)
/* (non-Javadoc) 0sUc6_>e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &.z/dFmG
*/ B_&PK7vA
public void sort(int[] data) { L_.}z)S[\
int[] stack=new int[MAX_STACK_SIZE]; p!a%*LfND
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int top=-1; F0JFx$AoD
int pivot; ?hmb"^vlG
int pivotIndex,l,r; x$Oz0 [
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stack[++top]=0; YiJu48J
stack[++top]=data.length-1; lET)<V(Y
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while(top>0){ u#,]>;
int j=stack[top--]; kC
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int i=stack[top--]; >ahj|pm
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pivotIndex=(i+j)/2; y2U:( H:l!
pivot=data[pivotIndex]; 8$vH&HdI
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SortUtil.swap(data,pivotIndex,j); -,;Ep'
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//partition :A'!u r=\
l=i-1; ks5'Z8X
r=j; ?c2TT
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do{ ^pjez+
while(data[++l] while((r!=0)&&(data[--r]>pivot)); @Y,F&8a$
SortUtil.swap(data,l,r); UBVb#FNF
} _UBI,Dg]
while(l SortUtil.swap(data,l,r); 16>uD;G
SortUtil.swap(data,l,j); @ 7?_Yw
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if((l-i)>THRESHOLD){ SIlg
stack[++top]=i; }j?S?= ;m=
stack[++top]=l-1; @5y(>>C}8%
} &~%@QC/
if((j-l)>THRESHOLD){ e%U*~{m+
stack[++top]=l+1; ' XF`&3i
stack[++top]=j; 6.|~~/
} 8w&rj-
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} {K:Utdu($q
//new InsertSort().sort(data); R`Lm"5w
insertSort(data); j;v%4G
} kYB
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/** 7fay:_
* @param data v-3zav
*/ lX*;KHT )
private void insertSort(int[] data) { V,+[XB
int temp; o"FiM5L^.
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1);
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} `t1$Ew<
} $3'+V_CZ3
} 0s|LK
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} EYxRw
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