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快速排序: Q`= ,&;T>
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package org.rut.util.algorithm.support; f%#q}vK-
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import org.rut.util.algorithm.SortUtil; ":igYh
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/** nulLK28q
* @author treeroot 3UXaA;
* @since 2006-2-2 7LotN6H
* @version 1.0 ^:hI bF4G
*/ NgI n\)
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public class QuickSort implements SortUtil.Sort{ Xg<R+o
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/* (non-Javadoc) N$&)gI:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) T( LlNq
*/ ~;)H |R5kV
public void sort(int[] data) { 5N~JRq\
quickSort(data,0,data.length-1); RX])#=Cs
} PvHX#wJ
private void quickSort(int[] data,int i,int j){ I='6>+P
int pivotIndex=(i+j)/2; 5`>%{ o
//swap rl/]Ym4j
SortUtil.swap(data,pivotIndex,j); pc+'/~
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int k=partition(data,i-1,j,data[j]); *OM+d$l!
SortUtil.swap(data,k,j); OdSglB
if((k-i)>1) quickSort(data,i,k-1); 8bTE#2+-
if((j-k)>1) quickSort(data,k+1,j); vyS8yJUY
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} Al}D~6MD
/** Sv#S_jh
* @param data b=$(`y
* @param i UiE 1TD{
* @param j Bjc<d,]
* @return wf` e3S
*/ Y'&rSHI"
private int partition(int[] data, int l, int r,int pivot) { ,#V}qSKUS
do{ 1#Q~aY
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); pB;8yz=
} 59k[A~)~
while(l SortUtil.swap(data,l,r); XbaUmCuh
return l; cqd}.D
} $:}sm0;
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} fUKi@*^ZUa
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改进后的快速排序: :iEIo7B
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package org.rut.util.algorithm.support; `fM]3]x>
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import org.rut.util.algorithm.SortUtil; KAI/*G\z
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/** Ge_Gx*R
* @author treeroot e8,!x9%J
* @since 2006-2-2 %=*nJvYS
* @version 1.0 *]K/8MbiF
*/ o=)["V
public class ImprovedQuickSort implements SortUtil.Sort { <FofRFaS
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private static int MAX_STACK_SIZE=4096; N~!
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private static int THRESHOLD=10; sZh| <2
/* (non-Javadoc) lHI?GiB@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y'U]!c9
*/ n4A#T#D!t3
public void sort(int[] data) { s`dwE*~
int[] stack=new int[MAX_STACK_SIZE]; +@mgb4_
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int top=-1; aH'=k?Of;
int pivot; 8#h~J>u.
int pivotIndex,l,r; HceZT e@
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stack[++top]=0; 4?',E ddo
stack[++top]=data.length-1; V2oXg
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while(top>0){ :8LK}TY7
int j=stack[top--]; phP%
int i=stack[top--]; =IEei{
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pivotIndex=(i+j)/2; Mh@RO|F
pivot=data[pivotIndex]; {^A,){uX]
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SortUtil.swap(data,pivotIndex,j); 4S\S t<
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//partition 79d<,q;uR
l=i-1; Sau?Y
r=j; [J\! 2\Oo
do{ g!I0UAm
while(data[++l] while((r!=0)&&(data[--r]>pivot)); OhiY <
SortUtil.swap(data,l,r); iPK:gK3Q
} !.cno&
while(l SortUtil.swap(data,l,r); &]S\GnqlU]
SortUtil.swap(data,l,j); j<PpCL_8%
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if((l-i)>THRESHOLD){ e\95X{_'
stack[++top]=i; zW:r7
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stack[++top]=l-1; \H{UJ
} $Ma*q EB
if((j-l)>THRESHOLD){ z;lWr(-x
stack[++top]=l+1; _)a!g-Do7
stack[++top]=j; cL+bMM$4r~
} 5c 6 9M5
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} ['_W<
//new InsertSort().sort(data); CT[CM+
insertSort(data); JWVn@)s
} |0$7{nQ
/** `7
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* @param data JrGY`6##p
*/ hOR1RB
private void insertSort(int[] data) { xY@<