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快速排序: cZ,_O~
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package org.rut.util.algorithm.support; Q?q
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import org.rut.util.algorithm.SortUtil; Sy~Mh]{E
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/** EZFWxR/
* @author treeroot
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* @since 2006-2-2 [O'p&j@
* @version 1.0
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*/ y->iv%
public class QuickSort implements SortUtil.Sort{ h Nwb.[
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/* (non-Javadoc) O*7~t17
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;RYKqUE
*/ C $;~=
public void sort(int[] data) { G)`MoVH1
quickSort(data,0,data.length-1); #v<+G=r*O
} gr7_oJ:R
private void quickSort(int[] data,int i,int j){ &0TheY;srf
int pivotIndex=(i+j)/2; K!mgh7Dx
//swap ' ga2C\)
SortUtil.swap(data,pivotIndex,j); 5sUnEHN
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int k=partition(data,i-1,j,data[j]); $<#sCrNX
SortUtil.swap(data,k,j); '%4,!
if((k-i)>1) quickSort(data,i,k-1); Ks-><-2+N
if((j-k)>1) quickSort(data,k+1,j); 19DW~kvYk
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} c eX*|B@=
/** BcWReyO<M
* @param data >oNs_{
* @param i ];YOP%2
* @param j 03y<'n
* @return .?TVBbc%5
*/ \k8_ZJw
private int partition(int[] data, int l, int r,int pivot) { }#M|3h;q9+
do{ TjdY Ck]'
while(data[++l] while((r!=0)&&data[--r]>pivot); fE iEy%o
SortUtil.swap(data,l,r); xg&vZzcl
} P{ o/F
while(l SortUtil.swap(data,l,r); +aap/sYp
return l; 5kz`_\&
} 4RNzh``u
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} |Can
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改进后的快速排序: $Re
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package org.rut.util.algorithm.support; FE.:h'^h
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import org.rut.util.algorithm.SortUtil; ^q$sCt}
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/** +X%yF{^m(
* @author treeroot X-)6.[9f
* @since 2006-2-2 j.sf FS
* @version 1.0 \uH;ng|m
*/ Rh|&{Tf
public class ImprovedQuickSort implements SortUtil.Sort { e"Z~%,^A
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private static int MAX_STACK_SIZE=4096; x.I-z@\E
private static int THRESHOLD=10; cD]t%`*
/* (non-Javadoc) P=.W.oS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P t$7U[N
*/ hO8B]4=&*
public void sort(int[] data) { a,.9eHf
int[] stack=new int[MAX_STACK_SIZE]; y)2]:nD`B
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int top=-1; C|+5F,D
int pivot; 4I$#R
int pivotIndex,l,r; _#I0m(
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stack[++top]=0; e5dw q
stack[++top]=data.length-1; w$_ooQ(_;Q
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while(top>0){ JkTL+obu
int j=stack[top--]; rz(DZ V
int i=stack[top--]; d{Z
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pivotIndex=(i+j)/2; mT;z `*
pivot=data[pivotIndex]; :gmVX}
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SortUtil.swap(data,pivotIndex,j); zPn8>J<.0Q
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//partition xZhh%~
l=i-1; 0z.&
r=j; 7ORwDR,`5
do{ <5
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); C M(g4fh
SortUtil.swap(data,l,r); 0W@C!mD~
} `KZ}smMA
while(l SortUtil.swap(data,l,r); !HFwQGP.Y
SortUtil.swap(data,l,j); 7J\I%r
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if((l-i)>THRESHOLD){ wx<DzC
stack[++top]=i; [e (-
stack[++top]=l-1; 3=z'Ih`
} ,%u\2M
if((j-l)>THRESHOLD){ |yS4um(w
stack[++top]=l+1; |m ~|
stack[++top]=j; 0@2%pIq\
} + IMP<
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} :t(}h!7
//new InsertSort().sort(data); 'O
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insertSort(data); U^.$k-|k
} Fik*7!XQ8
/** ;kdJxxUox
* @param data b8O:@j2
*/ JAYom%A"
private void insertSort(int[] data) { +K&ze:-Z
int temp; hsi#J^n{
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); =fm/l-P@
} Mv_4*xVc
} 0&<{o!>k
} O\xUv
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} >LLFe~9`g
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