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快速排序: jA2%kX\6//
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package org.rut.util.algorithm.support; )mI>2<Z!
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import org.rut.util.algorithm.SortUtil; q^6#.}
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/** hyJ&~i0P{J
* @author treeroot ToKG;Ff 4b
* @since 2006-2-2 R=48:XG3/K
* @version 1.0 =d<~:!)
*/ m+7%]$
public class QuickSort implements SortUtil.Sort{ !B#lZjW#
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/* (non-Javadoc) Khv}q.)F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :5&UWL|
*/ xzfugW
public void sort(int[] data) { U6wy^!_X9
quickSort(data,0,data.length-1); J(~1mIJjC
} ~#VDJ[Z
private void quickSort(int[] data,int i,int j){ P*}aeu&lnD
int pivotIndex=(i+j)/2; khT[
//swap 2*cc26o
SortUtil.swap(data,pivotIndex,j); #u+qV!4
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int k=partition(data,i-1,j,data[j]); @q>#]8
SortUtil.swap(data,k,j); xQzW6H|
if((k-i)>1) quickSort(data,i,k-1); lgK5E*^
if((j-k)>1) quickSort(data,k+1,j); FL^t}vA
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} yA*U^:%
/** c68y\
* @param data 5 A5t
* @param i -#G>`T~
* @param j ,Csjb1
* @return P*%P"g
*/ <tsexsw
private int partition(int[] data, int l, int r,int pivot) { i|,}y`C#
do{ H"Hl~ ~U
while(data[++l] while((r!=0)&&data[--r]>pivot); l=Jw6F+5
SortUtil.swap(data,l,r); /[/{m ]
} <"3${'$k`
while(l SortUtil.swap(data,l,r); lx2%=5+i;
return l; /CKn XU;
} U1fqs{>
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} cH:&S=>h
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改进后的快速排序: pXBh^
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package org.rut.util.algorithm.support; +R;LHRS%
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import org.rut.util.algorithm.SortUtil; (~5]1S}F
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/** 8cMX=P
* @author treeroot `)KGajB
* @since 2006-2-2 MF*4E9Ue.
* @version 1.0 |)0Ta9~
*/ (n2_HePE
public class ImprovedQuickSort implements SortUtil.Sort { 3,*A VcQA
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private static int MAX_STACK_SIZE=4096; WD[jEWMV7D
private static int THRESHOLD=10; luac
/* (non-Javadoc) |f1^&97=+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZWjje6
*/ s?k:X ~m
public void sort(int[] data) { >\J<`
int[] stack=new int[MAX_STACK_SIZE]; 1P'L<z
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int top=-1; '"LaaTTs
int pivot; &m9= q|;m
int pivotIndex,l,r; BXxJra/V
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stack[++top]=0; (Nd)$Oq[4
stack[++top]=data.length-1; hPGDN\#LD
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while(top>0){ oOubqx
int j=stack[top--]; Z0'LD<
int i=stack[top--]; mF4OLG3L0
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pivotIndex=(i+j)/2; E KN<KnU%
pivot=data[pivotIndex]; i$hWX4L
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SortUtil.swap(data,pivotIndex,j); T/%Y_.NtU
,VUOsNN4\
//partition KIWHn_ :
l=i-1; %Q.M& U
r=j; RF
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do{ #SI]^T|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); E&Lml?@
SortUtil.swap(data,l,r); 60e{]}Z
} DR]oK_
while(l SortUtil.swap(data,l,r); gQu!(7WLI
SortUtil.swap(data,l,j); X>o*eN
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if((l-i)>THRESHOLD){ v6! `H
stack[++top]=i; -!M>;M@
stack[++top]=l-1; IkA~+6UY
} W>&*.3{v
if((j-l)>THRESHOLD){ 6L
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stack[++top]=l+1; Uqj$itqUQ
stack[++top]=j; =>Qd
} u$ o19n
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} I*a.!/$)
//new InsertSort().sort(data); Ytqx0
insertSort(data); Hl{ul'o
} g_>E5z.
/** n? =O@yq
* @param data {3K]Q=
*/ OH]45bd
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private void insertSort(int[] data) { 4W E)2vkS
int temp; $ER$|9)KD
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); I)r6*|mz
} e85E+S%
} MAX?,-x
} 9q&~!>lt
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} Q4S:/"*v8
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