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快速排序: h)8+4?-4I
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package org.rut.util.algorithm.support; /\cu!yiX
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import org.rut.util.algorithm.SortUtil; U!:!]DX(
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/** ]t)M}^w
* @author treeroot |7zP8
* @since 2006-2-2 wp.e3l
* @version 1.0 \Z20fh2
*/ yM:~{;HLF
public class QuickSort implements SortUtil.Sort{ t *
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/* (non-Javadoc) _SC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]H#Rm#q
*/ &17,]# 3
public void sort(int[] data) { ef}E.Bl
quickSort(data,0,data.length-1); C6UMc}
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private void quickSort(int[] data,int i,int j){ #oJbrh9J6
int pivotIndex=(i+j)/2; >xV<nLf/
//swap 4Sstg57x~
SortUtil.swap(data,pivotIndex,j); QeeC2
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int k=partition(data,i-1,j,data[j]); M1]6lg[si
SortUtil.swap(data,k,j); x*&&?nV Iz
if((k-i)>1) quickSort(data,i,k-1); NQ!N"C3u
if((j-k)>1) quickSort(data,k+1,j); `x$}~rP&)!
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} w$lfR,
/** NnLhJPh
* @param data TdP{{&'9
* @param i zz 'dg-F
* @param j Uty(sDtu
* @return W]D`f8r9
*/ ))IgB).3M
private int partition(int[] data, int l, int r,int pivot) { >[XOMKgQ](
do{ ECS<l*i57&
while(data[++l] while((r!=0)&&data[--r]>pivot); n`m_S
SortUtil.swap(data,l,r); &@W4^-9
} \'??
while(l SortUtil.swap(data,l,r); /%uZKGP
return l; NT;x1
} iijd$Tv
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} sm2p$3v
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改进后的快速排序: V5yxQb
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package org.rut.util.algorithm.support; !$p2z_n$@.
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import org.rut.util.algorithm.SortUtil; {
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/** r*i$+ Z
* @author treeroot hy$MV3LP
* @since 2006-2-2 ' 1P=^
* @version 1.0 QN5yBa!Wz
*/ r,u<y_YW
public class ImprovedQuickSort implements SortUtil.Sort { X(r)Z\
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private static int MAX_STACK_SIZE=4096; 4f4 i1i:
private static int THRESHOLD=10; Yg=E@F
/* (non-Javadoc) O)R7t3t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t$]&,ucW#
*/ bK03S Vx
public void sort(int[] data) { f
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int[] stack=new int[MAX_STACK_SIZE]; -+3be(u
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int top=-1; {yvb$ND|j{
int pivot; /h?<MI\7V
int pivotIndex,l,r; My]+?.Ru
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stack[++top]=0; 6}VUD
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stack[++top]=data.length-1; G 2%
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while(top>0){ 94T}iY.
int j=stack[top--]; x @1px&^
int i=stack[top--]; N<KKY"?I'
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pivotIndex=(i+j)/2; V/aQ*V{
pivot=data[pivotIndex];
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SortUtil.swap(data,pivotIndex,j); JQ*D
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//partition 25x cD1*
l=i-1; Dz[566UD
r=j; '"oo;`g7
do{ \Os:6U=X-
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ^F>4~68d
SortUtil.swap(data,l,r); $Llta,ULE
} E9^(0\Z
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while(l SortUtil.swap(data,l,r); FQ+8J 7
SortUtil.swap(data,l,j); >HE,'
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if((l-i)>THRESHOLD){ /wr6\53J
stack[++top]=i; ;5<P|:^
stack[++top]=l-1; [!^cd%l
} g<fP:/
if((j-l)>THRESHOLD){ F
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stack[++top]=l+1; V?=TVI*k
stack[++top]=j; Was'A+GZ
} DYX-5~;!
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} WS5A Y @(~
//new InsertSort().sort(data); pP3U,n
insertSort(data); EY]a6@;
} }xqXd%uz
/** 6{Ks`Af
* @param data Z
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*/ 26M~<Ic
private void insertSort(int[] data) { ai4PM
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int temp; 5lO^;.cS,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); [6_"^jgH
} r]9 e^
} &RWM<6JP
} 9/G!0uE
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} c -w0
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