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快速排序: SOi(5]
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package org.rut.util.algorithm.support; `Q!FMv6Y^
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import org.rut.util.algorithm.SortUtil; gE]a*TOZk
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/** R4K eUn"
* @author treeroot N5I W@?4
* @since 2006-2-2 dBi3ZCAF
* @version 1.0 VG*=)8{
*/ RQ$o'U9A
public class QuickSort implements SortUtil.Sort{ ;74DT
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/* (non-Javadoc) XxrO:$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) z2EI"'4\9
*/ !WVabdt
public void sort(int[] data) { $SD@D6`lL
quickSort(data,0,data.length-1); l{7Dv1[Ss
} \T#(rt\j
private void quickSort(int[] data,int i,int j){ XP
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int pivotIndex=(i+j)/2; 2l}FgD
//swap kgI.kT(=
SortUtil.swap(data,pivotIndex,j); +'6ea+$
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int k=partition(data,i-1,j,data[j]); xhoLQD
SortUtil.swap(data,k,j); r^Rcjyc1
if((k-i)>1) quickSort(data,i,k-1); '-1jWw:8
if((j-k)>1) quickSort(data,k+1,j); H9a3rA>
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} vpr@
/** 7^Q$pT>
* @param data +^% &8<
* @param i :!*;0~#
* @param j jwE(]u
* @return =v#A&IPA'
*/ t2%bHIG}
private int partition(int[] data, int l, int r,int pivot) { n<(5B|~y
do{ ."@a1_F|
while(data[++l] while((r!=0)&&data[--r]>pivot); +sq,!6#G
SortUtil.swap(data,l,r); '~x_
} 6"c!tJc7j
while(l SortUtil.swap(data,l,r); @42lpreT
return l; !/q&0 a
} 6'lT`E|
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} F#C 6.`B
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改进后的快速排序: VlXy&oZ
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package org.rut.util.algorithm.support; c3 ]^f6)?
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import org.rut.util.algorithm.SortUtil; lSsFI30
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/** G5@fqh6ws
* @author treeroot 9'L0Al~L
* @since 2006-2-2 ^*~u4app
* @version 1.0 g,]5&C T3v
*/ >Zp]vK~s
public class ImprovedQuickSort implements SortUtil.Sort { x/q$RcDOm
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private static int MAX_STACK_SIZE=4096; +?g,&NE
private static int THRESHOLD=10; I6Q_A
/* (non-Javadoc) V<I${i$]0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <cc0 phr
*/ 0'2{[xF
public void sort(int[] data) { z:,!yU c
int[] stack=new int[MAX_STACK_SIZE]; #AnSjl
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int top=-1; ?mUu(D:7D
int pivot; u:kY4T+Z
int pivotIndex,l,r; lNPbU ~k
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stack[++top]=0; :iC\#i]6
stack[++top]=data.length-1; 8$olP:d
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while(top>0){ `lOoT
int j=stack[top--]; JF=ABJ=
int i=stack[top--]; rNO;yL4)ey
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pivotIndex=(i+j)/2; 51'SA
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pivot=data[pivotIndex]; -k{R<L
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SortUtil.swap(data,pivotIndex,j); #I wB
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//partition VO6y9X"
l=i-1; NUtyUv
r=j; $q+`GXc-
do{ 9\0 K%LL
while(data[++l] while((r!=0)&&(data[--r]>pivot)); / kGX 6hh
SortUtil.swap(data,l,r); mwhn=y#]*
} m?`Rl6!@8\
while(l SortUtil.swap(data,l,r); ml2z
SortUtil.swap(data,l,j); H)+kN'J
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if((l-i)>THRESHOLD){ H
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stack[++top]=i; .NC}TFN|
stack[++top]=l-1; /)|y+<E]}
} Q~{@3<yEI
if((j-l)>THRESHOLD){ PyF4uCn"H
stack[++top]=l+1; ~` hcgCi%
stack[++top]=j; #|i{#~gxM
} l
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} 8[ OiG9b
//new InsertSort().sort(data); ufPQ~,.
insertSort(data); 0/]vmDr
} lukV
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/** bb/MnhB
* @param data dY.uOafr
*/ 0^z$COCv
private void insertSort(int[] data) { ^IYN"yX_
int temp; i6kyfOI
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); mio'm
}
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} e8.bH#
} I,;)pWX=@
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} ')V5hKb^
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