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快速排序: '{~ej:
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package org.rut.util.algorithm.support; ,%^0 4sl
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import org.rut.util.algorithm.SortUtil; + u+fEg/A
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/** G[ea@u$?
* @author treeroot /cn_|DwN5
* @since 2006-2-2 k[m-"I%ZFX
* @version 1.0 #Ba'k6b
*/ 3@JwL{C
public class QuickSort implements SortUtil.Sort{ 3WHH3co[
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/* (non-Javadoc) |d8o<Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vC1 `m
*/ zrM|8Cu
public void sort(int[] data) { im"v75 tc
quickSort(data,0,data.length-1); I`l<}M
} xOH@V4z:
private void quickSort(int[] data,int i,int j){ 8?!Vr1x
int pivotIndex=(i+j)/2; jw)t"S/E
//swap >?tpGEZ\
SortUtil.swap(data,pivotIndex,j); inPGWG K]
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int k=partition(data,i-1,j,data[j]); Mtlj I6
SortUtil.swap(data,k,j); o/#e
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if((k-i)>1) quickSort(data,i,k-1); j~0hAKHG
if((j-k)>1) quickSort(data,k+1,j); z#b6 aP
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} j.sf FS
/** !xSGZD=AD
* @param data n&^Rs)%v
* @param i ek<U2C_u#
* @param j z!tHn#
* @return t<-Iiq+tL
*/ $=
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private int partition(int[] data, int l, int r,int pivot) { d>f5Tl\E
do{ ~rD* Y.
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); a,.9eHf
} y)2]:nD`B
while(l SortUtil.swap(data,l,r); 9j/B3CjW
return l; Fa8>+
} |dO1w.x/
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改进后的快速排序: :Fh*4
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package org.rut.util.algorithm.support; H)Yv_gT
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import org.rut.util.algorithm.SortUtil; g_`8K,6ln
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/** \I>,j,c
* @author treeroot p-Z5 {by
* @since 2006-2-2 umciP
* @version 1.0 +-ue={'
*/ TAP/gN'
public class ImprovedQuickSort implements SortUtil.Sort { Rh39x-`Z
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private static int MAX_STACK_SIZE=4096; a,X3=+_K
private static int THRESHOLD=10; / wEr>[8S
/* (non-Javadoc) )57OZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n']@Spm
*/ !HFwQGP.Y
public void sort(int[] data) { 1'h?qv^(
int[] stack=new int[MAX_STACK_SIZE]; J?{uG8)
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int top=-1; mY-r:
int pivot; l`d=sOB^
int pivotIndex,l,r; 9,4a?.*4~
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stack[++top]=0; iC
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stack[++top]=data.length-1; g\2Y605DM
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while(top>0){ 0=~Ji_5mB
int j=stack[top--]; Zu!3RN[lp?
int i=stack[top--]; R6ywc"xE
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pivotIndex=(i+j)/2;
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pivot=data[pivotIndex]; L_/.b%0)
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SortUtil.swap(data,pivotIndex,j); Gz`Zp "i%0
c#_%|gg
//partition $OmtN"
l=i-1; p[cC%3
r=j; <~3@+EEM
do{ {aU~[5L3(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); FG?B:Zl%T
SortUtil.swap(data,l,r); U]_1yX
} N52N ^X>
while(l SortUtil.swap(data,l,r); FJ/kumq
SortUtil.swap(data,l,j); % 30&6 "
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if((l-i)>THRESHOLD){ CpA=DnZ
stack[++top]=i; ~s+\Y/@A
stack[++top]=l-1; ).LJY<A
} h.PY$W<
if((j-l)>THRESHOLD){ F<oJ
stack[++top]=l+1; _TH'v:C
stack[++top]=j; o)w'w34FCT
} =VDN9-/.
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} VF;%Z
//new InsertSort().sort(data); =>&d[G[m!
insertSort(data); L,n'G%
} p=p,sJ/@
/** th !Gc
* @param data RE*;nSVFt
*/ wqJH
private void insertSort(int[] data) { VsFRG;:\U
int temp; t~e.LxN
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); [(]uin+9Q
} s3oK[:/
} !s5 _JO
} :Z,zWk1|
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