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快速排序: [1S|dc>.O%
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package org.rut.util.algorithm.support; 2GDD!w#!j
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import org.rut.util.algorithm.SortUtil; $|@
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/** ) AvN\sC
* @author treeroot
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* @since 2006-2-2 %WjXg:R
* @version 1.0 A
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*/ =c\>(2D
public class QuickSort implements SortUtil.Sort{ gi1^3R[
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/* (non-Javadoc) &OH={Au
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) m+]K;}.}R
*/ NXrJfp
public void sort(int[] data) { g,!L$,/F
quickSort(data,0,data.length-1); p$]3'jw
} V2wb%;q
private void quickSort(int[] data,int i,int j){ u 7>],<
int pivotIndex=(i+j)/2; {8W'%\!=
//swap GjvOM y
SortUtil.swap(data,pivotIndex,j); +V{kb<P
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int k=partition(data,i-1,j,data[j]); p8Qk'F=h
SortUtil.swap(data,k,j); -(;26\lE
if((k-i)>1) quickSort(data,i,k-1); V_ .5b&@
if((j-k)>1) quickSort(data,k+1,j); | ATvS2
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} u04kF^
/** 52Z2]T
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* @param data "#2a8#
* @param i TNe l/
* @param j ;n*.W|Uph
* @return "*e$aTZB\
*/ C)ERUH2i
private int partition(int[] data, int l, int r,int pivot) { f<d`B]$(
do{ I-]?"Q7Jz
while(data[++l] while((r!=0)&&data[--r]>pivot); {EB;h\C
SortUtil.swap(data,l,r); *av<E
} |\pj;XU
while(l SortUtil.swap(data,l,r); B"1c
return l; l<58A7
} c tZ uA+
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} 2*;~S44
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改进后的快速排序: P64PPbP
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package org.rut.util.algorithm.support; KOk4^#h@
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import org.rut.util.algorithm.SortUtil; M2,l7
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/** 'T*&'RQr
* @author treeroot _7Ju
* @since 2006-2-2 /L
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* @version 1.0 WUn]F~Lt
*/ JzQ_{J`k
public class ImprovedQuickSort implements SortUtil.Sort { @e.C"@G
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private static int MAX_STACK_SIZE=4096; \h/H#jZJ
private static int THRESHOLD=10; $f
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/* (non-Javadoc) U`(ee*}o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'x#~'v*
*/ EU/C@B2*Dl
public void sort(int[] data) { NZ:,ph
int[] stack=new int[MAX_STACK_SIZE]; mp1@|*Sn
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int top=-1; ?=sDM& '
int pivot; :D5Rlfj
int pivotIndex,l,r; TQF| a\M'
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stack[++top]=0; z#wkiCRYm
stack[++top]=data.length-1; gD@){Ip
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while(top>0){ y%cP1y)
int j=stack[top--]; Z"xvh81P
int i=stack[top--]; `r6 ,+&
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pivotIndex=(i+j)/2; yS'I[l
pivot=data[pivotIndex]; 7;(`MIFXs
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SortUtil.swap(data,pivotIndex,j); kiaw4_
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//partition /{g>nzP
l=i-1; (mpNcOY<D
r=j; b{&)6M)zo
do{ s/#!VnU6
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Se}c[|8
SortUtil.swap(data,l,r); 97*p+T<yp
} NH4#
while(l SortUtil.swap(data,l,r); <)H9V-5aZ
SortUtil.swap(data,l,j); ~q.F<6O
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if((l-i)>THRESHOLD){ x|Bf-kc[#Q
stack[++top]=i; *w\W/ Y
stack[++top]=l-1; YK'<NE3 4
} .*Y
if((j-l)>THRESHOLD){ BX7kO0j
stack[++top]=l+1; 013x8!i
stack[++top]=j; A?P_DA
} *])
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} 2HA:"v8
//new InsertSort().sort(data); R&k<AZ
insertSort(data); yNBfUj -L
} |/{=ww8|
/** !l8PDjAE
* @param data 583|blL
*/ Ve; n}mJ?
private void insertSort(int[] data) { @RKryY)
int temp; |)v,2
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); sDlO#
} sUQ@7sTj
} ?CPahU
} BW4J> {
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} ^u ~Q/4
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