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快速排序: C}RO'_Pq
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package org.rut.util.algorithm.support; IFp%Ta
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import org.rut.util.algorithm.SortUtil; g F*AS(9
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/** hF,|()E[
* @author treeroot nMyl(kF[
* @since 2006-2-2 #0P_\X`E
* @version 1.0 H;1@]|sH#
*/ P0n1I7|
public class QuickSort implements SortUtil.Sort{ "0An'7'm
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/* (non-Javadoc) !#c'|
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) by/H:5}7
*/ GXtK3YAr
public void sort(int[] data) { aj1]ZT\
quickSort(data,0,data.length-1); 7 $e 6H|j@
} SMX]JZmH
private void quickSort(int[] data,int i,int j){ N,Eap KG
int pivotIndex=(i+j)/2; mn/)_1',
//swap . 5(YL8d
SortUtil.swap(data,pivotIndex,j); K& #il
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int k=partition(data,i-1,j,data[j]); SO$Af!S:bB
SortUtil.swap(data,k,j); LjI`$r.B
if((k-i)>1) quickSort(data,i,k-1); X8$i*#D
if((j-k)>1) quickSort(data,k+1,j); `x[Is$
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} y7,I10:D
/** =SfNA
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* @param data >rCD5#DG
* @param i {o}U"b<+Ra
* @param j )L:zr#
* @return I=y7$+7%
*/ ><<>4(eF p
private int partition(int[] data, int l, int r,int pivot) { @NL cO}
do{ gM&IV{k3
while(data[++l] while((r!=0)&&data[--r]>pivot); ?b;2PH"
SortUtil.swap(data,l,r); $Nu{c;7"
} F8f}PV]b
while(l SortUtil.swap(data,l,r); h'y%TOob
return l; X-c|jn7
} w4U,7%V
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改进后的快速排序: 3p0v
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package org.rut.util.algorithm.support; $DL}jH^S
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import org.rut.util.algorithm.SortUtil; _K^Q]V[nZ
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/** 4&}%GH>}
* @author treeroot ytZ o0pad
* @since 2006-2-2 kxMvOB$
* @version 1.0 paqGW]
*/ $DY#04Je\=
public class ImprovedQuickSort implements SortUtil.Sort { Jo5B mh0
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private static int MAX_STACK_SIZE=4096; @/z\p7e
private static int THRESHOLD=10; M@Th^yF+8H
/* (non-Javadoc) v(1 [n]y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *f[5rr4
*/ ABWn49c.
public void sort(int[] data) { [,o:nry'a
int[] stack=new int[MAX_STACK_SIZE]; ,Z
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int top=-1; v e&d"8+]
int pivot; 7>N~l
int pivotIndex,l,r;
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stack[++top]=0; lsz3'!%Y)
stack[++top]=data.length-1; Rx-\B$G
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while(top>0){ Bs "D<r&ro
int j=stack[top--]; m2PUU/8B/
int i=stack[top--]; $*#a;w7\C
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pivotIndex=(i+j)/2; QAs)zl0
pivot=data[pivotIndex]; fAsb:P
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SortUtil.swap(data,pivotIndex,j); (RddR{mX
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//partition &jE\D^>ko
l=i-1; I!lDKS,b
r=j; YX$(Sc3.6
do{ )~
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); $ev+0m_
SortUtil.swap(data,l,r); Bqf(6\)F
} w*F[[*j@.
while(l SortUtil.swap(data,l,r); C[J9 =!t
SortUtil.swap(data,l,j); -D`1z?zHra
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if((l-i)>THRESHOLD){ /<rvaR
stack[++top]=i; J"`VA_[
stack[++top]=l-1; @<\oM]jX
} giakEPl
if((j-l)>THRESHOLD){ YYWD\Y`8
stack[++top]=l+1; eZ'8JU]
stack[++top]=j; j-<-!jTd
} eh86-tQI~(
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} ,'8%'xit
//new InsertSort().sort(data); roADC?@r
insertSort(data); W A/dt2D|
} uNyU]@R<W
/** ;ku>_sG-
* @param data Z)@vJZ*7(
*/ \5ls
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private void insertSort(int[] data) { n7t}G'*Y!^
int temp; r2-iISxg+
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); nBy-/BU&
} E'08'8y
} )U&9d
} %3z[;&*3O
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} V]H(;+^P
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