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快速排序: gt@m?w(
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package org.rut.util.algorithm.support; #qK:J;Sn3
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import org.rut.util.algorithm.SortUtil; f&Gt|
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/** KV(Q;~8"X
* @author treeroot =ALTUV3/q
* @since 2006-2-2 bbE!qk;hEP
* @version 1.0 ?l9XAWt\
*/ 17%Mw@+
public class QuickSort implements SortUtil.Sort{ PGqQ@6B
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/* (non-Javadoc) 5>[u `
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z&1\{PG3*
*/ qm/)ku0
public void sort(int[] data) { ,U2*FZ["
quickSort(data,0,data.length-1); 'Gj3:-xqL
} 9Z4nAc
private void quickSort(int[] data,int i,int j){ RoPRQCE
int pivotIndex=(i+j)/2; a<^ v(r
//swap ~E17L]ete
SortUtil.swap(data,pivotIndex,j); 6 (]Dh;gC
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int k=partition(data,i-1,j,data[j]); p {T*k'
SortUtil.swap(data,k,j); ]'&LGA`
if((k-i)>1) quickSort(data,i,k-1); '=b/6@&
if((j-k)>1) quickSort(data,k+1,j); ;r<^a6B
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} h`^jyoF"(
/** dYJ(!V&
* @param data y
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* @param i UtoT
* @param j os=e|vkB*
* @return u_oaebOrpP
*/ k\5c|Wq|g
private int partition(int[] data, int l, int r,int pivot) { ~%<X0s|
do{ La`N PY_:>
while(data[++l] while((r!=0)&&data[--r]>pivot); ]Sf]J4eQ
SortUtil.swap(data,l,r); -t!~%_WCv
} (A9Fhun
while(l SortUtil.swap(data,l,r); rNXQf'*I
return l; zdB^S%cztS
} ~vm%6CABM
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} m*&]!mM"0G
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改进后的快速排序: aTH{'mN
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; 75T%g!c#
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/** ,wQ5.U,
* @author treeroot 'j#*6xD
* @since 2006-2-2 A8muQuj]~~
* @version 1.0 p|U?86t
*/ &6/[B_.
public class ImprovedQuickSort implements SortUtil.Sort { 9+Np4i@
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private static int MAX_STACK_SIZE=4096; R@1 xt@?
private static int THRESHOLD=10; luh$2 \5B
/* (non-Javadoc) f,U.7E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UXJeAE-
*/ &*M!lxDN
public void sort(int[] data) { "q3ZWNS'w
int[] stack=new int[MAX_STACK_SIZE]; ` Fa~
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int top=-1; ,0M_Bk"
int pivot; zu_8># i-
int pivotIndex,l,r; D+TD 95t
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stack[++top]=0; Ua:}V n&!
stack[++top]=data.length-1; I fK,b*%
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while(top>0){ YL!P0o13r
int j=stack[top--]; g];!&R-
int i=stack[top--]; p_RsU`[
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pivotIndex=(i+j)/2; l!D}3jD
pivot=data[pivotIndex]; ~[t[y~Hup
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SortUtil.swap(data,pivotIndex,j); b6,iZ+]
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//partition `'DmDg
l=i-1; 5AFJC?
r=j; k
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do{ .YtKS
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 4>wP7`/+y
SortUtil.swap(data,l,r); R$R *'l
} Zu*F#s!tUI
while(l SortUtil.swap(data,l,r); m+=] m_
SortUtil.swap(data,l,j); 8SMxw~9$
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if((l-i)>THRESHOLD){ owVX*&b{
stack[++top]=i; 8 ?xE6
stack[++top]=l-1; /:cd\A}
} ju8>:y8
if((j-l)>THRESHOLD){ 1KU!
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stack[++top]=l+1; M H|Og84
stack[++top]=j; #|uCgdi
} LP.]9ut
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} g_;\iqxL
//new InsertSort().sort(data); /J]5H
insertSort(data); jk;j2YNPw
} P0;n9>g
/** /p/]t,-j2
* @param data |Tv#4st
*/ z<MsKD0Q
private void insertSort(int[] data) { 9Gvd&U
int temp; s
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); lov!o:dJ
} (Lbbc+1m
} =O~_Q-
} 4S7v:1~xe
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