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快速排序: .|R4E
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package org.rut.util.algorithm.support; H2Wlgt
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import org.rut.util.algorithm.SortUtil; J({D~
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/** 2y^:T'p
* @author treeroot hd9HM5{p
* @since 2006-2-2 04;s@\yX4
* @version 1.0 =NC??e {
*/ (iir,Ks2C
public class QuickSort implements SortUtil.Sort{ 4l%W]'
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/* (non-Javadoc) x$BNFb%I1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E;C{i
*/ d:K\W[$Bz
public void sort(int[] data) { HFy9b|pjy
quickSort(data,0,data.length-1); .aY$-Y<
} ~d]v{<3
private void quickSort(int[] data,int i,int j){ Ri" hU/H{
int pivotIndex=(i+j)/2; vFR*3$R
//swap ,/b!Xm:
SortUtil.swap(data,pivotIndex,j); #d\&6'O
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int k=partition(data,i-1,j,data[j]); OriYt
SortUtil.swap(data,k,j); r@zT!.sc!
if((k-i)>1) quickSort(data,i,k-1); nD*iSb*
if((j-k)>1) quickSort(data,k+1,j); t
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} ,*6K3/kW
/** N?vb^?
* @param data zQY ,}a
* @param i [q[37;ZEQ
* @param j >{Hg+/
* @return B1nm?E 0i
*/ Ei @
private int partition(int[] data, int l, int r,int pivot) { L@(. i
do{ kpn|C 9r
while(data[++l] while((r!=0)&&data[--r]>pivot); xWzybuLp
SortUtil.swap(data,l,r); [//i "Nm
} xE?KJ
while(l SortUtil.swap(data,l,r); $Xlr@)%
return l; g-d{"ZXd J
} QNMZR
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}
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改进后的快速排序: 4DCh+|r
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package org.rut.util.algorithm.support; iXnXZ|M
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import org.rut.util.algorithm.SortUtil; ~-7/9$ay5
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/** 08nh y[
* @author treeroot
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* @since 2006-2-2 ,6g{-r-2
* @version 1.0 'D5J5+.z
*/ a`w=0]1&*
public class ImprovedQuickSort implements SortUtil.Sort { @r*GGI!
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private static int MAX_STACK_SIZE=4096; R'c dEoy
private static int THRESHOLD=10; $oQOOa@;i)
/* (non-Javadoc) WkA47+DsV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?; W"=I*3
*/ *Sj)9mp
public void sort(int[] data) { 6L8nw+mEK
int[] stack=new int[MAX_STACK_SIZE]; N+c|0
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int top=-1; L!Y|`P#Yr
int pivot; 8+oc4~!A@n
int pivotIndex,l,r; % E1r{`p
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stack[++top]=0; n?r8ZDJ'
stack[++top]=data.length-1; u?72]?SM
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while(top>0){ #0<pRDXj
int j=stack[top--]; 2Cp4aTGv#
int i=stack[top--]; EWDsBNZaI
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pivotIndex=(i+j)/2; JE9v+a{7
pivot=data[pivotIndex]; ^aAs=KditO
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SortUtil.swap(data,pivotIndex,j); ]gPx%c
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//partition I(~([F2
l=i-1; G)<B7-72;
r=j; S,:!H@~B
do{ O6y:e#0z
while(data[++l] while((r!=0)&&(data[--r]>pivot)); jV*10kM<
SortUtil.swap(data,l,r); !u]@Ru34
} As)?~dV
while(l SortUtil.swap(data,l,r); e#HPU
SortUtil.swap(data,l,j); /Kli C\
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if((l-i)>THRESHOLD){ +&G(AW
stack[++top]=i; 3'.3RKV
stack[++top]=l-1; _WWC8?6U
} -M=BD-_.h
if((j-l)>THRESHOLD){ n^[a}DX0
stack[++top]=l+1; k)>H=?mI
stack[++top]=j; jq)Bj#'7
} *]yrN`
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} q#AEu
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//new InsertSort().sort(data); eWv:wNouk
insertSort(data); ^oPFLez56
} SV t~pE+Y
/** fu\j
* @param data `e'wWV
*/ D@uVb4uK
private void insertSort(int[] data) { 72~L ?
int temp; :&
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); V6dq8Z"h
} Nut&g"u2
} ir.RO7f
} 0a:oC(Ak
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} bI0xI[#Q
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