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快速排序: -F+
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package org.rut.util.algorithm.support; LMF@-j%
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import org.rut.util.algorithm.SortUtil; bu
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/** 4=T.rVS[
* @author treeroot ^>3q@,C]c
* @since 2006-2-2 sFvu@Wm'7W
* @version 1.0 I&jiH)
*/ q3CcXYY
public class QuickSort implements SortUtil.Sort{ ecZT|X4u
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/* (non-Javadoc) ?
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) YoT<]'
*/ d[p-zn.
public void sort(int[] data) { rKtr&w7X
quickSort(data,0,data.length-1); dE`a1H%
} 42Qfv%*c
private void quickSort(int[] data,int i,int j){ gHB*u!w7Z
int pivotIndex=(i+j)/2; ^ |xSU_wa
//swap }r+(Z.BHM
SortUtil.swap(data,pivotIndex,j); 7jZE(|G-
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int k=partition(data,i-1,j,data[j]); u@ "nVHgMJ
SortUtil.swap(data,k,j); a
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if((k-i)>1) quickSort(data,i,k-1); )yOdRRP
if((j-k)>1) quickSort(data,k+1,j); 9HtzBS
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} uVQH,NA,
/** b!h*I>`
* @param data 9ozK}Cg4
* @param i 4=Wtv/
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* @param j ]WO0v`xh
* @return ,bLHkBK
*/ aR2Vvo
private int partition(int[] data, int l, int r,int pivot) { T&ECGF;Y/
do{ >Z\{P8@k0
while(data[++l] while((r!=0)&&data[--r]>pivot); doERBg`Jh
SortUtil.swap(data,l,r); MHm=X8eg
} G[pDKELL
while(l SortUtil.swap(data,l,r); d,c8ks(
return l; U)PNY
} aLWNqe&1
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} 3Y
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改进后的快速排序: lU}y%J@
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package org.rut.util.algorithm.support; xYg G
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import org.rut.util.algorithm.SortUtil; g}vOp3^
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/** QXQ'QEG
* @author treeroot e1EFZ,EcaO
* @since 2006-2-2 <#[_S$54
* @version 1.0 6c?;-5.
*/ U:a-Wi+
public class ImprovedQuickSort implements SortUtil.Sort { 5*q!:$
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private static int MAX_STACK_SIZE=4096; ,D6hJ_:
private static int THRESHOLD=10; Ez= Q{g
/* (non-Javadoc) e13{G@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Zgw;AY.R>
*/ 7eM:YqT/#
public void sort(int[] data) { s y ]k
int[] stack=new int[MAX_STACK_SIZE]; u(Y! _
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int top=-1; -$@$
int pivot; +5zLQ>]z
int pivotIndex,l,r; d-W@/J
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stack[++top]=0; t7t?xk!2
stack[++top]=data.length-1; ~)ZMGx
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while(top>0){ FR7DuH/f)
int j=stack[top--]; DR d|m<Z
int i=stack[top--]; 5`!Bj0Uf
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pivotIndex=(i+j)/2; 3!&PI
pivot=data[pivotIndex]; o!\Q,
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SortUtil.swap(data,pivotIndex,j); HFtl4P
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//partition s!vvAD;\
l=i-1; P
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r=j; Ew&pwsQ
do{ $,mljJSQv
while(data[++l] while((r!=0)&&(data[--r]>pivot)); GH6 HdZ
SortUtil.swap(data,l,r); W-pN
} C\Y%FTS:
while(l SortUtil.swap(data,l,r); h~!KNF*XW
SortUtil.swap(data,l,j); >nqDUGnEo>
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if((l-i)>THRESHOLD){ U#u=9%'
stack[++top]=i; 3? R56$-+
stack[++top]=l-1; L,(H(GeX
} <wIz8V
if((j-l)>THRESHOLD){ x)wlp{rLf
stack[++top]=l+1; 5-=&4R\k
stack[++top]=j; 4TPAD)C
} S
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} D?)^{)49
//new InsertSort().sort(data); E`"<t:RzF
insertSort(data); c}QWa"\2n
} L.E6~Rv
/** a/k0(
* @param data csEF^T-
*/ w_>SxSS7
private void insertSort(int[] data) { }o'WR'LX
int temp; ]12ypcf
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); xT]|78h$
} Pl>BTo>p'
} BE#s@-zR=p
} LU=<?"N6
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} c,v?2*<
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