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快速排序: (rIXbekgB
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package org.rut.util.algorithm.support; {Hr>X
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import org.rut.util.algorithm.SortUtil; ) G|"jFP
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/** ,O2q+'&
* @author treeroot $YPQC
* @since 2006-2-2 #r(a~
* @version 1.0 c8q G\\t[
*/ F'XlJ M
public class QuickSort implements SortUtil.Sort{ "h$D7 mL
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/* (non-Javadoc) /3s@6Ex}E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %;
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*/ @BXaA0F4
public void sort(int[] data) { Kn.iyR
quickSort(data,0,data.length-1); {o {#]fbO%
} |veBq0U
private void quickSort(int[] data,int i,int j){ t"tNtLI
int pivotIndex=(i+j)/2; C`pan /t
//swap [d\#[l_
SortUtil.swap(data,pivotIndex,j); }^Z< dbt
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int k=partition(data,i-1,j,data[j]); 6kC)\uy
SortUtil.swap(data,k,j); `u$24h'!
if((k-i)>1) quickSort(data,i,k-1);
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if((j-k)>1) quickSort(data,k+1,j); ;2BPPZ
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} /CbkqNV
/** r&=r/k2
* @param data ;=#qHo9k1%
* @param i Xz"
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* @param j .N&QW
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* @return /%;/pi
*/ ]Px:d+wX:
private int partition(int[] data, int l, int r,int pivot) { XGL"gD
do{ y^3,X_0
while(data[++l] while((r!=0)&&data[--r]>pivot); R4yJ.f
SortUtil.swap(data,l,r); ,d5ia4\K
}
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while(l SortUtil.swap(data,l,r); I ;l`VtD
return l; fq{I$syY
} 2AmR(vVa"
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} }WoX9M; 1
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改进后的快速排序: 31H|?cg<
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package org.rut.util.algorithm.support; X9SJ~n
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import org.rut.util.algorithm.SortUtil; Xp.|.)Od
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/** D=<t;+|
* @author treeroot \A~4\um
* @since 2006-2-2 =y`-sU Hx
* @version 1.0 H9/XW6W,"w
*/ EccFx7h
public class ImprovedQuickSort implements SortUtil.Sort { g}^4^88=a
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private static int MAX_STACK_SIZE=4096; v!iWzN
private static int THRESHOLD=10; 0GF%~6
/* (non-Javadoc) s8C:QC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A=y24m
*/ e$gaE</
public void sort(int[] data) { UqY J#&MqY
int[] stack=new int[MAX_STACK_SIZE]; nsy!p5o
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int top=-1; ^o,y5,
int pivot; m21QN9(i%
int pivotIndex,l,r; TZ)(ZKX*R
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stack[++top]=0; 3J23q
stack[++top]=data.length-1; tPQ2kEW
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while(top>0){ \t[
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int j=stack[top--]; }kpfJLjY
int i=stack[top--]; }x>}:"P;W
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pivotIndex=(i+j)/2; `W6:=H
pivot=data[pivotIndex]; Be'?#Qe
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SortUtil.swap(data,pivotIndex,j); ]KfghRUH
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//partition =lw4 H_
l=i-1; 9_I[o.q
r=j; o<9yaQ;
do{ _gis+f/8h
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 3(>(lk
SortUtil.swap(data,l,r); `kI?Af*;v
} 17?NR\Q
while(l SortUtil.swap(data,l,r); d{vc
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SortUtil.swap(data,l,j); PTfN+
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if((l-i)>THRESHOLD){ eG a#$x?.
stack[++top]=i; Z_ iQU1
stack[++top]=l-1; 7R%
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} $sB48LJuU'
if((j-l)>THRESHOLD){ T9&,v<f
stack[++top]=l+1; zzDNWPzsA
stack[++top]=j; e)fJd*P
} p7?CeyZ-V
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} NXC~#oG
//new InsertSort().sort(data); S}XB
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insertSort(data); 1t}
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} o+PQ;Dl
/** BZnp
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* @param data N>uZ t2
*/ Jv '3](
private void insertSort(int[] data) { Fj4l %=
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); 0%(4G83gw
} P"[ifsp
} WHdqO8
} j};pv 2
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} js%4;
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