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快速排序: <G /a-Z
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package org.rut.util.algorithm.support; Rc#c^F<
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import org.rut.util.algorithm.SortUtil; #<81`%
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/** f"aqg/l
* @author treeroot Jl@YBzDfF
* @since 2006-2-2 8fC5O
* @version 1.0 HImQ.y!B
*/ fDrjR6xV
public class QuickSort implements SortUtil.Sort{ fYiof]v@_m
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/* (non-Javadoc) UhbGU G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @2/xu
*/ n}3fItSJ
public void sort(int[] data) { y1t,i.
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quickSort(data,0,data.length-1); bq"dKN`
} >slGicZ0
private void quickSort(int[] data,int i,int j){ 5uO.@0
int pivotIndex=(i+j)/2; ]}d.h!`<)
//swap iu'At7
SortUtil.swap(data,pivotIndex,j); C7_nA:Rc
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int k=partition(data,i-1,j,data[j]); O>/&-Wk=
SortUtil.swap(data,k,j); ~pPj
if((k-i)>1) quickSort(data,i,k-1); Y~P*
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if((j-k)>1) quickSort(data,k+1,j); [_1K1i"m
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} `Oe"s_O#
/** *ulkqpO
* @param data ;{Tf:j'g
* @param i }HxC~J"
* @param j ]?UK98uS\A
* @return 6GsB*hW
*/ 2<TpNGXM_
private int partition(int[] data, int l, int r,int pivot) { U$EQeb
do{ KCi0v
while(data[++l] while((r!=0)&&data[--r]>pivot); gmdA1$c
SortUtil.swap(data,l,r); >L,Pw1Y0W[
}
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while(l SortUtil.swap(data,l,r); *4O9W8Qz
return l; yBnUz"
} ^wMZG'/
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} zTW)SX_O
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改进后的快速排序: p.x!dt\1kC
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package org.rut.util.algorithm.support; Vy@0Got5=
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import org.rut.util.algorithm.SortUtil; 3GM9ZPeN:
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/** NzG] nsw
* @author treeroot 6'ia^om
* @since 2006-2-2 Ae^Idz
* @version 1.0 F~zrg+VDjL
*/ f#|
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public class ImprovedQuickSort implements SortUtil.Sort { %Z{ 7*jtE
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private static int MAX_STACK_SIZE=4096; A ?ij
private static int THRESHOLD=10; \ 3FOI
/* (non-Javadoc) M1 _1(LSU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P>qDQ1
*/ 6+W`:0je
public void sort(int[] data) { 'WcP+4c
int[] stack=new int[MAX_STACK_SIZE]; {7d\du&G
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int top=-1; C#:L.qK
int pivot; VD+y4t'^
int pivotIndex,l,r; z0xw0M+X
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stack[++top]=0; 0%;y'd**Ck
stack[++top]=data.length-1; *L=F2wW
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while(top>0){ TA>28/U#
int j=stack[top--]; *IV_evgM7
int i=stack[top--]; nx|b9W<
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pivotIndex=(i+j)/2; zz1]6B*eX
pivot=data[pivotIndex]; 1D2Yued
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SortUtil.swap(data,pivotIndex,j); eWU@@$9
7cly{U"
//partition <BhNmEo)2
l=i-1; V J]S"
r=j; SEsLJ?Dv0
do{ _>(qQ-Px
while(data[++l] while((r!=0)&&(data[--r]>pivot)); &*;E wfgZ
SortUtil.swap(data,l,r); nYts[f9e
} cB|Rj}40v
while(l SortUtil.swap(data,l,r); :WAFBK/x
SortUtil.swap(data,l,j); O%p+P<J
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if((l-i)>THRESHOLD){ Q}kXxud
stack[++top]=i; ;*q
stack[++top]=l-1; qN(,8P\90
} ]n^TN
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if((j-l)>THRESHOLD){ T5? eb"
stack[++top]=l+1; k C=h[<'
stack[++top]=j; be+tAp`
} o 12wp
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} ZmzYJ$:6
//new InsertSort().sort(data); hVdPO
insertSort(data); yvt
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} Pef$-3aP>E
/** prCr"y` M
* @param data <v[UYvZvY
*/ Ncsk~=[
private void insertSort(int[] data) { q+?>shqsZ
int temp; :Kx6|83
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); >Z!H9]f(
} 2sOetmWE7
} g"|Z1iy|9
} V
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} 9t o2V
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