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快速排序: N\CHIsVm>
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package org.rut.util.algorithm.support; AOTtAV_e
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import org.rut.util.algorithm.SortUtil; 'CG% PjCO
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/**
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* @author treeroot vP%:\u:{
* @since 2006-2-2 #9qX:*>h
* @version 1.0 f&$$*a
*/ -7Kstc-
public class QuickSort implements SortUtil.Sort{ P4E_<v[
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/* (non-Javadoc) 6&2{V?
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _C'VC#Sy
*/ ]/[@.
public void sort(int[] data) { r& :v(
quickSort(data,0,data.length-1); yK_$d0ZGE~
} kmu7~&75
private void quickSort(int[] data,int i,int j){ 2mO9
int pivotIndex=(i+j)/2; '3E25BsL
//swap ?dCJv_w
SortUtil.swap(data,pivotIndex,j); wx2 z 9Q
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int k=partition(data,i-1,j,data[j]); X|R"8cJ
SortUtil.swap(data,k,j); m YhDi
if((k-i)>1) quickSort(data,i,k-1); %UV"@I+
if((j-k)>1) quickSort(data,k+1,j); )}i2x:\|_
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} lr
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/** =65XT^
* @param data WaE%g
* @param i `bd9N!K
* @param j i+I1h=
* @return VZ9`Kbu
*/ VQ+G.
private int partition(int[] data, int l, int r,int pivot) { b,(<74!#8
do{ 9.6ni1a'
while(data[++l] while((r!=0)&&data[--r]>pivot); )2:U]d%pk
SortUtil.swap(data,l,r); 6/Z_r0^O
} Scmew
while(l SortUtil.swap(data,l,r); /-=h|A#Kh
return l; V.ae 5@;
} K_qA[n
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} 8Qkwg]X
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改进后的快速排序: ydE}.0zN
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package org.rut.util.algorithm.support; #VZ
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import org.rut.util.algorithm.SortUtil; Jl$
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/** A 0;ng2&
* @author treeroot e_1L J
* @since 2006-2-2 w3ZOCWJS
* @version 1.0 5<7sVd.
*/ @ xTVX'$
public class ImprovedQuickSort implements SortUtil.Sort { ^r{N^
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private static int MAX_STACK_SIZE=4096; h+9~^<oFl
private static int THRESHOLD=10; _) UnHp_^
/* (non-Javadoc) un)PW&~E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Sa:;j4
*/ D\DwBZ>
public void sort(int[] data) { 5`::#[
int[] stack=new int[MAX_STACK_SIZE]; }=u#,nDl>$
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int top=-1; `?"r\Qo<
int pivot; 71\GK
int pivotIndex,l,r; $3eoZ1q'U-
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stack[++top]=0; c/Li,9cT'
stack[++top]=data.length-1; Zk31|dL
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