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快速排序: ^i&/k
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package org.rut.util.algorithm.support; RW48>4f/+
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import org.rut.util.algorithm.SortUtil; )Ac8'{Tq/
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/** VXZd RsV8T
* @author treeroot HnUM:-6
* @since 2006-2-2 e'(n ^_$nl
* @version 1.0 kOETx
*/ >#*]/t
public class QuickSort implements SortUtil.Sort{ f'TjR#w
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/* (non-Javadoc) U# Y?'3 :
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?*K;+@EH
*/ f'\I52;FB
public void sort(int[] data) { ?+D_*'65D
quickSort(data,0,data.length-1); Run)E*sf
} 1sYwFr 5
private void quickSort(int[] data,int i,int j){ HB {w:
int pivotIndex=(i+j)/2; ,f0cy\.?
//swap \K`AO{ D@
SortUtil.swap(data,pivotIndex,j); p*_g0_^
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int k=partition(data,i-1,j,data[j]); MG[?C2KA/
SortUtil.swap(data,k,j); z
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if((k-i)>1) quickSort(data,i,k-1); B{H;3{0
if((j-k)>1) quickSort(data,k+1,j); Df||#u=n
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} [{6]i J
/** \r^=W=
* @param data Sq %BfP)a(
* @param i 35) ]R`f
* @param j &qz&@!`
* @return ?{\8!_Gvsl
*/ k<ku5U1|
private int partition(int[] data, int l, int r,int pivot) { s!nFc{
do{ /$\yAOA'y
while(data[++l] while((r!=0)&&data[--r]>pivot); g?A4C`l6iy
SortUtil.swap(data,l,r); J*U,kyYF
} j7<`^OG
while(l SortUtil.swap(data,l,r); :35J<oG
return l; .^I,C!O#
} u]@``Zb|
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} ^USj9HTK
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改进后的快速排序: vlw2dY@^
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package org.rut.util.algorithm.support; |iLeOztuE
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import org.rut.util.algorithm.SortUtil; ~bL(mq
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/** Bqv Oi~l
* @author treeroot )_NQ*m
* @since 2006-2-2 FgE6j;
* @version 1.0 D*Siy;
*/ r&A#h;EQX2
public class ImprovedQuickSort implements SortUtil.Sort { 3lMmSKN
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private static int MAX_STACK_SIZE=4096; 3*CF !Y%
private static int THRESHOLD=10; <\8dh(>
/* (non-Javadoc) =:P9 $
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @Rig@
*/
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public void sort(int[] data) { Cj"k
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int[] stack=new int[MAX_STACK_SIZE]; #AyM!
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int top=-1; SY`NZJK
int pivot; SgAY/#
int pivotIndex,l,r; 92]>"
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stack[++top]=0; zc'!a"
stack[++top]=data.length-1; )+RGXVp
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while(top>0){ Q
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int j=stack[top--]; Z7JI4"
int i=stack[top--]; +NxEx/{
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pivotIndex=(i+j)/2; (nbqL+
pivot=data[pivotIndex]; 6NZ3(
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SortUtil.swap(data,pivotIndex,j); $bF.6
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//partition pJ6bX4QnDX
l=i-1; ,'= Y
r=j; sw' 20I
do{ |bi"J;y
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 09_3`K.*
SortUtil.swap(data,l,r); UB|Nx(V s
} y,DK@X
while(l SortUtil.swap(data,l,r); @+syD
SortUtil.swap(data,l,j); j()_
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if((l-i)>THRESHOLD){ YMIDV-
stack[++top]=i; _;yp^^S
stack[++top]=l-1; m qPWCFP
} 7{D+\i
if((j-l)>THRESHOLD){ o83HR[
stack[++top]=l+1; ym2\o_^(
stack[++top]=j; -qs.'o
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} /cJ$`
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} NJz8ANpro$
//new InsertSort().sort(data); jsf=S{^2
insertSort(data); Z]1~9:7ap
} YCeE?S1gk3
/** ZJP.-` U
* @param data A_{QY&%m
*/ gA2Il8K
private void insertSort(int[] data) { .7g^w+W
int temp; NjdAfgA
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); -J:](p
} @H@&B`K d
} e3F)FTG&
} #fG!dD42
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} .m7iXd{
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