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快速排序: B>Tfyo
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package org.rut.util.algorithm.support; O=~8+sa
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import org.rut.util.algorithm.SortUtil; s~
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/** me:~q#k
* @author treeroot Q&+Jeji
* @since 2006-2-2 F*m^AFjs
* @version 1.0 a~q_2S]h
*/ nGQc;p5;
public class QuickSort implements SortUtil.Sort{ 8,B?!%FP
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/* (non-Javadoc) YXz*B5R
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M8dv
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*/ <Hd8Jd4f
public void sort(int[] data) { vUm#^/#I
quickSort(data,0,data.length-1); 'D`O4TsP>
} 8X Jg
private void quickSort(int[] data,int i,int j){ ).U\,@[A{
int pivotIndex=(i+j)/2; ^j]"!:h
//swap mN^w?R41m
SortUtil.swap(data,pivotIndex,j); jz,Mm,Gi
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int k=partition(data,i-1,j,data[j]); ,;;7+|`
SortUtil.swap(data,k,j); NwAvxN<R(f
if((k-i)>1) quickSort(data,i,k-1); qE B3Y54+
if((j-k)>1) quickSort(data,k+1,j); @Wgd(Ezd
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} er@"4R0
/** ?QA![
* @param data W*J_PL9j
* @param i PLD&/SgP*
* @param j kw)("SQ
* @return krqz;q-p~
*/ S!+c1q:
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private int partition(int[] data, int l, int r,int pivot) { `+DH@ce
do{ h?_Cv*0q
while(data[++l] while((r!=0)&&data[--r]>pivot); `HVS}}{a
SortUtil.swap(data,l,r); J]&^A$
} "/e_[_j
while(l SortUtil.swap(data,l,r); (LiS9|J!
return l; :ohGG ,`Dh
} d}D%%noIu
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改进后的快速排序: TF]bmM})0
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package org.rut.util.algorithm.support; l5h+:^#M5c
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import org.rut.util.algorithm.SortUtil; /x%h@Cn!
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/** /q|r!+
* @author treeroot gB7kb$J
* @since 2006-2-2 BF^dNgn+%K
* @version 1.0 MzEeDN
*/ YnR8mVo5Q
public class ImprovedQuickSort implements SortUtil.Sort { UY>[
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private static int MAX_STACK_SIZE=4096; 4X-" yQ<U
private static int THRESHOLD=10; CdBpz/
/* (non-Javadoc) Vz.G!*>Dg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _V2^0CZ
*/ ak,KHA6u
public void sort(int[] data) { %x'}aTa
int[] stack=new int[MAX_STACK_SIZE]; m:}PVJ-"
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int top=-1; mM9a T0_w
int pivot; \;XDPC j
int pivotIndex,l,r; VSx9aVPkC
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stack[++top]=0; yv[3&E?
stack[++top]=data.length-1; '/OcJVSR
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while(top>0){ rn$G.SMgz
int j=stack[top--]; y^!>'cdV
int i=stack[top--]; _0cCTQE
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pivotIndex=(i+j)/2; O2pntKI
pivot=data[pivotIndex]; "D\>oFu
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SortUtil.swap(data,pivotIndex,j); 1d$qr`
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//partition ol0i^d*9F
l=i-1; ^ps6\>=0cW
r=j; @4t_cxmD
do{ 7vo8lnQ{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 4,,DA2^!
SortUtil.swap(data,l,r); %p48=|+
} _sb~eB~<(
while(l SortUtil.swap(data,l,r); i:a*6b.U@N
SortUtil.swap(data,l,j); zif&