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快速排序: /cen#pb
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package org.rut.util.algorithm.support; RZh)0S>J
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import org.rut.util.algorithm.SortUtil; w]-iM
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/** xy3%z
* @author treeroot de47O
* @since 2006-2-2 Hf{%N'4
* @version 1.0 [IBk-opap
*/ KL"L65g&
public class QuickSort implements SortUtil.Sort{
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/* (non-Javadoc) V"jnrNs3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s'Q^1oQM2h
*/ l'%R^
public void sort(int[] data) { z ;Nk& <?
quickSort(data,0,data.length-1); '0$[Ujc
} {1DYXKe
private void quickSort(int[] data,int i,int j){ W*`6ero
int pivotIndex=(i+j)/2; aB!Am +g
//swap ~WXxVm*@
SortUtil.swap(data,pivotIndex,j); }V;]c~Q/H
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int k=partition(data,i-1,j,data[j]); slfVQ809
SortUtil.swap(data,k,j); *Y0,d`
if((k-i)>1) quickSort(data,i,k-1); nnl9I4-O
if((j-k)>1) quickSort(data,k+1,j); O~'yP@&`
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} $QBUnLOek&
/** z35Rjhj9
* @param data $-fY 8V3[
* @param i \U>Kn_7m
* @param j E"&9FxS]^
* @return jUSr t)o03
*/ 8~#Q *
private int partition(int[] data, int l, int r,int pivot) { mxA )r5sx
do{ <XrGr5=BV
while(data[++l] while((r!=0)&&data[--r]>pivot); Wj=ex3K3u.
SortUtil.swap(data,l,r); + qqN
} #e>MNc
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while(l SortUtil.swap(data,l,r); M?zAkHNS$
return l; {=7i}xY]T
} Bt3=/<.\
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} JHH&@Cn
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改进后的快速排序: f.^w/ GJO/
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package org.rut.util.algorithm.support; tgA
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import org.rut.util.algorithm.SortUtil; S9oGf
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/** S`w)b'B!M
* @author treeroot _ u2
* @since 2006-2-2 S]/+n>
* @version 1.0 C~V$G}mM
*/ a`Zf_;$@
public class ImprovedQuickSort implements SortUtil.Sort { toJ&$HrE
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private static int MAX_STACK_SIZE=4096; [`\Qte%UH
private static int THRESHOLD=10; 'FFc"lqj
/* (non-Javadoc) <t37DnCgI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) In
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*/ n$l]+[>
public void sort(int[] data) { n5>N9lc
int[] stack=new int[MAX_STACK_SIZE]; TJ:Lz]l >
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int top=-1; |h/2'zd^-
int pivot; ,0~TvJS
int pivotIndex,l,r; $7d"9s\$"
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stack[++top]=0; p
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stack[++top]=data.length-1; ,m]q+7E
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while(top>0){ #?6RoFgMe
int j=stack[top--]; ? d\8Q't*
int i=stack[top--]; {2@96o2}
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pivotIndex=(i+j)/2; q:.BY}X9
pivot=data[pivotIndex]; dxWw%_Q
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SortUtil.swap(data,pivotIndex,j); `,d7_#9'
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//partition !F)oX7"
l=i-1; ;D:T
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r=j; }*.*{I
do{ _AYF'o-Cm
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 'DQyB`V2y
SortUtil.swap(data,l,r); PM7/fv*,
} 9 To6Rc;
while(l SortUtil.swap(data,l,r); "QS7?=>*F
SortUtil.swap(data,l,j); ||aU>Wj4
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if((l-i)>THRESHOLD){ 9lV'3UG-?
stack[++top]=i; 4PQWdPv;
stack[++top]=l-1; 7!%"8Rl-
} f
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if((j-l)>THRESHOLD){ "g-NUl`'
stack[++top]=l+1; !&[4T#c
stack[++top]=j; X2v'9 x
} z?,5v`,t2
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} ? Q}{&J
//new InsertSort().sort(data); VIzZmd
insertSort(data); q?&&:.H"?5
} rI/KrBM
/** YyIt-fPZ
* @param data %>TdTt
*/ `l#g`~L
private void insertSort(int[] data) { 5Y^YKV{
int temp; )3sb2
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); mN02T@R-
} za7wNe(s
} _wCSL.
} W6Pg:Il7
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} bAp`lmFI
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