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快速排序: 1M@OBfB8
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package org.rut.util.algorithm.support; FTu6%~M/
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import org.rut.util.algorithm.SortUtil; >}~\*Y\8@
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/** b$@vJ7V!
* @author treeroot /wAx#[c[
* @since 2006-2-2 Nk
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* @version 1.0 9t$#!2z
*/ P}"=67$
public class QuickSort implements SortUtil.Sort{ hSAdD!
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/* (non-Javadoc) srS2v\1:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rF@njw@
*/ /;5U-<qf
public void sort(int[] data) { y5@#leM
quickSort(data,0,data.length-1); \NZ(Xk
} 6=pE5UfT
private void quickSort(int[] data,int i,int j){ Fw{:fFZC[
int pivotIndex=(i+j)/2; h@kq>no
//swap WZ@hP'Zc
SortUtil.swap(data,pivotIndex,j); I1f4u6\*X
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int k=partition(data,i-1,j,data[j]); ,5*Z<[*
SortUtil.swap(data,k,j); )wZ;}O
if((k-i)>1) quickSort(data,i,k-1); L<D<3g|4
if((j-k)>1) quickSort(data,k+1,j); "FD`1
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} =Ff _)k
/** 1>yh`Bp\=
* @param data zG\& ZU
* @param i bwR$910b
* @param j 7];AB;0"
* @return 8n&Gn%DvX
*/ !l6Ez_'
private int partition(int[] data, int l, int r,int pivot) { W(4Mvd
do{ y
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while(data[++l] while((r!=0)&&data[--r]>pivot); k2 _i;v
SortUtil.swap(data,l,r); cePe0\\
} 6
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while(l SortUtil.swap(data,l,r); oMNt676
return l; !k3 eUBF
} cy-o@U"s8
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} 02$d
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改进后的快速排序: I%|,KWM
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package org.rut.util.algorithm.support; `{KdmWhW
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import org.rut.util.algorithm.SortUtil; &xWej2a!
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/** G+~f
* @author treeroot tFEY8ut{
* @since 2006-2-2 OH
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* @version 1.0 Iwx~kvz\_(
*/ wo+b":
public class ImprovedQuickSort implements SortUtil.Sort { F G:t2ea
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private static int MAX_STACK_SIZE=4096; mOC<a7#
private static int THRESHOLD=10; (- D^_*f
/* (non-Javadoc) F$sDmk#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +^<s'
*/ H:#sf][&,L
public void sort(int[] data) { !kxJ&VmeF
int[] stack=new int[MAX_STACK_SIZE]; P @Jo[J<
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int top=-1; 0SV<Pl^
int pivot; eF"k"Ckt'
int pivotIndex,l,r; Yi?v|H<a
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stack[++top]=0; 9,?7mgZp
stack[++top]=data.length-1; un F=";9H
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while(top>0){ Z35(f0b
int j=stack[top--]; yE#.Q<4
int i=stack[top--]; EJW}&e/
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pivotIndex=(i+j)/2; >Jk]=_%
pivot=data[pivotIndex]; ^O3i)GO
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SortUtil.swap(data,pivotIndex,j); GYt|[GC
)61X,z
//partition / q| o
l=i-1; *B)J(^M!q
r=j; $'x#rW>v
do{ Fhrj$
while(data[++l] while((r!=0)&&(data[--r]>pivot)); %a:>3!
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SortUtil.swap(data,l,r); hHk9O?
} $KVCEe!X
while(l SortUtil.swap(data,l,r); `%/w0,0
SortUtil.swap(data,l,j); :w<Ga8\tZ
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if((l-i)>THRESHOLD){ R=J5L36F
stack[++top]=i; P:>]a$Is
stack[++top]=l-1; 5S*aZ1t18
} 5m
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if((j-l)>THRESHOLD){ MW2{w<-]7
stack[++top]=l+1; r>ag(^J\
stack[++top]=j; =[:pm)
} udOdXz6K?
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} P~*'/!@
//new InsertSort().sort(data); a$5P\_
insertSort(data); ?J@P0(M#
} 7Ucq(,\./
/** &Nw[J5-"k
* @param data gtnu/Q
*/ (DkfLadB
private void insertSort(int[] data) { hkB|rhJgm
int temp; `^HK-t4q
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ]1 jhy2j
} \4KV9wm
} mndKUI}d
} CB0p2WS_
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} qg2Vmj<H
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