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快速排序: orJN#0v4
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package org.rut.util.algorithm.support; +dlN^P647
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import org.rut.util.algorithm.SortUtil; BjSLbw-C
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/** PyK)ks!6
* @author treeroot >Ka}v:E
* @since 2006-2-2 u1rT:\G1
* @version 1.0 y4+Km*am,W
*/ Oo$i,|$$
public class QuickSort implements SortUtil.Sort{ usU5q>1
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/* (non-Javadoc) ttgb"Wb%S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]e!9{\X,*
*/ Y'0H2B8
public void sort(int[] data) { dxsPX=\:
quickSort(data,0,data.length-1); |%Pd*yZA
} CnN PziB
private void quickSort(int[] data,int i,int j){
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int pivotIndex=(i+j)/2; `C$.
//swap !2=<MO
SortUtil.swap(data,pivotIndex,j); z`XX[9$qm
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int k=partition(data,i-1,j,data[j]); 2{(_{9<>z
SortUtil.swap(data,k,j); ]U82A**n
if((k-i)>1) quickSort(data,i,k-1); wMr*D['" #
if((j-k)>1) quickSort(data,k+1,j); ve<D[jQsk
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} :A"GOc,
/** 4;=+qb
* @param data ]sB-}n)
* @param i |bDUekjR
* @param j E{*d`n
* @return 3,t3\`=
*/ Q3T@=z2j%
private int partition(int[] data, int l, int r,int pivot) { e-Mei7{%
do{ ^-Bx zOp
while(data[++l] while((r!=0)&&data[--r]>pivot); =)!sWY:
SortUtil.swap(data,l,r); p%[/
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} l]C#bL>i
while(l SortUtil.swap(data,l,r); P 9c!
return l; br`cxgZ0"
} ?NWc3 .
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} d0YDNP%,_
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改进后的快速排序: lk;4l Z
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package org.rut.util.algorithm.support; @Jr:+|v3B
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import org.rut.util.algorithm.SortUtil; +VT/c
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/** =#0f4z
* @author treeroot F=EG#<@u
* @since 2006-2-2 juIi-*R!
* @version 1.0 OXp(rJ*bK
*/ #q?'<''d,
public class ImprovedQuickSort implements SortUtil.Sort { bf@H(gCW=
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private static int MAX_STACK_SIZE=4096; 0 7b=Zhh
private static int THRESHOLD=10; "RcNy~
/* (non-Javadoc) i24t$7q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) eCFMWFhC
*/ maTQ0GX
public void sort(int[] data) { 4 ))Z Bq?
int[] stack=new int[MAX_STACK_SIZE]; A*^aBWFR
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int top=-1; 4 '"C8vw.
int pivot; (P'{A>aHl0
int pivotIndex,l,r; Ui|z#{8&
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stack[++top]=0; A1g.ww:
stack[++top]=data.length-1; Nk2n&(~$
[] cF*en
while(top>0){ _3%eIyk4T
int j=stack[top--]; uHeKttR-
int i=stack[top--]; SFJ"(ey$
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pivotIndex=(i+j)/2; AdD,94/
pivot=data[pivotIndex]; J~}sQ{ 0
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SortUtil.swap(data,pivotIndex,j); z>]P_E~`}
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//partition y~Z7sx0
l=i-1; ghU~H4[x D
r=j; y7^E`LKK
do{ {f"oqry_g
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ~)CGwST[
SortUtil.swap(data,l,r); qf
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} WF] |-)vw
while(l SortUtil.swap(data,l,r); ghGpi U$
SortUtil.swap(data,l,j); V9Pw\K!w#\
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if((l-i)>THRESHOLD){ g286
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stack[++top]=i; `:.a5
stack[++top]=l-1; t#d{hEr
} 8Wba Hw_
if((j-l)>THRESHOLD){ Uz=OTM
stack[++top]=l+1; \r1nMw 3&
stack[++top]=j; PCx:
} ;W{2\ Es
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} #(7^V y&
//new InsertSort().sort(data); 'pj*6t1~
insertSort(data); >t#5eT`_ w
} d k/f_m
/** F1*xY%Jv^M
* @param data ^ 6b27_=
*/ +\-cf,WkI
private void insertSort(int[] data) { :'2h0
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int temp; R =kXf/y
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1);
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} # Rhtaq9
} x7GYWK
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} ]w0_!Z&
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} Gv&%cq1
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