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快速排序: [ADSGnw
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package org.rut.util.algorithm.support; aNt+;M7g`
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import org.rut.util.algorithm.SortUtil; cj[a^ ZH
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/** !O*'mX
* @author treeroot iX&eQ{LB
* @since 2006-2-2 %-nYK3
* @version 1.0 X
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*/ J\@ r~x5G
public class QuickSort implements SortUtil.Sort{ , 0hk)Vvr3
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/* (non-Javadoc) xX !`0T7Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) z_i(o
*/ |\}&mBR
public void sort(int[] data) { w"PnN
quickSort(data,0,data.length-1); f6of8BOg
} ~nP~6Q'wSH
private void quickSort(int[] data,int i,int j){ @PQ%
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int pivotIndex=(i+j)/2; l+ ,p=
//swap Ux/|D_rlf
SortUtil.swap(data,pivotIndex,j); z`Jcpt
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int k=partition(data,i-1,j,data[j]); @~=*W5
SortUtil.swap(data,k,j); .8GX8[t
if((k-i)>1) quickSort(data,i,k-1); :eH*biXy}2
if((j-k)>1) quickSort(data,k+1,j); }]<Ghns
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} QLPb5{>KDS
/** iH`Q4
* @param data ~vb yX
* @param i 9 HiH6f^5
* @param j {+3
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* @return h]+UK14m
*/ -$ VP#%
private int partition(int[] data, int l, int r,int pivot) { Y:?cWO
do{ K]{x0A
while(data[++l] while((r!=0)&&data[--r]>pivot); @%^JB
SortUtil.swap(data,l,r); +nIjW;RU
} < NRnE8:
while(l SortUtil.swap(data,l,r); iJ&jg`"=F
return l; p{vGc-zP.
} =,Zkg(M
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} X7~^D[X
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改进后的快速排序: 4@mK:v%
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package org.rut.util.algorithm.support; FUO 9jX
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import org.rut.util.algorithm.SortUtil; L-9AJk>V
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/** tH)fu%:p
* @author treeroot <G_71J`MLC
* @since 2006-2-2 Pf:;iXH?
* @version 1.0 w paI}H#
*/ 6 uTFgSqZ
public class ImprovedQuickSort implements SortUtil.Sort { mB5Sm|{
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private static int MAX_STACK_SIZE=4096; 5%jy7)8C
private static int THRESHOLD=10; &} rmDx
/* (non-Javadoc) Z}AhDIw!G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rJM/.;Ag
*/ b|DiU}
public void sort(int[] data) { v,L@nlD]
int[] stack=new int[MAX_STACK_SIZE]; t?(fDWd|-
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int top=-1; )Tl]1^
int pivot; 9*2Q'z}_
int pivotIndex,l,r; =T- jG_.H
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stack[++top]=0; V q[4RAd^P
stack[++top]=data.length-1; 2PC:F9dh\
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while(top>0){ UrmnHc>}c
int j=stack[top--]; S8,e`F
int i=stack[top--]; pSl4^$2XR
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pivotIndex=(i+j)/2; _u9bZ'
pivot=data[pivotIndex]; rU
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SortUtil.swap(data,pivotIndex,j); "!9FJ Y
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//partition 0O!A8FA0
l=i-1; =.]{OT
r=j; | Kq<}R
do{ aT~=<rEDy
while(data[++l] while((r!=0)&&(data[--r]>pivot)); w+Y_TJ%
SortUtil.swap(data,l,r); dAr=X4LE
} {
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while(l SortUtil.swap(data,l,r); H1d2WNr[
SortUtil.swap(data,l,j); *AG01# ZF
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if((l-i)>THRESHOLD){ C({r1l4[D
stack[++top]=i; hEA;5-m
stack[++top]=l-1; .3CQFbHF
} `$Y%c1;
if((j-l)>THRESHOLD){
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stack[++top]=l+1; Rr0]~2R
stack[++top]=j; O&
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} oi7Y?hTj
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} +62}//_?
//new InsertSort().sort(data); _/NPXDL
insertSort(data); c{3P|O&.
} 9hei8L:
/** Ov;q]Vn>
* @param data "9#hk3*GqX
*/ J6mUU3F9f
private void insertSort(int[] data) { HBm(l@#.
int temp; 2Mu3]2>
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); { ^Rr:+
} %x8vvcO^t
} >-j([%
} XG!^[ZDs
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} [M2xF<r6t
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