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快速排序:
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package org.rut.util.algorithm.support; {0! ~C=P
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import org.rut.util.algorithm.SortUtil; =AVgIv
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/** a[lY S{
* @author treeroot x8;`i$
* @since 2006-2-2 '0$?h9"
* @version 1.0 b3wM;jv
*/ {JV@"t-X3"
public class QuickSort implements SortUtil.Sort{ "EU{8b
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/* (non-Javadoc) >NB?&|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %4\OPw&
*/ H:p Z-v*
public void sort(int[] data) { fYE(n8W3
quickSort(data,0,data.length-1); /6O??6g
} +GsWTEz
private void quickSort(int[] data,int i,int j){ jGrN\D?h
int pivotIndex=(i+j)/2; RzhWD^b B
//swap @"T"7c?Cv
SortUtil.swap(data,pivotIndex,j); i(?,6)9
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int k=partition(data,i-1,j,data[j]); +n}$pM|NKU
SortUtil.swap(data,k,j); PSawMPw
if((k-i)>1) quickSort(data,i,k-1); y*{Zbz#{
if((j-k)>1) quickSort(data,k+1,j); Rl|4S[
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} s4_/&h
/** ?PTk1sB
* @param data p!Eft/A(
* @param i vzF5xp.
* @param j smG>sEp2
* @return ;,&8QcSVY
*/ &[2U$ `P`V
private int partition(int[] data, int l, int r,int pivot) { +.y
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do{ uP\lCqK,
while(data[++l] while((r!=0)&&data[--r]>pivot); iqnJ~g
SortUtil.swap(data,l,r); T]Nu)
} %!ebO*8q
while(l SortUtil.swap(data,l,r); b|SE<\
return l; K
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} &rDM<pO #-
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} LJX-AO.4
)} DUMq7
改进后的快速排序: g+-;J+X8
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package org.rut.util.algorithm.support; Vtppuu$
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import org.rut.util.algorithm.SortUtil; t6c<kIQ:-O
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/** Nr2 C@FU:0
* @author treeroot RFh"&0[
* @since 2006-2-2 zo;^m|
* @version 1.0 J8y0d1SG
*/ \,!QJp4
public class ImprovedQuickSort implements SortUtil.Sort { C@N1ljXJT
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private static int MAX_STACK_SIZE=4096; e6=]m#O9
private static int THRESHOLD=10; ]*O/+
/* (non-Javadoc) ]CU]pK?nq
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ >h Y"
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public void sort(int[] data) { |}){}or
int[] stack=new int[MAX_STACK_SIZE]; 6io , uh!
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int top=-1; nS()u}c;r
int pivot; QrApxiw
int pivotIndex,l,r; zF4 [}*
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stack[++top]=0; `P Xz
stack[++top]=data.length-1; wOB azWa
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while(top>0){ (I@bkMp
int j=stack[top--]; E^w:KC2@
int i=stack[top--]; ZxGP/D
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pivotIndex=(i+j)/2; uH3D{4
pivot=data[pivotIndex]; D+lzFn$3
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SortUtil.swap(data,pivotIndex,j); 3Q/#T1@
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//partition $-+/$!
l=i-1; ~-a'v!
r=j; MH|]\
do{ #6Xs.*b5C
while(data[++l] while((r!=0)&&(data[--r]>pivot)); P7B:%HiAx
SortUtil.swap(data,l,r); >-E<