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快速排序: HfZ ^ED"}
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package org.rut.util.algorithm.support; 0SfW:3
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import org.rut.util.algorithm.SortUtil; QChncIqc
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/** j]FK.G'
* @author treeroot qu1+.z=|
* @since 2006-2-2 (dZ]j){
* @version 1.0 RIQ-mpg~(k
*/ )X;051Q
public class QuickSort implements SortUtil.Sort{ Y)@Y$_
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/* (non-Javadoc) RC}m]!Uz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6DU~6c=)
*/ U?an\rv
public void sort(int[] data) { IU<lF) PF$
quickSort(data,0,data.length-1); ,{mv6?_
} x3g4 r_
private void quickSort(int[] data,int i,int j){ D2g/P8.<A
int pivotIndex=(i+j)/2; c7~R0nP
//swap ~4pP(
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SortUtil.swap(data,pivotIndex,j); S)g:+P
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int k=partition(data,i-1,j,data[j]); ,jEc4ih4
SortUtil.swap(data,k,j); 9/!1J
if((k-i)>1) quickSort(data,i,k-1); AT)b/ycC
if((j-k)>1) quickSort(data,k+1,j); cF4,dnI
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} x!fG%o~h
/** j g//I<D
* @param data Q^ZM| (s#
* @param i 5RvE ),
* @param j 63 'X#S
* @return %YK xdp
*/ 5[g\.yi2_]
private int partition(int[] data, int l, int r,int pivot) { 6_<~]W&
do{ 76"4Q!
while(data[++l] while((r!=0)&&data[--r]>pivot); 0
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SortUtil.swap(data,l,r); q\}+]|nGs
} d|oO2yzWv
while(l SortUtil.swap(data,l,r); )l$}plT4
return l; T\n6^@.>
} ~uH_y-
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} /q+;!EM
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改进后的快速排序: (ix.
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package org.rut.util.algorithm.support; Yb-{+H8{J
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import org.rut.util.algorithm.SortUtil; }^iqhUvT F
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/** ;:j1FOj
* @author treeroot v+"4YIN
* @since 2006-2-2 BO#tn{(#
* @version 1.0 R2n
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*/ *
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public class ImprovedQuickSort implements SortUtil.Sort { MW6z&+Z
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private static int MAX_STACK_SIZE=4096; 3ZI7;Gw
private static int THRESHOLD=10; Hc=QSP
/* (non-Javadoc) 9M;t4Um
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ) jH`lY) 1
*/ E0R6qS:'
public void sort(int[] data) { *s*Y uY%y
int[] stack=new int[MAX_STACK_SIZE]; _<LL@IX
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int top=-1; &G\mcstX
int pivot; 3q}j"x?
int pivotIndex,l,r; 5gtf`ebs/
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stack[++top]=0; iW^J>aKy
stack[++top]=data.length-1; nV7Vc;
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while(top>0){ gr*CN<
int j=stack[top--]; '"fJA/O
int i=stack[top--]; ?' .AeoE-
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pivotIndex=(i+j)/2; 1'\QD`M9^
pivot=data[pivotIndex]; H:]cBk^[,
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SortUtil.swap(data,pivotIndex,j); 1*9.K'
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//partition ,JE_aje7
l=i-1; 8rH6L:]S
r=j; VwE4:/7YN
do{ Z;Hkx1
while(data[++l] while((r!=0)&&(data[--r]>pivot)); GeTk/tU
SortUtil.swap(data,l,r); M&j|5UH%.
} )^ Y+Vn
while(l SortUtil.swap(data,l,r); B6Kl_~gT
SortUtil.swap(data,l,j); (tX3?[ii
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if((l-i)>THRESHOLD){ nf/?7~3?[
stack[++top]=i;
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stack[++top]=l-1; ^
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} WHY/x /$
if((j-l)>THRESHOLD){ X`KSj
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stack[++top]=l+1; o=3hWbe
stack[++top]=j; ={)85N
} ^obuMQ;
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} b<00 %Z
//new InsertSort().sort(data); D#b*M)X"
insertSort(data); z}ar$}T
} k0e}`#t
/** 8u+kA
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* @param data e4tIO
*/ ki9&AFs2X
private void insertSort(int[] data) { $]We |
int temp; +:.Jl:fx4
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); }_]AQN$'G
} </{Zb.
} P9bM+@5e
} yV!4Im.>
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} iPTQqx-m$7
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