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快速排序: 0s2v'A[\
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package org.rut.util.algorithm.support; <yFu*(Q
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import org.rut.util.algorithm.SortUtil; `lt"[K<
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/** A=wh@"2
* @author treeroot ~O&:C{9=
* @since 2006-2-2 .=jay{
* @version 1.0 ?m?::R H
*/ V%
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public class QuickSort implements SortUtil.Sort{ = {wcfhUl+
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/* (non-Javadoc) <?4V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }d}Ke_Q0
*/ vTzlwK\#1
public void sort(int[] data) { ,>mrPtxN
quickSort(data,0,data.length-1); ^RtIh-Z.9
} b?QoS|<e?
private void quickSort(int[] data,int i,int j){ ` v@m-j6
int pivotIndex=(i+j)/2; ~AT'[(6
//swap Y#P%6Fy
SortUtil.swap(data,pivotIndex,j); @7j AL -
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int k=partition(data,i-1,j,data[j]); VZmLS 4E
SortUtil.swap(data,k,j); @'!SN\?W8
if((k-i)>1) quickSort(data,i,k-1); <T|3`#o0
if((j-k)>1) quickSort(data,k+1,j); l&Q`wR5e
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} 76h ,]xi
/** oEKvl3Hz_
* @param data 4
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* @param i #KexvP&*
* @param j orMwAV
* @return aH/
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*/ FSW_<%
private int partition(int[] data, int l, int r,int pivot) { X!dYdWw*m
do{ ;P%1j| 7
while(data[++l] while((r!=0)&&data[--r]>pivot); )"aV* "
SortUtil.swap(data,l,r); PKg@[<g43
} U6fgo3RH
while(l SortUtil.swap(data,l,r); R3&Iu=g
return l; 54R#W:t
} !_'ur>iR
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} *VhL\IjN]
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改进后的快速排序: LR.<&m%~.
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package org.rut.util.algorithm.support; /zVOK4BqN+
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import org.rut.util.algorithm.SortUtil; .jT#:_
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/** YvyNHW&
* @author treeroot Jgd'1'FOs
* @since 2006-2-2 ++Ts
* @version 1.0 V_}"+&W9
*/ ;dZZ;#k%
public class ImprovedQuickSort implements SortUtil.Sort { |AU~_{H
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private static int MAX_STACK_SIZE=4096; RF53J yt
private static int THRESHOLD=10; "2$fi{9
/* (non-Javadoc) ryUQU^v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Tc`=f'pP)4
*/ peuZ&yK+"
public void sort(int[] data) { 'UX!*5k<:
int[] stack=new int[MAX_STACK_SIZE]; [H^z-6x:0
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int top=-1; ;1O_M9
int pivot; tKx~1-
int pivotIndex,l,r; :L@?2),
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stack[++top]=0; n QZwC
stack[++top]=data.length-1; ,I(d6
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while(top>0){ `yXg{lk
int j=stack[top--]; }DfshZ0QM
int i=stack[top--]; e9 5Lo+:f
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pivotIndex=(i+j)/2; V0.vQ/
pivot=data[pivotIndex]; d#rf5<i
as4;:
SortUtil.swap(data,pivotIndex,j); dx{bB%?Y\=
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//partition (G4at2YLd
l=i-1; # 0Q]dO
r=j; hl (hJfp
do{ 1&evG-#<:
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Gm.T;fc:
SortUtil.swap(data,l,r); ujq=F
} 9gEwh<
while(l SortUtil.swap(data,l,r); ?;+1)> {
SortUtil.swap(data,l,j); )E@.!Ut4o
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if((l-i)>THRESHOLD){ z] PSpUd
stack[++top]=i; >j(_[z|v3
stack[++top]=l-1; E}Z/*lX
} BsqP?/
if((j-l)>THRESHOLD){ ,nLy4T&"
stack[++top]=l+1; q#ClnG*
stack[++top]=j; %D}kD6=
} |w1Bq
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} }`QUHIF
//new InsertSort().sort(data); JG!mc7
insertSort(data); `maKN \;
}
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/** R_ ,U Mt
* @param data Ug t.&IA
*/ K'Tm_"[u
private void insertSort(int[] data) { ," Wr"
int temp; Z/;(fL
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); H*&f: