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快速排序: LpYG!K l
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package org.rut.util.algorithm.support; [(rT,31cW
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import org.rut.util.algorithm.SortUtil; ?bH&F
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/** M(/ATOJ(
* @author treeroot W2Ik!wEe&
* @since 2006-2-2 xk*&zAt
* @version 1.0 S
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*/ QHDR*tB:{
public class QuickSort implements SortUtil.Sort{ ]T:a&DHC
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/* (non-Javadoc) _@5|r|P>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vk0b b3){D
*/ |ns
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public void sort(int[] data) { ,`
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quickSort(data,0,data.length-1); T@%\?=P
} ?yc{@|
private void quickSort(int[] data,int i,int j){ S 6CI+W
int pivotIndex=(i+j)/2; -^aJ}[uaI
//swap [o"<DP6w
SortUtil.swap(data,pivotIndex,j); ?:$\
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int k=partition(data,i-1,j,data[j]); i$5<>\g
SortUtil.swap(data,k,j); OU
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if((k-i)>1) quickSort(data,i,k-1); { MV,>T_
if((j-k)>1) quickSort(data,k+1,j); ?Qxf~,F
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} HSk_'g(\0
/** x fa-
* @param data ?Gl]O3@3
* @param i "qrde4O
* @param j S"4eS,5L|
* @return @xXVJWEU:
*/ nZ'-3
private int partition(int[] data, int l, int r,int pivot) { ?XbM
do{ =%ok:+D]
while(data[++l] while((r!=0)&&data[--r]>pivot); y1)ZO_'
SortUtil.swap(data,l,r); @PT([1C
} ZuFcJ?8i
while(l SortUtil.swap(data,l,r); Vak\N)=u
return l; 8<)ZpB,7
} hYht8?6}m
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改进后的快速排序: xG(xG%J
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package org.rut.util.algorithm.support; D3B]
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import org.rut.util.algorithm.SortUtil; ?g9:xgkF
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/** jsFfrS"*
* @author treeroot jF}-dfe
* @since 2006-2-2 L^jjf8_
* @version 1.0 "Ccyj /
*/ 16ZyLt
public class ImprovedQuickSort implements SortUtil.Sort { `Gj(>z*
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private static int MAX_STACK_SIZE=4096; lrAhdi
private static int THRESHOLD=10; -VeCX]
/* (non-Javadoc) xg}Q~,:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bksv2@ar
*/ ?I[*{}@n"
public void sort(int[] data) { :
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int[] stack=new int[MAX_STACK_SIZE]; Sv_Nb >
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int top=-1; W,|+Dl
int pivot; -.Blj<2ah
int pivotIndex,l,r; _%[po%]
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stack[++top]=0; mqj-/DN6*
stack[++top]=data.length-1; ~Pj q3etk
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while(top>0){ %.m+6
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int j=stack[top--]; Ptc+ypTu
int i=stack[top--]; -&COI-P8
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pivotIndex=(i+j)/2; W=#AfPi$&
pivot=data[pivotIndex]; }v's>Ae~p
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SortUtil.swap(data,pivotIndex,j); 1uO2I&B
#R>x]Nt}
//partition R_O=WmD
l=i-1; jsQHg2Vd
r=j; f S[-K?K
do{ &s(J:P$!
while(data[++l] while((r!=0)&&(data[--r]>pivot)); =W &Mt
SortUtil.swap(data,l,r); V2!0),]B
} !~&&&85
while(l SortUtil.swap(data,l,r); xeL"FzF:V
SortUtil.swap(data,l,j); S=0DQ19
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if((l-i)>THRESHOLD){ lLp,sNAj
stack[++top]=i; >.6|\{*sG
stack[++top]=l-1; f~F{@),acZ
} _1NK9dp:
if((j-l)>THRESHOLD){ 'zM=[#!B
stack[++top]=l+1; LFI#wGhXVk
stack[++top]=j; l>MDCqV
} +J|H~`
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} @)BO`;*$fF
//new InsertSort().sort(data); WR3,woo
insertSort(data); `sCn4-$8
} ,sIC=V +
/** #1/~eIEY
* @param data F#>00b{Q
*/ {vGJ}q?Sd"
private void insertSort(int[] data) { +U1
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int temp; a%e`
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); hbOXR.0z
} Z4EmRa30 p
} w`;HwK$ ,
} fz\Q>u'T
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} }b1FB<e]
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