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快速排序: f* p=]]y
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package org.rut.util.algorithm.support; `:R8~>p
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import org.rut.util.algorithm.SortUtil; AdKv!Ta5b
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/** xpRQ"6
* @author treeroot gM^ Hs7o,
* @since 2006-2-2 Aum&U){yY
* @version 1.0 Kw"7M~
*/ BQ2DQ7q
public class QuickSort implements SortUtil.Sort{ -jFvDf,M,D
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/* (non-Javadoc) |r%6;8A]i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) cQA;Y!Q#
*/ k`'^e/
public void sort(int[] data) { .ie \3q)
quickSort(data,0,data.length-1); '\[GquK;P
} `G@]\)-!
private void quickSort(int[] data,int i,int j){ WVir[Kv%
int pivotIndex=(i+j)/2; 4$@5PS#,
//swap 118A6qyi
SortUtil.swap(data,pivotIndex,j); rB<
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int k=partition(data,i-1,j,data[j]); |z-A;uL <
SortUtil.swap(data,k,j); v0apEjT
if((k-i)>1) quickSort(data,i,k-1); &3:-(:<U
if((j-k)>1) quickSort(data,k+1,j); '>@evrG
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} 3.xsCcmP
/** :-69,e
* @param data 9]xOuCb
* @param i /MosE,7l
* @param j k-*H=km
* @return L|u\3.:
*/ Kj;Q;Ii
private int partition(int[] data, int l, int r,int pivot) { ;SagN
do{ |Q@4F&k
while(data[++l] while((r!=0)&&data[--r]>pivot); Nw/4z$].J
SortUtil.swap(data,l,r); =NQDxt}
} @9~6+BZOq
while(l SortUtil.swap(data,l,r); g-bHf]'
return l; F$^RM3
} es6!p 7p?
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} a[1^)=/DM
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改进后的快速排序: >h(n8wTP
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package org.rut.util.algorithm.support; bLhTgss](
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import org.rut.util.algorithm.SortUtil; b>er 'U
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/** xVfAlN37(
* @author treeroot )R(kXz=M
* @since 2006-2-2 RpOGY{[)[
* @version 1.0 cGIxE[n'
*/ @4#q
public class ImprovedQuickSort implements SortUtil.Sort { J NPEyC
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private static int MAX_STACK_SIZE=4096; wa\Yc,R
private static int THRESHOLD=10; #.'0DWT\-
/* (non-Javadoc) wDVKp['
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %iPWg
*/ 'JU(2mF
public void sort(int[] data) { KLBU8%
int[] stack=new int[MAX_STACK_SIZE]; (y*7
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int top=-1; ,.A@U*j
int pivot; >-*rtiE
int pivotIndex,l,r; T~8= =Z{[
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stack[++top]=0; iyKAw
stack[++top]=data.length-1; 6!*be|<&
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while(top>0){ U5\^[~vW
int j=stack[top--]; X ^8@T
int i=stack[top--]; ^~9fQJNs
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pivotIndex=(i+j)/2; L-?
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pivot=data[pivotIndex]; zkt`7Pg;J
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SortUtil.swap(data,pivotIndex,j); z6)b XL[f
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//partition t~]n"zgovz
l=i-1; d,8L-pT$FM
r=j; ' ^E7T'v%
do{ 4'up bI
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Oi%\'biM
SortUtil.swap(data,l,r); e=Ko4Ao2y
} U6cpj
while(l SortUtil.swap(data,l,r); 1j"G~TM
SortUtil.swap(data,l,j); .ZQD`SRrI
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if((l-i)>THRESHOLD){ VwvL
stack[++top]=i; 1yC_/Va1
stack[++top]=l-1; gB|>[6
} Zgy~Y0Di
if((j-l)>THRESHOLD){ _N)/X|=~s
stack[++top]=l+1; .);~H#
stack[++top]=j; >9dzl#
} 17P5Dr&
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} E)sC:oO
//new InsertSort().sort(data); J=7.-R|t
insertSort(data); u_H=Xm)9
} Z*/{^ zsE
/** -Pt.
* @param data \]<eLw-v
*/ *U>"_h T0
private void insertSort(int[] data) { @n2Dt d
int temp; %hDx UZ#0
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); niC ;WK
} I]Ev6>=;
} ]Q0m]OaT
} sjGy=d{:oL
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} yX9 .yq
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