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快速排序: hjx)D
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package org.rut.util.algorithm.support; ?kw&=T!
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import org.rut.util.algorithm.SortUtil; +#J,BKul
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/** 2GmpCy`L"
* @author treeroot D<{{ :7n
* @since 2006-2-2 T5Eseesp
* @version 1.0 X~.f7Ao[
*/ kdx
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public class QuickSort implements SortUtil.Sort{ ?/*~;fM
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/* (non-Javadoc) 7EhN u@5-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #<7O08:
*/ 'rP]Nw
public void sort(int[] data) { &sVvWNO#2
quickSort(data,0,data.length-1); 9?T{}| ?
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private void quickSort(int[] data,int i,int j){ [|`U6
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int pivotIndex=(i+j)/2; L *[K>iW
//swap c8 K3.&P6
SortUtil.swap(data,pivotIndex,j); lt'I,Xt
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int k=partition(data,i-1,j,data[j]); *DI)?
SortUtil.swap(data,k,j); s$h]
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if((k-i)>1) quickSort(data,i,k-1); G`=r^$.3WB
if((j-k)>1) quickSort(data,k+1,j); 0Sl]!PZR1
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} C"T1MTB
/** 2h30\/xkU
* @param data woH)0v
* @param i pj|pcv^
* @param j ~rbIMF4T`]
* @return )4Q?aMm
*/ 5__+_hO
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private int partition(int[] data, int l, int r,int pivot) { }peBR80tQ
do{ U$&hZ_A
while(data[++l] while((r!=0)&&data[--r]>pivot); ^W83ByP
SortUtil.swap(data,l,r); Doze8pn
} 7J$b$P0}
while(l SortUtil.swap(data,l,r); {43yb_B(
return l; BF|(!8S$U
} V)o,1
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改进后的快速排序: OIb
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package org.rut.util.algorithm.support; $.6K!x{(
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import org.rut.util.algorithm.SortUtil; Z*{]
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/** @pV5}N[]
* @author treeroot 6x{<e4<n
* @since 2006-2-2 D.!~dyI.,$
* @version 1.0 X##1!
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*/ yWPIIWHx!
public class ImprovedQuickSort implements SortUtil.Sort { D?jk$^p~m#
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private static int MAX_STACK_SIZE=4096; #eP
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private static int THRESHOLD=10; 2pHR_mrb
/* (non-Javadoc) z~6y+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Upl6:xYrG
*/ $L4/I !Yf
public void sort(int[] data) { R
int[] stack=new int[MAX_STACK_SIZE]; 4] > ]-b
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int top=-1; co 4h*?q
int pivot; ^^` Jcd/
int pivotIndex,l,r; Z]w#vLR
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stack[++top]=0; x LBQ
stack[++top]=data.length-1; =`n]/L"Q
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while(top>0){ u#7+U\
int j=stack[top--]; 8$N8}q%
int i=stack[top--]; gxPx&Z6jF
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pivotIndex=(i+j)/2; fBtm%f
pivot=data[pivotIndex]; WnFG{S{s
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SortUtil.swap(data,pivotIndex,j); aMARZ)V
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//partition T Zir>5
l=i-1; UnDgu4#R`A
r=j; /T^ JS
do{ ylf[/='0K
while(data[++l] while((r!=0)&&(data[--r]>pivot)); inPJ2uBD\^
SortUtil.swap(data,l,r); `7aDEzmJ
} /e\{
while(l SortUtil.swap(data,l,r); /NT[ETMk+
SortUtil.swap(data,l,j); g3@Rl2yQJ
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if((l-i)>THRESHOLD){ F-(dRSDNM
stack[++top]=i; jcCoan
stack[++top]=l-1; ?8dVH2W.
} PMs z`
if((j-l)>THRESHOLD){ e)nimq
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stack[++top]=l+1; k?BJdg)xJ
stack[++top]=j; P=L$;xgp
} 6TWWlU^e
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} gIWrlIV{9
//new InsertSort().sort(data); $VG*q
insertSort(data); fjo{av~]y
} ?q`0ZuAg\<
/** z_;3H,z`
* @param data $FH18
*/ js^ ,(CS
private void insertSort(int[] data) { 4:3rc7_
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int temp; 6q<YJ.,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); J;t 7&Zpe
} vq*Q.0 M+
} CD j~;$[B
} PW(\4Q\
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} uy _wp^
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