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快速排序: Yw_^]:~
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package org.rut.util.algorithm.support; !/RL.`!>
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import org.rut.util.algorithm.SortUtil; ')#!M\1,HQ
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/** A$o7<Hx
* @author treeroot 0wnC"2GUX
* @since 2006-2-2 7Z[6_WD3
* @version 1.0 h51)kN:
*/ O@-|_N*;K
public class QuickSort implements SortUtil.Sort{ Sxzt|{
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/* (non-Javadoc) *)u%KYGr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H05xt$J
*/ % db
public void sort(int[] data) { V3v/hV:
quickSort(data,0,data.length-1); J-d>#'Wb|
} *1c1XN<7
private void quickSort(int[] data,int i,int j){ e61e|hoX\
int pivotIndex=(i+j)/2; '?)<e^
//swap :F`-<x/
SortUtil.swap(data,pivotIndex,j); c>.=;'2
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int k=partition(data,i-1,j,data[j]); cl1>S 3
SortUtil.swap(data,k,j); Or<OmxJg
if((k-i)>1) quickSort(data,i,k-1); oj%(@6L
if((j-k)>1) quickSort(data,k+1,j); (F=q/lK$
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} (JdZl2A.
/** w gU2q|
* @param data =GJ)4os
* @param i ~b;u1;ne
* @param j .h
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* @return '<-F3
*/ 'gv~M_
private int partition(int[] data, int l, int r,int pivot) { y1Op Z
do{ 26B+qXEt
while(data[++l] while((r!=0)&&data[--r]>pivot); 94Q?)0W$
SortUtil.swap(data,l,r); q)Qg'l^f
} *wp>a?sG\
while(l SortUtil.swap(data,l,r); _Y _v&
return l; C2(VYw
} wzf%~ats
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改进后的快速排序: mZ0'-ax
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package org.rut.util.algorithm.support; aaRc?b'/
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import org.rut.util.algorithm.SortUtil; Gph:'3
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/** hmp!|Q[)
* @author treeroot 7&w$@zs87
* @since 2006-2-2 /5N`Euw
* @version 1.0 p,K!'\
*/ JDP /vNq
public class ImprovedQuickSort implements SortUtil.Sort { f=paa/k0
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private static int MAX_STACK_SIZE=4096; _;'<}a
private static int THRESHOLD=10; k@}g?X`8
/* (non-Javadoc) L =9^Y/8Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &e)V!o@wJV
*/ P&sYS<9q
public void sort(int[] data) { B2T=O %
int[] stack=new int[MAX_STACK_SIZE]; [DD#YL\P
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int top=-1; sg%Ptp
int pivot; N:~CN1
int pivotIndex,l,r; SL5QhP
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stack[++top]=0; 4 zhg#
stack[++top]=data.length-1; <*[D30<
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while(top>0){ ^{g('BQx
int j=stack[top--]; "Ta"5XW
int i=stack[top--]; *o6hDhg
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pivotIndex=(i+j)/2; BFvRU5&Sz
pivot=data[pivotIndex]; Pq3m(+gf
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SortUtil.swap(data,pivotIndex,j); |3P dlIbO
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//partition 7p_B?r
l=i-1; ;!pSYcT,
r=j; 4_W*LG~2s
do{ )MeeF-Ad6
while(data[++l] while((r!=0)&&(data[--r]>pivot)); O#n=mJ
SortUtil.swap(data,l,r); dM)x|b3z
} ;5&=I|xqe
while(l SortUtil.swap(data,l,r); S+7u,%n/
SortUtil.swap(data,l,j); Z3 O_K
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if((l-i)>THRESHOLD){ LO@o`JF
stack[++top]=i; bzyy;`;6Q~
stack[++top]=l-1; 6<Txkk
} a/TeBx#yG
if((j-l)>THRESHOLD){ 8iUYZF
stack[++top]=l+1; ,w%hD*
stack[++top]=j; w,1&s};g\
} wo5fGQJ
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} P2g}G4qf
//new InsertSort().sort(data); CZDWEM}
insertSort(data); b^R_8x
} =4#p|OZP
/** l5FKw;=K}:
* @param data IiM=Z=2
*/ 3XcFBFE
private void insertSort(int[] data) { &~V6g(9
int temp; MuF{STE>->
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); X86r`}
} ZZrvl4h
} ~S~4pK
} h
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} _<u>?
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