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快速排序: k$x
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package org.rut.util.algorithm.support; E0B2>V
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import org.rut.util.algorithm.SortUtil; dpn&)?f
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/** b=
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* @author treeroot :2Rci`lp
* @since 2006-2-2 8J?`_
* @version 1.0
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*/ !#4HGjPI
public class QuickSort implements SortUtil.Sort{ kR~4O$riG
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/* (non-Javadoc) ABe^]HlH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) lGHu@(n<
*/ K2o0L5Lke
public void sort(int[] data) { -[7,ph
quickSort(data,0,data.length-1); #.L0]Uqcp
} 3)Awj++
private void quickSort(int[] data,int i,int j){ )I-?zyL
int pivotIndex=(i+j)/2; oS|~\,p"
//swap }~~^ZtJ\
SortUtil.swap(data,pivotIndex,j); )7%]<2V%
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int k=partition(data,i-1,j,data[j]); n6UU6t{
SortUtil.swap(data,k,j); uZ?CVluP
if((k-i)>1) quickSort(data,i,k-1); j72]_G
if((j-k)>1) quickSort(data,k+1,j); +P)[|y +e
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} ^8*SCM_A
/** s!fY^3
* @param data S9#N%{8P
* @param i [W;dguh
* @param j Csm!\I
* @return F`V[G(f+r
*/ wp GnS
private int partition(int[] data, int l, int r,int pivot) { Rf0\CEc
do{ JEF7hJz~
while(data[++l] while((r!=0)&&data[--r]>pivot); YM*6W?
SortUtil.swap(data,l,r); '2J6%Gg
} QV7c9)<]'}
while(l SortUtil.swap(data,l,r); o@` E.4
return l; _@;3$eB
} XoiYtx53
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^
} ?CZD^>6
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改进后的快速排序: 2bxMIr
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package org.rut.util.algorithm.support; q]%bd[zkz
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import org.rut.util.algorithm.SortUtil; vA-p}]%
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/** jz7ltoP
* @author treeroot <Jrb"H[T"
* @since 2006-2-2 u#,'ys
* @version 1.0 w:xKgng=L
*/ +4nR&1z$
public class ImprovedQuickSort implements SortUtil.Sort { .EZ{d
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private static int MAX_STACK_SIZE=4096; >^GCSPe
private static int THRESHOLD=10; g E+OQWu
/* (non-Javadoc) Z3~*R7G8>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D2cIVx3:(
*/ T*~)9o
public void sort(int[] data) { O36r
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int[] stack=new int[MAX_STACK_SIZE]; C|@k+^S
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int top=-1; w*P4_=
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int pivot; yBh"qnOT
int pivotIndex,l,r; sq|@9GS0T
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stack[++top]=0; `v2l1CQ:^
stack[++top]=data.length-1; Ngc+<
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while(top>0){ =usDI<3r
int j=stack[top--]; _`[6jhNa!
int i=stack[top--]; #$B,8LFz,$
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pivotIndex=(i+j)/2; U`_vF~el~
pivot=data[pivotIndex]; )&!@O$RS8(
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SortUtil.swap(data,pivotIndex,j); KrG6z#)Uz
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//partition at]Q4
l=i-1; H[k3)r2
r=j; 5(`GF|
do{ -gGK(PIf
while(data[++l] while((r!=0)&&(data[--r]>pivot)); !TZ/PqcE
SortUtil.swap(data,l,r); CyDf[C)=
} lfeWtzOf
while(l SortUtil.swap(data,l,r); 4EbiCSo
SortUtil.swap(data,l,j); ^Es)?>eah
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if((l-i)>THRESHOLD){ { (,vm}iFL
stack[++top]=i; dk`!UtNNRa
stack[++top]=l-1; j|dzd<kE6
} IqKXFORiNI
if((j-l)>THRESHOLD){ pv SFp-:_
stack[++top]=l+1; o`! :Q!+
stack[++top]=j; Fe<
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} 6YGr"Kj &
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} V46[whL%r
//new InsertSort().sort(data); &7u
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insertSort(data); #h|< >
} \9zC?Cw
/** F<Z=%M3e
* @param data &YKzK)@
*/ ,)G+h#Y[*
private void insertSort(int[] data) { q\Kdu5x{
int temp; =8_TOvSJ4p
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); vqZM89xY
} 31Mc<4zI8
} ]3jH^7[?
} TFPq(i
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} "0)G|pZI
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