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快速排序: a^>e|Eq|
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package org.rut.util.algorithm.support; ]tnf<5x
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import org.rut.util.algorithm.SortUtil; "/~KB~bB
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/** ol #4AU`
* @author treeroot d"#& VlKcv
* @since 2006-2-2 9N*!C{VW
* @version 1.0 UVlXDebl
*/ 7&>==|gt
public class QuickSort implements SortUtil.Sort{ D3.$Vl,.
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/* (non-Javadoc) ^dP]3D1
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) enB2-)<K
*/
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public void sort(int[] data) { EA=EcUf'
quickSort(data,0,data.length-1); }u&,;]
} -S6^D/(;
private void quickSort(int[] data,int i,int j){ dZ;rn!dg>
int pivotIndex=(i+j)/2; TMAart;<
//swap RkTO5XO
SortUtil.swap(data,pivotIndex,j); ^3
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int k=partition(data,i-1,j,data[j]); [`/d$V!e
SortUtil.swap(data,k,j); _WB*ArR
if((k-i)>1) quickSort(data,i,k-1); 71wtO
if((j-k)>1) quickSort(data,k+1,j); u[b0MNE~
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} sNbCOTow
/**
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* @param data .J fV4!=o
* @param i =Dc9|WuHN
* @param j $QC^hC
* @return 34s>hm=0.
*/ Z0!yTM/C
private int partition(int[] data, int l, int r,int pivot) { &:}}T=@M1
do{ s{@3G8
while(data[++l] while((r!=0)&&data[--r]>pivot); LPK[^
SortUtil.swap(data,l,r); E
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} c3X8Wi7m
while(l SortUtil.swap(data,l,r); F2WMts
return l; gVU&Yl~/^
} Ps=<@,dks
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} 0OF ]|hH
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改进后的快速排序: g'nN#O
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package org.rut.util.algorithm.support; yr,Oq~e
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import org.rut.util.algorithm.SortUtil; y -
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/** fNNik7
* @author treeroot ^eHf'^Cvvu
* @since 2006-2-2 X0+M|8:
* @version 1.0 ns;nle|m
*/ n&;-rj^qq
public class ImprovedQuickSort implements SortUtil.Sort { ppXt8G3%x
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private static int MAX_STACK_SIZE=4096; rn"}@5
private static int THRESHOLD=10; ;y%C\YB#
/* (non-Javadoc) <h<4R Rj
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XJ9l,:c,
*/ WlfS|/\%V^
public void sort(int[] data) { oMer+=vH
int[] stack=new int[MAX_STACK_SIZE]; w7Y>B`wm?
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int top=-1; qwmZOR#
int pivot; 3|g]2|~w@h
int pivotIndex,l,r; xfqW~&
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stack[++top]=0; ~n$e
stack[++top]=data.length-1; 8jxs%N,aI
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while(top>0){ ?iQA>P9B
int j=stack[top--]; wU =@,K
int i=stack[top--]; ;.wWw" )
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pivotIndex=(i+j)/2; DGllJ_/Z
pivot=data[pivotIndex]; ngC|BLT%h
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SortUtil.swap(data,pivotIndex,j); @vcvte
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//partition &:ib>EB03=
l=i-1; q<` g
r=j; |[]"{Eo"}
do{ !`-/E']/
while(data[++l] while((r!=0)&&(data[--r]>pivot)); R9B !F{! 5
SortUtil.swap(data,l,r); V9o_Q
} }\oy?_8~
while(l SortUtil.swap(data,l,r); L8zY?v(bG
SortUtil.swap(data,l,j); s]p3dB#
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if((l-i)>THRESHOLD){ *0aU(E#
stack[++top]=i; E'J| p7
stack[++top]=l-1; Y"U -Rc
} -r!N;
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if((j-l)>THRESHOLD){ {t;{={$
stack[++top]=l+1; Ba],ONM4k
stack[++top]=j; M8, W|eTM
} B0^0d*8t|@
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} ci@U
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//new InsertSort().sort(data); jI8qiZ);~
insertSort(data); }cL9`a9j
} [V5ebj:6w
/** .cQ<F4)!tu
* @param data JWa9[Dj
*/ <[H1S@{W
private void insertSort(int[] data) { 0.~Pzg
int temp; Q`Q%;%t
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); WJ9= hr
} ^+JpI*,
} \V|\u= @H
} OgiElA.
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} @}K'Ic
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