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快速排序: T w/CJg
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package org.rut.util.algorithm.support; OHe<U8iu%
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import org.rut.util.algorithm.SortUtil; X%39cXM C
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/** l6a,:*_
* @author treeroot Kx$?IxZ
* @since 2006-2-2 7@|(z:uw
* @version 1.0 My
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*/ ,7k)cNstW
public class QuickSort implements SortUtil.Sort{ ;]+kC
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/* (non-Javadoc) X62z>mM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,$7LMTVDrE
*/ e2k!5OS
public void sort(int[] data) { _sJp"4?
quickSort(data,0,data.length-1); %UY=VE\F
} 5|&Sg}_
private void quickSort(int[] data,int i,int j){ .KTDQA\
int pivotIndex=(i+j)/2; %\Ig{Rj;
//swap v)4 kS
SortUtil.swap(data,pivotIndex,j); Q/-YLf.
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int k=partition(data,i-1,j,data[j]); __'Z0?.4#
SortUtil.swap(data,k,j); F2OU[Z,-]
if((k-i)>1) quickSort(data,i,k-1); *cq#>rN
if((j-k)>1) quickSort(data,k+1,j); ayHI(4!$j
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} 1m|1eAGS{
/** PBR+NHrZ
* @param data H Viu7kue`
* @param i 1K4LEga`
* @param j QWxCNt:^?
* @return cSoZq4
*/ ,1RW}1n
private int partition(int[] data, int l, int r,int pivot) { Su-LZ'C\
do{ NS mo(c>5
while(data[++l] while((r!=0)&&data[--r]>pivot); ~iydp
SortUtil.swap(data,l,r); N@Bqe{r6j
} YtxBkKiJ2V
while(l SortUtil.swap(data,l,r); Z;SRW92@
return l; UFC.!t-Z
} $1#|<|
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改进后的快速排序: &h8+-
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package org.rut.util.algorithm.support; qm@c[b
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import org.rut.util.algorithm.SortUtil; _OHz 6ag
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/** j#<#o:If
* @author treeroot DZ(e^vq
* @since 2006-2-2 X}h{xl
* @version 1.0 [&3G `8hY
*/ f+1)Ju~
public class ImprovedQuickSort implements SortUtil.Sort { DM~Q+C=Yr
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private static int MAX_STACK_SIZE=4096; ?)5}v4b
private static int THRESHOLD=10; 6(<AuhFu
/* (non-Javadoc) C
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =+A8s$Pb
*/ I^0bEwqZ~
public void sort(int[] data) { u.1u/o1"
int[] stack=new int[MAX_STACK_SIZE]; 5-5qm[.;
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int top=-1; YdhrFw0`~r
int pivot; `"Tx%>E(U
int pivotIndex,l,r; C Vyq/X
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stack[++top]=0; !>
stack[++top]=data.length-1; 6TlkPM$~2
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while(top>0){ F#O.i,
int j=stack[top--]; a:H}c9$%
int i=stack[top--]; WVf;uob{
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pivotIndex=(i+j)/2; =/Vr,y$
pivot=data[pivotIndex]; P=(\3ok
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SortUtil.swap(data,pivotIndex,j); b?h"a<7
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//partition d+ql@e ]
l=i-1; ){L`hQ*=w
r=j; GriL< =?t
do{ P_lk40X
while(data[++l] while((r!=0)&&(data[--r]>pivot)); b"/P
SortUtil.swap(data,l,r); &HT
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} "otP^X.
while(l SortUtil.swap(data,l,r); 0_,V}
SortUtil.swap(data,l,j); Z\4l+.R`
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if((l-i)>THRESHOLD){ UXR$ 7<D+
stack[++top]=i; C(xdiQJh
stack[++top]=l-1; j""u:l^+x
} Rb',"` 7
if((j-l)>THRESHOLD){ &NB[:S=
stack[++top]=l+1; bUU_NqUf*3
stack[++top]=j; ^W3xw[{
} ppmDmi~X
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} 3'
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//new InsertSort().sort(data); G0xk @SE
insertSort(data); AL3zE=BL
} pR; AqDQ
/** 4B^f"6'
* @param data gM^ Hs7o,
*/ > ~J&i3
private void insertSort(int[] data) { o3qBRT0[R
int temp; lk)38.
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6- s/\
} 9p9:nx\
} l"*zr ;#
} tg7%@SI5^-
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