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快速排序: Xy8ie:D
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package org.rut.util.algorithm.support; X=c
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import org.rut.util.algorithm.SortUtil; z1KC$~{O
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/** ,tv9+n@x
* @author treeroot Ai_|)
* @since 2006-2-2 q!h*3mNm
* @version 1.0 )b2E/G@X&
*/ yW=hnV{
public class QuickSort implements SortUtil.Sort{ `R=_t]ie
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/* (non-Javadoc) AYQh=$)(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CH_Dat>
*/ h*X%:UbW
public void sort(int[] data) { . eag84_
quickSort(data,0,data.length-1); eRqexqO!
} ,["|wqM
private void quickSort(int[] data,int i,int j){ d~1"{WPSn
int pivotIndex=(i+j)/2; 'N,NG$G2
//swap 6Oqnb+
SortUtil.swap(data,pivotIndex,j); D30Z9_^%:
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int k=partition(data,i-1,j,data[j]); T+`GOFx
SortUtil.swap(data,k,j); O}iKPY8K
if((k-i)>1) quickSort(data,i,k-1); {aa,#B]i
if((j-k)>1) quickSort(data,k+1,j); JP% ;rAoJ
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}
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/** ]=XL9MI
* @param data @_:?N(%(
* @param i v&/-&(+
* @param j zSvHv s
* @return ](6vG$\
*/ @KRn3$U
private int partition(int[] data, int l, int r,int pivot) { ^0?cyv\>LA
do{ )^2jsy
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while(data[++l] while((r!=0)&&data[--r]>pivot); g<0%-p
SortUtil.swap(data,l,r); MKYE]D;
} 8\t7}8f
while(l SortUtil.swap(data,l,r); M
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return l; ~9jP++&
} &IPK5o,
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} Nm :lC%>X
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改进后的快速排序: ~ilBw:L-3
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package org.rut.util.algorithm.support; <+JFal
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import org.rut.util.algorithm.SortUtil; G/;aZ
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/** b0CaoSWo
* @author treeroot u^.k"46hn
* @since 2006-2-2 :qKY@-t7H
* @version 1.0 00x^zu?N
*/ Q2WrB+/
public class ImprovedQuickSort implements SortUtil.Sort { {'bkU9+
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private static int MAX_STACK_SIZE=4096; *1]k&#s
private static int THRESHOLD=10; 4U1fPyt
/* (non-Javadoc) [*E.G~IS`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wbKBwI5w
*/ !x /Z"
public void sort(int[] data) { Pb&+(j
int[] stack=new int[MAX_STACK_SIZE]; @MH]s [{o\
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int top=-1; -.3k
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int pivot; mP+yjRw
int pivotIndex,l,r; on&=%tCAL
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stack[++top]=0; :rc[j@|pH
stack[++top]=data.length-1; ~a,'
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while(top>0){ 1MFpuPJk
int j=stack[top--]; Olh-(u:9+O
int i=stack[top--]; mK&9p{4#U
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pivotIndex=(i+j)/2; i_^NbC
pivot=data[pivotIndex]; I`>%2mP[C
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SortUtil.swap(data,pivotIndex,j); RLX^'g+P
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//partition n,LKkOG
l=i-1; ]KT,s].
r=j; X.5LB!I)
do{ p arG
while(data[++l] while((r!=0)&&(data[--r]>pivot)); J~`%Nj5>
SortUtil.swap(data,l,r); RxG./GY
} @n'ss!h
while(l SortUtil.swap(data,l,r); YQsc(6
SortUtil.swap(data,l,j); ofv
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if((l-i)>THRESHOLD){ S*@0%|Q4r
stack[++top]=i; U MIZ:*j
stack[++top]=l-1; T<GD !j(
} 7OHw/-j\
if((j-l)>THRESHOLD){ nOzTHg8
stack[++top]=l+1; =x]dP.
stack[++top]=j; xM,(|p(
} K<(sqH
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} a$&6a
//new InsertSort().sort(data); o:*iT=l
insertSort(data); ixpG[8s
} mSeNM
/** '~a$f;: Dv
* @param data 2 ZXF_ o
*/ h%e!f#
private void insertSort(int[] data) { BBj"}~da
int temp; C{^@. 8:
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); iP_Xr~w
} ^<+heX
} ^Z+D7Q
} TnAX;+u
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} z*1K<w8
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