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快速排序: _P<lG[V
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package org.rut.util.algorithm.support; :6$4K"^1
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import org.rut.util.algorithm.SortUtil; 18"VB50b}
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/** iW@Vw{|i I
* @author treeroot 1m`tqlFU9
* @since 2006-2-2 bo;pj$eR3R
* @version 1.0 i!W8Q$V
*/ S@xsAib0J
public class QuickSort implements SortUtil.Sort{ pLQSG}N
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/* (non-Javadoc) Z4AAg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) //M4Sq(
*/ :aq>
public void sort(int[] data) { /QXs-T}d
quickSort(data,0,data.length-1); aE\BAbD7
} ?4>y2!OC9
private void quickSort(int[] data,int i,int j){ Bdq"6SK>
int pivotIndex=(i+j)/2; cL)rjty2
//swap c =N]!
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SortUtil.swap(data,pivotIndex,j); bEQtVe@`
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int k=partition(data,i-1,j,data[j]); V2s}<uG
SortUtil.swap(data,k,j); gQh Ccv
if((k-i)>1) quickSort(data,i,k-1); reM
if((j-k)>1) quickSort(data,k+1,j); cF&h$4-
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} Ac!&j=ZE
/** +%#MrNM'
* @param data \8*,&ak%
* @param i ,AbKxT
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* @param j :@>br+S
* @return 9U<)_E<y
*/ SZ2q}[o`R
private int partition(int[] data, int l, int r,int pivot) { }C{}oLz
do{ Q)6wkY+!
while(data[++l] while((r!=0)&&data[--r]>pivot); }1]!#yMfq
SortUtil.swap(data,l,r); OgXZ-<'
} oA;jy
while(l SortUtil.swap(data,l,r); H@2v<e@
return l; V1`5D7Z
} #HM\a
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改进后的快速排序: Kcw1uLb
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package org.rut.util.algorithm.support; o?va#/fk
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import org.rut.util.algorithm.SortUtil; K_&c5(-(_
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/** YoF\MT]W
* @author treeroot 1>@]@ST[:
* @since 2006-2-2 zK>'tFU
* @version 1.0 \Qi#'c$5+a
*/ [t
public class ImprovedQuickSort implements SortUtil.Sort { |.8d,!5w}
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private static int MAX_STACK_SIZE=4096; }r~v,KDb
private static int THRESHOLD=10; ll(e,9.D
/* (non-Javadoc) mF*?e/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /h7>Z9T
*/ Y*kh$E%<#
public void sort(int[] data) { qXU:A-IdIl
int[] stack=new int[MAX_STACK_SIZE]; Z9"{f)T
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int top=-1; 4h;f>BG
int pivot; z[5Y
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int pivotIndex,l,r; [/AdeR
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stack[++top]=0; Pu$kj"|q*[
stack[++top]=data.length-1; *CH!<VB/
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while(top>0){ d(X\B{
int j=stack[top--]; K#l
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int i=stack[top--]; 5DkK'tCI9Z
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pivotIndex=(i+j)/2; 0H OoKh
pivot=data[pivotIndex]; lTV@b&
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SortUtil.swap(data,pivotIndex,j); NoJnchiU
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//partition _@#uIOcE
l=i-1; _OJ0 < {E
r=j; '<?v:pb9
do{ ]^*_F
while(data[++l] while((r!=0)&&(data[--r]>pivot)); QH7V_#6bKP
SortUtil.swap(data,l,r); Jb3>vCIn
}
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while(l SortUtil.swap(data,l,r); J|gdO+
SortUtil.swap(data,l,j); Ei{(
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if((l-i)>THRESHOLD){ IS,zy+w
stack[++top]=i; DnNt@e2|
stack[++top]=l-1; j}rgOz.
} XlPK3^'N)h
if((j-l)>THRESHOLD){ <pTQpU
stack[++top]=l+1; $PatHY@h
stack[++top]=j; Tn4W\?R
} .Bb$j=
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} i"%JFj_G
//new InsertSort().sort(data); uQ[vgNe*m
insertSort(data); ,zAK3d&hj
} bU;}!iVc]
/** Mvy6"Q:
* @param data LN@E\wRw{r
*/ aW0u8Dz
private void insertSort(int[] data) { RNv{n
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int temp; Iz6ss(UJ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); U8-Q'1IT&
} j>$=SMc
} pau*kMu^}
} tJUVw=
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