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快速排序: cK2Us+h
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package org.rut.util.algorithm.support; "cX*GTNi8
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import org.rut.util.algorithm.SortUtil; p:qj.ukw
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/** qo0]7m7|
* @author treeroot QLyBP!X-
* @since 2006-2-2 PF-"^2&_
* @version 1.0 ON$-g_s>)
*/ Fy]j33E
public class QuickSort implements SortUtil.Sort{ b~m|mb$
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/* (non-Javadoc) T8J[B( )L
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V:
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*/ ,xIWyI.
public void sort(int[] data) { 3.I:`>;EO
quickSort(data,0,data.length-1); 9@z"~H
} Qtn%h:i
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private void quickSort(int[] data,int i,int j){ m_1BB$lyP2
int pivotIndex=(i+j)/2; 0Bhf(5
//swap (:T\<
SortUtil.swap(data,pivotIndex,j); W RVm^
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int k=partition(data,i-1,j,data[j]); "4qv
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SortUtil.swap(data,k,j); 6}e"$Ee}9
if((k-i)>1) quickSort(data,i,k-1); m-!Uy$yM
if((j-k)>1) quickSort(data,k+1,j); )3~):+
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} 'x!5fAy
/** 421ol
* @param data tsu Mt
* @param i DU-&bm
* @param j G2}e@L0
* @return fP:g}Z
*/ )%&~CW+
private int partition(int[] data, int l, int r,int pivot) { xA2"i2k9
do{ ,_2ZKO/k$
while(data[++l] while((r!=0)&&data[--r]>pivot); ;-X5#
SortUtil.swap(data,l,r); + %07J6
} ln6Hr^@5
while(l SortUtil.swap(data,l,r); `>cBR,)r
return l; X,h"%S<c#H
} K PSHBv-#
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} pe$l'ur
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改进后的快速排序: mVuZ}`
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package org.rut.util.algorithm.support; J
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import org.rut.util.algorithm.SortUtil; ix]t>2r
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/** 7}e73
* @author treeroot $.2#G"|
* @since 2006-2-2 3Rsbi
* @version 1.0 h|j$Jy
*/ qx~-(|s`H
public class ImprovedQuickSort implements SortUtil.Sort { >FabmIcC
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private static int MAX_STACK_SIZE=4096; /G h?z
private static int THRESHOLD=10; /
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/* (non-Javadoc) XNJPf) T
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3B5GsI
*/ G F-\WD
public void sort(int[] data) { P[E5e+A)
int[] stack=new int[MAX_STACK_SIZE]; aqk0+
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int top=-1; a.yCd/
int pivot; @Js^=G2
int pivotIndex,l,r; 54%@q[-
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stack[++top]=0; IE|$mUabm
stack[++top]=data.length-1; `i,l)X]
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while(top>0){ j%m9y_rg}
int j=stack[top--]; `'Af`u\R
int i=stack[top--]; )E.!jL:g
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pivotIndex=(i+j)/2; Pn*+g!`
pivot=data[pivotIndex]; :mwJJIjUW
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SortUtil.swap(data,pivotIndex,j); D 1Q@4
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//partition ,MxTT!9Su
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r=j; ;ctJ9"_g
do{ hv.$p5UY*
while(data[++l] while((r!=0)&&(data[--r]>pivot)); \Y0o~JD
SortUtil.swap(data,l,r); [%alnY
} AUm"^-@x#>
while(l SortUtil.swap(data,l,r); c05kHB$O
SortUtil.swap(data,l,j); &]'{N69@d?
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if((l-i)>THRESHOLD){ ;p!|E3o.
stack[++top]=i; 0'IV"eH2
stack[++top]=l-1; (|EnRk-E
} gua +-##)
if((j-l)>THRESHOLD){ bV5 {
stack[++top]=l+1; Cz%tk}2
stack[++top]=j; Be=J*D!E=>
} G>/Gw90E
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} Nm.H
//new InsertSort().sort(data); `m.).Hda
insertSort(data); =o@CCUKpj
} 'edd6yTd
/** Vy:I[@6@+
* @param data rfgkw
*/ UbD1h_b
private void insertSort(int[] data) { 7S_rN!E1i*
int temp; O]\6Pv@N
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); GESEj%R/b
} F~`Yh6v
} p5C:MA~*
} R aVOZ=^-
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} '@$YX*[
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