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快速排序: /4vG3
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package org.rut.util.algorithm.support; )w0AC"2O~
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import org.rut.util.algorithm.SortUtil; [BT/~6ovrZ
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/** Vv8jEZ8
* @author treeroot OujCb^Rm
* @since 2006-2-2 p\JfFfC
* @version 1.0 \'CDRr"uw
*/ 6Qx#%,U^ J
public class QuickSort implements SortUtil.Sort{ ;ByOth|9P
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/* (non-Javadoc) '*?WU_L(g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9Iz%ht
*/ rwG CUo6Z
public void sort(int[] data) { yq NzdzX
quickSort(data,0,data.length-1); l?Fb ='#
} x
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private void quickSort(int[] data,int i,int j){ 4=Krq6{
int pivotIndex=(i+j)/2; E5N{j4\F
//swap E[bd@[N
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SortUtil.swap(data,pivotIndex,j); 2c:#O%d(
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int k=partition(data,i-1,j,data[j]); yZ7,QsEsN
SortUtil.swap(data,k,j); .?!N^_ Ez3
if((k-i)>1) quickSort(data,i,k-1); @$2))g`
if((j-k)>1) quickSort(data,k+1,j); +{L<? "
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} jMN[J|us51
/** 8krpowVs~
* @param data [w&$| h:;
* @param i sSQs#+&=[
* @param j d R]Q$CJ
* @return L0tAgW!@
*/ mUz\ra;z
private int partition(int[] data, int l, int r,int pivot) { ?1[\!
do{ t6A:ZmG_
while(data[++l] while((r!=0)&&data[--r]>pivot); }LijnHH.
SortUtil.swap(data,l,r); !k/Pv\j/R
} (<Th=Fns?
while(l SortUtil.swap(data,l,r); ?w+Ix~k
return l; k!KDWb
} _+^ 2^TW
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改进后的快速排序: -pE(_
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package org.rut.util.algorithm.support; viAMr"z
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import org.rut.util.algorithm.SortUtil; @j4U^"_QB
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/** @mBX~ ?=Z3
* @author treeroot =Mb1o[
* @since 2006-2-2 bC3 F
* @version 1.0 2AVa(
*/ H-xFiF
public class ImprovedQuickSort implements SortUtil.Sort { Y2[A2Uy$ef
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private static int MAX_STACK_SIZE=4096; [M%9_CfZOy
private static int THRESHOLD=10; .<K
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/* (non-Javadoc) <uc1D/~^:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;kJu$U
*/ toaYsiIkzW
public void sort(int[] data) { {h KjD"?
int[] stack=new int[MAX_STACK_SIZE]; 7lo|dg80
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int top=-1; pW]4bx@E
int pivot; tWdhDt8$&
int pivotIndex,l,r; z 8*8OWM
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stack[++top]=0; '/I:^9
stack[++top]=data.length-1; tdF9NFMD
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while(top>0){ _7D _72
int j=stack[top--]; 34QfgMyH
int i=stack[top--]; TbehR:B5g
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pivotIndex=(i+j)/2; K"V:<a
pivot=data[pivotIndex]; >l+EJ3W
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SortUtil.swap(data,pivotIndex,j); {@u<3 s
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//partition 2 /y}a#s
l=i-1; Q#Y k?Kv~
r=j; 4{qB X?
do{ ==cd>03()
while(data[++l] while((r!=0)&&(data[--r]>pivot)); w&BGJYI
SortUtil.swap(data,l,r); pX=,iOF[I
} w#^U45y1v
while(l SortUtil.swap(data,l,r); .]|Zf!>}s
SortUtil.swap(data,l,j); wVq\FY%
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if((l-i)>THRESHOLD){ !eJCM`cp
stack[++top]=i; |8)Xc=Hz
stack[++top]=l-1; fRm}S>Nibb
} jvzBh-!
if((j-l)>THRESHOLD){ 1zktU.SZ
stack[++top]=l+1; ,eQ[Fi!!
stack[++top]=j; eu'1H@vX(
} @rb l^
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} a)2yE,":
//new InsertSort().sort(data); ?G?gy2
insertSort(data); *T4<&
} :[M[(
/** tk/`%Q
* @param data tLcEl'Eo
*/ WP-jtZ?!"
private void insertSort(int[] data) { Qrz4}0
int temp; i9UI,b%X
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); eSl-9
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} v@G4G*x\
} %B EC]
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} #/j ={*-
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} "uu)2Xe
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