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快速排序: NbPv>/r
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package org.rut.util.algorithm.support; Qo7]fnnaV
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import org.rut.util.algorithm.SortUtil; }[a
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/** %J`cYn#
* @author treeroot a#i;*J
* @since 2006-2-2
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* @version 1.0 &m@~R|
*/ r=8(n<;Co
public class QuickSort implements SortUtil.Sort{ V[&4Km9C
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/* (non-Javadoc) x[]}Jf{t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "o+E9'Dm
*/ I"/p^@IX
public void sort(int[] data) { ROZOX$XM
quickSort(data,0,data.length-1); t;ZA}>/
} aYIAy]*1e
private void quickSort(int[] data,int i,int j){ _&0_@
int pivotIndex=(i+j)/2; i|zs
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//swap BJzNh>-#=
SortUtil.swap(data,pivotIndex,j); e))fbv&V
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int k=partition(data,i-1,j,data[j]); .<Y7,9;YEF
SortUtil.swap(data,k,j); Oy>u/g~
if((k-i)>1) quickSort(data,i,k-1); DQ'yFPE
if((j-k)>1) quickSort(data,k+1,j); &p>VTD
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} * !4r}h`
/** ^{L/) Xy5
* @param data "YY6_qQR'
* @param i o[C,fh,$
* @param j }Yd7<"kp
* @return eJWcrVpn
*/ /b3b0VfF
private int partition(int[] data, int l, int r,int pivot) { \^7D%a=;C
do{ TiiMX
while(data[++l] while((r!=0)&&data[--r]>pivot); +:@lde]/p
SortUtil.swap(data,l,r); u,]?_bK)
} {9(#X]'
while(l SortUtil.swap(data,l,r); F'eV%g
return l; X%iiz
} Oj6PmUK4
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} <PCa37
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改进后的快速排序: Ja$Ple*XU8
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package org.rut.util.algorithm.support; c rx8+
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import org.rut.util.algorithm.SortUtil; 5[^pU$Y
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/** P+tnXT>nE
* @author treeroot zoFCHsr
* @since 2006-2-2 ZaxBr
* @version 1.0 E+>$@STv#
*/ |3tq.JU
public class ImprovedQuickSort implements SortUtil.Sort { GEJEhwO;H
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private static int MAX_STACK_SIZE=4096;
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private static int THRESHOLD=10; R $vo
/* (non-Javadoc) p#['CqP8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J!l/!Z>!cF
*/ }=)
public void sort(int[] data) { zCOzBL/1q
int[] stack=new int[MAX_STACK_SIZE]; p[kEFE,%
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int top=-1; ko-:)z
int pivot; NWK+.{s>m
int pivotIndex,l,r; 85$W\d
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stack[++top]=0; |7
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stack[++top]=data.length-1; )_$F/ug
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while(top>0){ u 3&9R)J1
int j=stack[top--]; 0FL PZaRP
int i=stack[top--]; zq(R !a6
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pivotIndex=(i+j)/2; Aw]W- fx
pivot=data[pivotIndex]; Dwvd
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SortUtil.swap(data,pivotIndex,j); 3v oas
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//partition xp+Z%0D
l=i-1; {yPJYF_l
r=j; B2}|b^'I
do{ R?,O h*
while(data[++l] while((r!=0)&&(data[--r]>pivot)); MoIq)5/
SortUtil.swap(data,l,r); 7 (}gs?&w
} T@V<J'
while(l SortUtil.swap(data,l,r); (]*otVJ
SortUtil.swap(data,l,j); ?`jh5Kw%y
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if((l-i)>THRESHOLD){ s@Q,
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stack[++top]=i; _FG?zE
stack[++top]=l-1; !1g2'
} <,r(^Ntz
if((j-l)>THRESHOLD){ G}MJWf Hl
stack[++top]=l+1; EX]LH({?+L
stack[++top]=j; 5~AK+6Za
} r-Nv<oH;
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} F=/@D)hND
//new InsertSort().sort(data); ;>#YOxPl
insertSort(data); A^ :/*
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/** }3{ x G+,
* @param data )FF3|dZ";K
*/ S"*M9*8
private void insertSort(int[] data) { Us5P?}
int temp; eiiI Wr_7
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ]yvHb)X
}
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} 4T]n64Yid
} ^ Tr )gik
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} 6xFvu7L_c;
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