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快速排序: .SG0}8gW
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package org.rut.util.algorithm.support; /[0F6
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import org.rut.util.algorithm.SortUtil; =Wj{]&`
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/** gyC^K3}
* @author treeroot HH7[tGF
* @since 2006-2-2 -eUV`&[4
* @version 1.0 NzAQ@E2d:
*/ Hr8\QgD<4
public class QuickSort implements SortUtil.Sort{ /;DjJpwf0
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/* (non-Javadoc) 60'6/3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) L5/mO6;k
*/ #`vVgGZ&
public void sort(int[] data) { 658\#x8|
quickSort(data,0,data.length-1); ja?s@Y}-9s
} VW {,:Ya
private void quickSort(int[] data,int i,int j){ }bp.OV-+
int pivotIndex=(i+j)/2; 3a%xn4P
//swap 5|CzX X#U
SortUtil.swap(data,pivotIndex,j); U>oW~Z
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int k=partition(data,i-1,j,data[j]); 'X54dXS?l
SortUtil.swap(data,k,j); }0Y`|H\v
if((k-i)>1) quickSort(data,i,k-1); NJ<N %hcjK
if((j-k)>1) quickSort(data,k+1,j); `y'aH
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} 2pz4rc
/** MZ)T0|S_
* @param data AhR0zg
* @param i ~,T+JX
* @param j Oohq9f#!
* @return )qmFK
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*/ vuZf#\zh}
private int partition(int[] data, int l, int r,int pivot) { Ym'7vW#~
do{ {b2 aL7
while(data[++l] while((r!=0)&&data[--r]>pivot); p(.N(c
SortUtil.swap(data,l,r); )'`CC>Q
} |!oXvXU
while(l SortUtil.swap(data,l,r); lO[E[c G
return l; q4)Ey
} uNy!<u
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} ?;_H{/)m
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改进后的快速排序: +ZX.1[O
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package org.rut.util.algorithm.support; X CzXS.
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import org.rut.util.algorithm.SortUtil; AO $Wy@
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/** 5\&]J7(
* @author treeroot Uh}+"h5
* @since 2006-2-2 IYLZ
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* @version 1.0 T RDxT
*/ 3 tF:
public class ImprovedQuickSort implements SortUtil.Sort { vnL?O8`c
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private static int MAX_STACK_SIZE=4096; ).Q[!lly
private static int THRESHOLD=10; '=p?
/* (non-Javadoc) BR3wX4i\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -n-Z/5~ X
*/ "
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public void sort(int[] data) { s@PLS5d"
int[] stack=new int[MAX_STACK_SIZE]; QypZH"Np
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int top=-1; Ts#pUoE~+H
int pivot; Wa<-AZnh
int pivotIndex,l,r; 9ZhDZ~)p,
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stack[++top]=0; ]hL:33
stack[++top]=data.length-1; a}dw9wU!:
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while(top>0){ [<Q4U{F
int j=stack[top--]; ?;_O
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int i=stack[top--]; >C*4_J7
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pivotIndex=(i+j)/2; lA]N04 d
pivot=data[pivotIndex]; _CL{IY
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SortUtil.swap(data,pivotIndex,j); me:iQ.g
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//partition JL``iA
l=i-1; [Teh*CV
r=j; `|,Bm|~:
do{ FllX za)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 9*DEv0}a^
SortUtil.swap(data,l,r); 5x2L(l-2
} yuv4*
while(l SortUtil.swap(data,l,r); "|hlDe<
SortUtil.swap(data,l,j); 6<PW./rk:
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if((l-i)>THRESHOLD){ 14-]esSa
stack[++top]=i; dWUUxKC
stack[++top]=l-1; }2=hd. .
} Sk$KqHX(
if((j-l)>THRESHOLD){ Fv A8T2-v
stack[++top]=l+1; _N@(Y :
stack[++top]=j; F<gMUDB
} )P%4:P
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} fdLBhe#9M
//new InsertSort().sort(data); 9(Jy0]E~
insertSort(data); R(`]n!V2
} D7gHE
/** ]VDn'@uM
* @param data #2N_/J(U
*/ X|' 2R^V.
private void insertSort(int[] data) { MnS+ nH!d
int temp; DN<M?u]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ?<6@^X"
} c$A@T~$
} -"tY{}z
} kT2Wm/L
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