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快速排序: *izPLM}+
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package org.rut.util.algorithm.support; OAPR wOQ^=
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import org.rut.util.algorithm.SortUtil; r&sm&4)p-5
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/** t mAj
* @author treeroot g a|RW0
* @since 2006-2-2 bM7y}P5`1
* @version 1.0 oC0K!{R*
*/ [=*c8
public class QuickSort implements SortUtil.Sort{ rT$J0"*=
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/* (non-Javadoc) 2w)[1s[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p12'^i |
*/ g4USKJ19.
public void sort(int[] data) { r0kJx$f
quickSort(data,0,data.length-1); U-/-aNJ]U
} @+II@[_lT
private void quickSort(int[] data,int i,int j){ |9>?{
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int pivotIndex=(i+j)/2; _kUf[&
//swap @IL_
SortUtil.swap(data,pivotIndex,j); XnC`JO+7M
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int k=partition(data,i-1,j,data[j]); d|5V"U]W;
SortUtil.swap(data,k,j); j8WMGSrrF
if((k-i)>1) quickSort(data,i,k-1); ! bbVa/
if((j-k)>1) quickSort(data,k+1,j); xo{3r\u?}
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} yZ?|u57
/** Wr+?ul*_
* @param data oc.H}Eb%Z
* @param i
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* @param j ! Ra.DSL
* @return BR\3ij
*/ gBM6{48GF
private int partition(int[] data, int l, int r,int pivot) { RC(fhqV
do{ W*A-CkrO
while(data[++l] while((r!=0)&&data[--r]>pivot); DyeV
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SortUtil.swap(data,l,r); =7%1]
} xb/L AlJ
while(l SortUtil.swap(data,l,r); E__^>=
return l; UeNa
} 7hAFK
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} i'Vrx(y3
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改进后的快速排序: yt,xA;g
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package org.rut.util.algorithm.support; (!kd9uV
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import org.rut.util.algorithm.SortUtil; pqmb&"l
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/** =TImx.D:
* @author treeroot tXj28sh$
* @since 2006-2-2 T=lir%q
* @version 1.0 |+Gv)Rvp
*/ bvHF;Qywg
public class ImprovedQuickSort implements SortUtil.Sort { &k'J5YHm8H
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private static int MAX_STACK_SIZE=4096; f-6hcd@Ca
private static int THRESHOLD=10; paFiuQ
/* (non-Javadoc) d+FS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,_HSvs7-
*/ E/x2LYH
public void sort(int[] data) { (`S32,=TS
int[] stack=new int[MAX_STACK_SIZE]; V%k #M
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int top=-1; tbz?th\#
int pivot; OsS5WY0H
int pivotIndex,l,r; j2GO ZKy
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stack[++top]=0; ]fc9m~0N,\
stack[++top]=data.length-1; #1-y[w/
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while(top>0){ [UO?L2$&
int j=stack[top--]; aH@Ux?-}
int i=stack[top--]; 1&{]jG{#
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pivotIndex=(i+j)/2; Y{c_5YYf
pivot=data[pivotIndex]; zY?GO"U"
RU}
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SortUtil.swap(data,pivotIndex,j); cEkf9:_La
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//partition EW;R^?Z
l=i-1; a.P7O!2Lp
r=j; 7A7=~:l\G
do{ 5Ym/'eT
while(data[++l] while((r!=0)&&(data[--r]>pivot)); #"tHT<8 u
SortUtil.swap(data,l,r); JNY;;9o
} lPcp 17U
while(l SortUtil.swap(data,l,r); [x}]sT`#a
SortUtil.swap(data,l,j); V&7jd7
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if((l-i)>THRESHOLD){ tI651Wm9
stack[++top]=i; 5sbMp;ZM
stack[++top]=l-1; V6)e Jy
} bWc3a
if((j-l)>THRESHOLD){ Y\e,#y
stack[++top]=l+1; ]Z/<HP$#
stack[++top]=j; z#qlu=
} rn1^6qy)
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} /_Z--s>j
//new InsertSort().sort(data); HsA4NRF'7
insertSort(data); u\~dsD2)q
} L2"fO
/** PnB%vS
* @param data QbGc 9MM
*/ ^,@!L-<~(b
private void insertSort(int[] data) { SM> V
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int temp; #$h~QBg
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); &Nf10%J'<
} Tac7+=T
} JffjGf-o
} N[$bP)h7
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} d*7nz=0&$
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