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快速排序: A|YiSwyy
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package org.rut.util.algorithm.support; XhUVDmeUMb
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import org.rut.util.algorithm.SortUtil; ,\T7{=ZG\!
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/** Pk>S;KT.
* @author treeroot nK}-^Ur
* @since 2006-2-2 <%.lPO]&E
* @version 1.0 t;V^OGflv
*/ L7[f-cK2:
public class QuickSort implements SortUtil.Sort{ OXnTD!m>{
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/* (non-Javadoc) }W0_eQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G
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*/ qM<CBcON
public void sort(int[] data) { \k{d'R#~(
quickSort(data,0,data.length-1); Mm;[f'{M)
} 3&6sQ-}*
private void quickSort(int[] data,int i,int j){ "}vxHN#
int pivotIndex=(i+j)/2; 4~1lP&
//swap 6^lix9q7
SortUtil.swap(data,pivotIndex,j); 0?cJ>)N
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int k=partition(data,i-1,j,data[j]); (8~D^N6Z
SortUtil.swap(data,k,j); a"l\_D'.K8
if((k-i)>1) quickSort(data,i,k-1); yKy
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if((j-k)>1) quickSort(data,k+1,j); k"|Fu
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} 6F5g2hBz
/** WIabQ_ fX
* @param data Tp|>(~;ai
* @param i Y]7 6y>|e
* @param j bFSs{\zE
* @return (3~^zwA
*/ ICiGZ'k
private int partition(int[] data, int l, int r,int pivot) { gJ~CD1`O
do{ #r/5!*3
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); I^HwXp([
} $z`l{F4eMf
while(l SortUtil.swap(data,l,r); "L!U7|9J
return l; 'uF75C
} B<ue}t
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} %=$Knc_!T^
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改进后的快速排序: &*745,e
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package org.rut.util.algorithm.support; e]5NA?2j
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import org.rut.util.algorithm.SortUtil; {u+=K-Bj
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/** j#xGB]
* @author treeroot "dT"6,
* @since 2006-2-2 10)RLh|+
* @version 1.0 {T-^xwc
*/ 1 e]D=2y
public class ImprovedQuickSort implements SortUtil.Sort { `F]
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private static int MAX_STACK_SIZE=4096; \C>+ubF
private static int THRESHOLD=10; Zl{9G?abCT
/* (non-Javadoc) `sDLxgwI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2j#Dwa(lZQ
*/ U#&+n-npO
public void sort(int[] data) { Kr[oP3
int[] stack=new int[MAX_STACK_SIZE]; s4QCun~m
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int top=-1; +prUau*
int pivot; ns*:mGh
int pivotIndex,l,r; #SG.`J<%
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stack[++top]=0; -2(?O`tZ
stack[++top]=data.length-1; IMBjI#\
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while(top>0){ =XK}eQ_d
int j=stack[top--]; |KY-kRN7
int i=stack[top--]; <LzxnTx=
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pivotIndex=(i+j)/2; ens]?,`0
pivot=data[pivotIndex]; t\}_WygN
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SortUtil.swap(data,pivotIndex,j); z;y{QO
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//partition B"zB=Aw
l=i-1; Xk/iyp/
r=j; ~y?Nn8+&f
do{ #oR`_Dm)P
while(data[++l] while((r!=0)&&(data[--r]>pivot)); \XYidj
SortUtil.swap(data,l,r); )2#&l
} "LJV}L
while(l SortUtil.swap(data,l,r); 9X,iQ
SortUtil.swap(data,l,j); 5423Ky<
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if((l-i)>THRESHOLD){ _/'VD!(MV
stack[++top]=i; T?QW$cU!e:
stack[++top]=l-1; @56*r@4:q
} 6yO5{._M
if((j-l)>THRESHOLD){ ~( 0bqt3c
stack[++top]=l+1; u{h67N
stack[++top]=j; znSlSQpTv
} I$p1^8~L
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} 0kNKt(_
//new InsertSort().sort(data); DA04llX~
insertSort(data); 5!cp^[rGL
} Sc#3<nVg
/** @}:E{J#g
* @param data ?qi~8.<w
*/ K~2sX>l
private void insertSort(int[] data) { j*[P\Cm
int temp; /zb/am1#
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); (z.n9lkfi
} ZNM9@;7
} |TP,
} ^,mN-.W
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