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快速排序: )^2eC<t
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package org.rut.util.algorithm.support; >oh H4:
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import org.rut.util.algorithm.SortUtil; +y7z>Fwl
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/** 0I}e>]:I
* @author treeroot 'B@`gA
* @since 2006-2-2 m[hL
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* @version 1.0 %!aU{E|@_
*/ oA1_W).wJ
public class QuickSort implements SortUtil.Sort{ TP }a9-9?
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/* (non-Javadoc) . [|UNg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SZyk G[
*/ iD^,O)b
public void sort(int[] data) { Jt~Ivn,
quickSort(data,0,data.length-1); hI[}
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}
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private void quickSort(int[] data,int i,int j){ ! 'zd(kv<
int pivotIndex=(i+j)/2; [ks_wvY:'
//swap y^.66BH
SortUtil.swap(data,pivotIndex,j); hor7~u+
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int k=partition(data,i-1,j,data[j]); bIQ,=EA1
SortUtil.swap(data,k,j); x4_IUIgh
if((k-i)>1) quickSort(data,i,k-1); .)Tj}Im2p
if((j-k)>1) quickSort(data,k+1,j); q"2QNF'
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} ]#!uke Q
/** ((y|?Z$
* @param data aDlp>p^E>
* @param i Fs+tcr/\[
* @param j ?h<4trYcv
* @return @W,jy$U
*/ )G[byBa
private int partition(int[] data, int l, int r,int pivot) { BK$y>=
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do{ 'Zx5+rM${}
while(data[++l] while((r!=0)&&data[--r]>pivot); V<ESjK8
SortUtil.swap(data,l,r); UwN Vvo
} `L1,JE`
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while(l SortUtil.swap(data,l,r); C]^Ep
return l; i'~-\F!
} k"wQ9=HP7
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} 7qKz_O
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改进后的快速排序: w5FIHYl6B
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package org.rut.util.algorithm.support; F(")ga$r
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import org.rut.util.algorithm.SortUtil; }=R]<`Sj.j
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/** ZOK!SBn^?
* @author treeroot PyeNu3Il4
* @since 2006-2-2 6[bopin
* @version 1.0 D9rQ%|}S
*/ *TOd Iq&z
public class ImprovedQuickSort implements SortUtil.Sort { .i0K-B
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private static int MAX_STACK_SIZE=4096; hpdI5
private static int THRESHOLD=10; A40DbD\^ad
/* (non-Javadoc) >e]g T
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) o3WOp80hz
*/ ChBf:`e
public void sort(int[] data) { ,H7X_KbFD4
int[] stack=new int[MAX_STACK_SIZE]; oFk2y ^>u
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int top=-1; XF`2*:7
int pivot; P^Hgm
int pivotIndex,l,r; +Y;P*U}Qg[
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stack[++top]=0; h>Kx
stack[++top]=data.length-1; ,EqQU|
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while(top>0){ HU0.)tD
int j=stack[top--]; #G9
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int i=stack[top--]; sz7*x{E
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pivotIndex=(i+j)/2; !j~wAdHk
pivot=data[pivotIndex]; DP_b9o
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SortUtil.swap(data,pivotIndex,j); vHaM yA-
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//partition nz 10/nw
l=i-1; R'c*CLaiE
r=j; ,0'GHQWz$
do{ %G?@Hye3
while(data[++l] while((r!=0)&&(data[--r]>pivot)); d3%qYL_+a
SortUtil.swap(data,l,r); Y,L`WeQY.
} )"x6V""Rb
while(l SortUtil.swap(data,l,r); c~|(j \FI
SortUtil.swap(data,l,j); !Vpi1N\
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if((l-i)>THRESHOLD){ U32$9"
stack[++top]=i; UB~K/r`.|
stack[++top]=l-1; H4M=&"ll}
} Ae5A@4
if((j-l)>THRESHOLD){ 4KPnV+h"b
stack[++top]=l+1; O>`k@X@9/
stack[++top]=j; (Tx_`rO4VY
} ,GOIg|51
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} W]4Z4&