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快速排序: ]5i]2r1
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package org.rut.util.algorithm.support; S?LUSb
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import org.rut.util.algorithm.SortUtil; i?pC[Ao-_
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/** wDS(zG
* @author treeroot g7U>G=,;?U
* @since 2006-2-2 a$P$Ngi?S
* @version 1.0 q| 7$@H^*
*/ ]k.'~Syz
public class QuickSort implements SortUtil.Sort{ QDJ:LJz\
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/* (non-Javadoc) #`{L_n$c
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) j+>&~
*/ -
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public void sort(int[] data) { :~+m9r
quickSort(data,0,data.length-1); w?zY9Fs=s
} joJ:*oL
private void quickSort(int[] data,int i,int j){ "?TKz:9r
int pivotIndex=(i+j)/2; Wc-8j2M
//swap XP!7@:
SortUtil.swap(data,pivotIndex,j); y@Q?
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int k=partition(data,i-1,j,data[j]); =5Auk5&
SortUtil.swap(data,k,j); Hg;; >
if((k-i)>1) quickSort(data,i,k-1); AIa#t#8${
if((j-k)>1) quickSort(data,k+1,j); 1brKs-z
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} (qXl=e8
/** &C7HG^;W9
* @param data b9@VD)J0E
* @param i sz+Uq]Mn
* @param j VyL|d^'f_
* @return J?N9*ap)
*/ QHuh=7u)
private int partition(int[] data, int l, int r,int pivot) { E?Ofkc$q
do{
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while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r);
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} w_eUU)z
while(l SortUtil.swap(data,l,r); o|0QstSCl
return l; 9F"Q2^l'
} `OmYz{*r
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} 4\%XC
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改进后的快速排序: :Y ;\1J<b1
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package org.rut.util.algorithm.support; M,b^W:('4
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import org.rut.util.algorithm.SortUtil; [r5k8TB1
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/** *X4$'LSx1
* @author treeroot |]9Z#lv+I
* @since 2006-2-2 YKsc[~
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* @version 1.0 &,B91H*#
*/ Vz,2_QJ
public class ImprovedQuickSort implements SortUtil.Sort { hu+% X.F4
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private static int MAX_STACK_SIZE=4096; 15 ^5yRXC
private static int THRESHOLD=10; CAD:ifV
/* (non-Javadoc) 19t'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {b6g!sE
*/ ep3iI77/
public void sort(int[] data) { /4Lmu+G4
int[] stack=new int[MAX_STACK_SIZE]; {Qla4U
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int top=-1; E@F:U*A6%
int pivot; xz$S5tgDQK
int pivotIndex,l,r; @0>3))
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stack[++top]=0; {?dW-
stack[++top]=data.length-1; N%.DjH
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while(top>0){ [d_sd
int j=stack[top--]; zsx12b^w
int i=stack[top--]; WrGz`
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pivotIndex=(i+j)/2; br9`77J8
pivot=data[pivotIndex]; >O{/%(9
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SortUtil.swap(data,pivotIndex,j); $ (gR^L
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//partition D<