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快速排序: 0IBQE
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package org.rut.util.algorithm.support; S WyJ`
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import org.rut.util.algorithm.SortUtil; ~(:0&w%e
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/**
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* @author treeroot /[n]t
* @since 2006-2-2 r~2q`l'>
* @version 1.0 {Q@?CT
*/ x{/-&`F
public class QuickSort implements SortUtil.Sort{ Vt:\llsin
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/* (non-Javadoc) mE&SAm5#d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +Eel|)Z*Q
*/ G2b"R{i/,
public void sort(int[] data) { Bm<tCN-4
quickSort(data,0,data.length-1); q_[`PYT
} \S{ihS@J
private void quickSort(int[] data,int i,int j){ {Z178sik
int pivotIndex=(i+j)/2; d<E2=WVB6
//swap U~dqxR"Q
SortUtil.swap(data,pivotIndex,j); WC
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int k=partition(data,i-1,j,data[j]); z0F55<i
SortUtil.swap(data,k,j); (0rcLNk{|
if((k-i)>1) quickSort(data,i,k-1); Bj\Us$cZ
if((j-k)>1) quickSort(data,k+1,j);
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} '$5d6?BC`3
/** }g:'K
* @param data XXeDOrb
* @param i v9(N}hoP
* @param j ,uO_C(G/i
* @return MPYYTQ1FB
*/ _xnJfW_
private int partition(int[] data, int l, int r,int pivot) { >ul&x!?@
do{ !(3[z>
while(data[++l] while((r!=0)&&data[--r]>pivot); rje;Bf
SortUtil.swap(data,l,r); lA`-"
} dTte4lh
while(l SortUtil.swap(data,l,r); =5uhIU0O
return l; LLMGs: [
} 6z'0fi|EN
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} Y@qugQM>
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改进后的快速排序: LxiN9
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package org.rut.util.algorithm.support; J?tnS6V
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import org.rut.util.algorithm.SortUtil; k0TQFx.A
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/** fd62m]X
* @author treeroot "Nz"|-3Irv
* @since 2006-2-2 Yq:/dpA_
* @version 1.0 e-.(O8
*/ x@:98P
public class ImprovedQuickSort implements SortUtil.Sort { 8cRc5X
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private static int MAX_STACK_SIZE=4096; jwI1 I {x
private static int THRESHOLD=10; -O?A"
/* (non-Javadoc) p:ZQ*Ue
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A5[kYD,_
*/ lLK||2d
public void sort(int[] data) { Bgai|l
int[] stack=new int[MAX_STACK_SIZE]; OC\cN%qlw
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int top=-1; SCfk!GBVD
int pivot; ETR7%0$r
int pivotIndex,l,r; ?zVcP=p@
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stack[++top]=0; >4HB~9dKU
stack[++top]=data.length-1; [FBc&HN
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while(top>0){ #W8c)gkG9
int j=stack[top--]; YF %]%^n
int i=stack[top--]; nhd.c2t\
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pivotIndex=(i+j)/2; ZvK3Su)f1
pivot=data[pivotIndex]; E;"VI2F
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SortUtil.swap(data,pivotIndex,j); 5r;)Ppo
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//partition @9k3}x K
l=i-1; h,K&R8S
r=j; pTJ_DH
do{ )5Cqyp~P
while(data[++l] while((r!=0)&&(data[--r]>pivot)); >z,Y%A
SortUtil.swap(data,l,r); R1.Yx?
} 8-smL^~%#
while(l SortUtil.swap(data,l,r); y;O
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SortUtil.swap(data,l,j); n"R$b:
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if((l-i)>THRESHOLD){ h,]lN'JG{
stack[++top]=i; =YtK@+| i
stack[++top]=l-1; a(h@4 x
} ':utU1dL
if((j-l)>THRESHOLD){ +RK/u
stack[++top]=l+1; F(,SnSam
stack[++top]=j; xx?0Ftuq
} e`5:46k|
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} -ilhC Y@M
//new InsertSort().sort(data); vJW`aN1<I3
insertSort(data); 7mb5z/N
} m
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