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快速排序: wVp
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package org.rut.util.algorithm.support; :dB6/@fW
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import org.rut.util.algorithm.SortUtil; V,lz}&3L
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/** $+-2/=>Xk
* @author treeroot >8EIm
* @since 2006-2-2 yw2sK7
* @version 1.0 Yf<6[(6 O
*/ @*!8
public class QuickSort implements SortUtil.Sort{ ?oP<sGp
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/* (non-Javadoc) KYMz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U#-89.x
*/ #pLd';
public void sort(int[] data) { =lA*?'kd
quickSort(data,0,data.length-1); H:2#/1Oz>
} LLCMp3qBz
private void quickSort(int[] data,int i,int j){ Eufw1vDa
int pivotIndex=(i+j)/2; u0\?aeg`
//swap 8eQ 4[wJY
SortUtil.swap(data,pivotIndex,j); jo/-'Lf{?
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int k=partition(data,i-1,j,data[j]); ~^
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SortUtil.swap(data,k,j); !5&%
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if((k-i)>1) quickSort(data,i,k-1); hj s[$,1
if((j-k)>1) quickSort(data,k+1,j); n YWS'i@
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} Qn6'E
/** i#=s_v8
* @param data O6 bB CF;
* @param i |cUTP!iy
* @param j N"@aisi)
* @return 7ZqC1
*/ Ar,B7-F!
private int partition(int[] data, int l, int r,int pivot) { !-)Hog5\
do{ 9+_SG/@
while(data[++l] while((r!=0)&&data[--r]>pivot); -ich N/U]s
SortUtil.swap(data,l,r); v?vm-e
} DavpjwSn
while(l SortUtil.swap(data,l,r); :[A>O(
return l; )w=ehjV^m
} *\L\Bzm
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} ?%d]iTZE
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改进后的快速排序: OLg=kF[[
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package org.rut.util.algorithm.support; \ ?sM
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import org.rut.util.algorithm.SortUtil; n j0!
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/** ^Q0%_V,
* @author treeroot \("|X>00
* @since 2006-2-2 &>,c..Ke
* @version 1.0 Ahv %Q%m%2
*/ !#xk?L yB
public class ImprovedQuickSort implements SortUtil.Sort { Q+YYj
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private static int MAX_STACK_SIZE=4096; nJC/yS|
private static int THRESHOLD=10; A0~uv4MC
/* (non-Javadoc) u?,M`w0'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OTwIR<_B+
*/ lXso@TNrZ0
public void sort(int[] data) { V $Y=JK@
int[] stack=new int[MAX_STACK_SIZE]; <#HQU<
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int top=-1; VI_8r5o
int pivot; }04EM
int pivotIndex,l,r; }g&A=u_2
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stack[++top]=0; Jvac|rN
stack[++top]=data.length-1; X"lPXoCN
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while(top>0){ ,sF49CD
int j=stack[top--]; l=4lhFG,Mk
int i=stack[top--]; qD!qSM
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pivotIndex=(i+j)/2; O1xK\ogv
pivot=data[pivotIndex]; Ww\M3Q`h
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SortUtil.swap(data,pivotIndex,j); \7]0vG
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//partition jAXKp
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l=i-1; J;8M._
r=j; KUD&vqx3
do{ C^QpVt-T
while(data[++l] while((r!=0)&&(data[--r]>pivot)); v%^"N_]
SortUtil.swap(data,l,r); dA03,s
} lW6$v*
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while(l SortUtil.swap(data,l,r); 8U86-'Pq
SortUtil.swap(data,l,j); wjEyU:
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if((l-i)>THRESHOLD){ rHngYcjR
stack[++top]=i; Q> d<4]`
stack[++top]=l-1;
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} eICavp
if((j-l)>THRESHOLD){ z.Y`"B'j`
stack[++top]=l+1; {mO QRAKl
stack[++top]=j; w{+G/Ea
} }aSTo"~m#
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} [a201I0 -
//new InsertSort().sort(data); o|`%>&jP
insertSort(data); {wJ8%
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} +PAb+E|,
/** {#U3A_y
* @param data W!jg
*/ t nvCtuaR
private void insertSort(int[] data) { e)BU6m%
int temp; ~S\y)l\wZ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6> DmcG:.
} 2UbTKN
} M1HGXdN* B
} "Sb<"$:
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} Lqa|9|!
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