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快速排序: dx]>(e@(t{
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package org.rut.util.algorithm.support; q4q6c")zp
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import org.rut.util.algorithm.SortUtil; c,22*.V/
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/** l%ZhA=TKQ
* @author treeroot @o^Ww
* @since 2006-2-2 ]4{H+rw
* @version 1.0 d _
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*/ wzaV;ac4K
public class QuickSort implements SortUtil.Sort{ B *vM0
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/* (non-Javadoc) 51u0]Qx;fm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'S~5"6r
*/ O f#:
public void sort(int[] data) { Qd6F H2Pl
quickSort(data,0,data.length-1); %SI'BJ
} d3Rw!slIq
private void quickSort(int[] data,int i,int j){ "3hMq1NQ`g
int pivotIndex=(i+j)/2; ] - .aL
//swap }Lv;!
SortUtil.swap(data,pivotIndex,j); 8Y3I0S
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int k=partition(data,i-1,j,data[j]); S$3JMFA
SortUtil.swap(data,k,j); fh{`Mz,o
if((k-i)>1) quickSort(data,i,k-1); 1cGmg1U;
if((j-k)>1) quickSort(data,k+1,j); 7KPwQ?SjT
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} ccnK#fn v
/** oE~RySX
* @param data uMv1O{
* @param i .o8t+X'G
* @param j @KA4N`
* @return H[UlY?&+
*/ [2koe.?(
private int partition(int[] data, int l, int r,int pivot) { !+ njS
do{ `kr?j:g
while(data[++l] while((r!=0)&&data[--r]>pivot); &?vgP!d&M
SortUtil.swap(data,l,r); P_dJZ((X
} TKjFp%
while(l SortUtil.swap(data,l,r); ?8 {"x8W;
return l; {|\.i
} h1{3njdr
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} KU;9}!#
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改进后的快速排序: _rYkis^u
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package org.rut.util.algorithm.support; mqJ_W[y7
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import org.rut.util.algorithm.SortUtil; 1U\z5$V
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/** Jo}eeJ;k
* @author treeroot QM]YJr3rE
* @since 2006-2-2 e|9A716x
* @version 1.0 Z6pUZ[j,
*/ .~}1+\~5
public class ImprovedQuickSort implements SortUtil.Sort { EzIGz[
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private static int MAX_STACK_SIZE=4096; qFNes)_r
private static int THRESHOLD=10; s@DLt+ O5
/* (non-Javadoc) 3,=6@U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %IRi1EmN8
*/ H.2QKws^F
public void sort(int[] data) { |I|fMF2K
int[] stack=new int[MAX_STACK_SIZE]; EIQ
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int top=-1; EZj9wd"u
int pivot; ]fD}
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int pivotIndex,l,r; f
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stack[++top]=0; +{UcspqM
stack[++top]=data.length-1; o lxByzTh>
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while(top>0){ +]50D xflA
int j=stack[top--]; `p7=t)5k
int i=stack[top--]; 'ah[(F<*@e
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pivotIndex=(i+j)/2; m9A!D
pivot=data[pivotIndex]; H4JTGt1"
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SortUtil.swap(data,pivotIndex,j); F:l%O#V
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//partition e!r-+.i(
l=i-1; "}JZU!?
r=j; ^BL"wk
do{ ~!3r&(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); e,5C8Q`Z
SortUtil.swap(data,l,r); o+9j?|M
} e*n@j
while(l SortUtil.swap(data,l,r); orvp*F{7[H
SortUtil.swap(data,l,j); Y5d \d\e/
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if((l-i)>THRESHOLD){ GDy9qUV
stack[++top]=i; X~i<g?]
stack[++top]=l-1;
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} [66!bM&
if((j-l)>THRESHOLD){ 0<B$#8
stack[++top]=l+1; C{bgkzr
stack[++top]=j; F*K_+
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} HX{`VahE
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} 2,P^n4~A?w
//new InsertSort().sort(data); K!]/(V(}
insertSort(data); !7&5` q7
} 3 SGDy]
/** "2T#MO/
* @param data I15{)o(8$
*/ Y7[jqb1D
private void insertSort(int[] data) { FjI`uP
int temp; 4X(H;
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); {&T_sw@[
} BFJnV.0M!
} yEj^=pw
} 9pxc~=
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} :Qf '2.h)
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