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快速排序: 02,.UqCz
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package org.rut.util.algorithm.support; e@/' o/
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import org.rut.util.algorithm.SortUtil; A5]yC\*zt
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/** ,)aUp4*
* @author treeroot koE]\B2A6
* @since 2006-2-2 d>Nh<PqH6
* @version 1.0 ^&$86-PB/
*/ Tks"GlE*D
public class QuickSort implements SortUtil.Sort{ '$J M2 u
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/* (non-Javadoc) hTcU
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7r.~L
*/ Ttp%U8-LJR
public void sort(int[] data) { /-WmOn*
quickSort(data,0,data.length-1); 4gUx#_AaG
} @D `j
private void quickSort(int[] data,int i,int j){ H<P d&
int pivotIndex=(i+j)/2; hb
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//swap y9=<q%Kc-
SortUtil.swap(data,pivotIndex,j); K8_\U0 K
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int k=partition(data,i-1,j,data[j]); Gvvw:]WgF
SortUtil.swap(data,k,j); ,|,kU0xXz
if((k-i)>1) quickSort(data,i,k-1); ^L8:..+:
if((j-k)>1) quickSort(data,k+1,j); `U>2H4P
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} v"o@q2f_
/** k2PK4Ua_}q
* @param data Z)@[N
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* @param i >ffC?5+
* @param j L=M'QJl9
* @return U;"J8
*/
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private int partition(int[] data, int l, int r,int pivot) { ]^i^L
do{ ]9JH.fF
while(data[++l] while((r!=0)&&data[--r]>pivot); BNFYUcVP
SortUtil.swap(data,l,r); S_RP&+!7
} |Q";a:&$
while(l SortUtil.swap(data,l,r); ,e'"SVQc
return l;
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} >J_P[v
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} ta
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改进后的快速排序: #^$_3AY
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package org.rut.util.algorithm.support; =qL^#h83y
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import org.rut.util.algorithm.SortUtil; ?FV%e
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/** "pH;0[r]
* @author treeroot '
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* @since 2006-2-2 v\?l+-A?y
* @version 1.0 ;cp||uO
*/ 6K=}n] n
public class ImprovedQuickSort implements SortUtil.Sort { D]|{xK C}
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private static int MAX_STACK_SIZE=4096; UFUEY/q
private static int THRESHOLD=10; NLxR6O4}8
/* (non-Javadoc) -%{+\x2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9U=6l]Np
*/ =A$d)&
public void sort(int[] data) { cR*~JwC:
int[] stack=new int[MAX_STACK_SIZE]; AEElaq.B
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int top=-1; ]#G1
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int pivot; 0[N1SY\lj
int pivotIndex,l,r; LB}J7yEQvj
[
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stack[++top]=0; ,Tk53 "
stack[++top]=data.length-1; zqZ/z>Gf
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while(top>0){ {eQijW2Z3
int j=stack[top--]; lQm7`+
int i=stack[top--]; 8LXK3D}?3
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pivotIndex=(i+j)/2; ?U1Nm~'UZ
pivot=data[pivotIndex]; :hR^?{9Z4>
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SortUtil.swap(data,pivotIndex,j); JLjs`oqh
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//partition -9o7a_Z
l=i-1; +RkXe;q
r=j; K,*-Y)v2W
do{ .NxskXq)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); WORRF
SortUtil.swap(data,l,r); Pj{I}4P`
} u),.q7(m
while(l SortUtil.swap(data,l,r); 5l%g3F
SortUtil.swap(data,l,j); }Gx@1)??
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if((l-i)>THRESHOLD){ N%e^2O)
stack[++top]=i; ]&P 4QT)f
stack[++top]=l-1; *Ue#Sade
} 2:e7'}\D.
if((j-l)>THRESHOLD){ b' ~WS4xlD
stack[++top]=l+1; .0;\cv4}
stack[++top]=j; eYUq0~3
} Dqd2e&a\
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} q]SH'Wd
//new InsertSort().sort(data); Z$6B}cz<
insertSort(data); ];N/KHeZ
} E]^n\bE%
/** LZE9]Gd
* @param data jJ,y+o
*/ U:[CcN/~3
private void insertSort(int[] data) { 9JJ6$cLF
int temp; fRkx ^u
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6k<3,`VV|
} x;LO{S4Z
} :
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} Wc;N;K52
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