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快速排序: yXL]uh#b
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package org.rut.util.algorithm.support; PV/SzfvIq
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import org.rut.util.algorithm.SortUtil; e$y VV#
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/**
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* @author treeroot aC=D_JJ\
* @since 2006-2-2 ) ]3(ue
* @version 1.0 Hm55R
*/ h` ,! p
public class QuickSort implements SortUtil.Sort{ XhxCOpO
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/* (non-Javadoc) s7}46\/U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -P|st;?#
*/ 6zJfsKf$
public void sort(int[] data) { I:G4i}mA
quickSort(data,0,data.length-1); L/n?1'he
} 2^C>orKQ0
private void quickSort(int[] data,int i,int j){ `+O7IyTMA
int pivotIndex=(i+j)/2; b{wj4
//swap %#,EqN
SortUtil.swap(data,pivotIndex,j); }0?\H)/edP
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int k=partition(data,i-1,j,data[j]); +$H`/^a.
SortUtil.swap(data,k,j); J)leRR&
if((k-i)>1) quickSort(data,i,k-1); ',P E25Z
if((j-k)>1) quickSort(data,k+1,j); &?gvW//L2
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} ]7yr.4?a
/** }Pn]j7u!
* @param data 27-GfC=7*
* @param i JM-+p
* @param j Yx{q VU
* @return (5(TbyWwD
*/ 9akIu.H
private int partition(int[] data, int l, int r,int pivot) { {`M
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do{ 0O:')R&
while(data[++l] while((r!=0)&&data[--r]>pivot); _]# ^2S
SortUtil.swap(data,l,r); y}t1r |p
} WVfwt.Y
while(l SortUtil.swap(data,l,r); H~Fb=.h]U
return l; :7-2^7z)
} xLmgr72D
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改进后的快速排序: @XL5$k[Y
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package org.rut.util.algorithm.support; n^2p jTkl
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import org.rut.util.algorithm.SortUtil; _#]/d3*Z}
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/** _pS|bqF
* @author treeroot W dNOE;R
* @since 2006-2-2 oX
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* @version 1.0 w( ^
*/ efu'PfZ`&
public class ImprovedQuickSort implements SortUtil.Sort {
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private static int MAX_STACK_SIZE=4096; nF!6
private static int THRESHOLD=10; bYKe5y=
/* (non-Javadoc) n$oHr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .!pr0/9B
*/ ecRY,MN
public void sort(int[] data) { #{BHH;J+
int[] stack=new int[MAX_STACK_SIZE]; J>XMaI})U
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int top=-1; %2jRJ
int pivot; *lT: P-
int pivotIndex,l,r; }; ;Thfd
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stack[++top]=0; yHk}'YP
stack[++top]=data.length-1; \6)]!$F6:
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while(top>0){ lEWF~L5=:
int j=stack[top--]; t/57LjV
int i=stack[top--]; }pMd/|A,
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pivotIndex=(i+j)/2; |r%NMw #y
pivot=data[pivotIndex]; t0*,%ge:<
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SortUtil.swap(data,pivotIndex,j); +-*Ww5Zti
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//partition >{HQ"{Q
l=i-1; 8*iIJ
r=j; UTLuzm
do{ &x YO6_.
while(data[++l] while((r!=0)&&(data[--r]>pivot)); #NZ#G~oeO
SortUtil.swap(data,l,r); (rfR:[JkC2
} p?v. 42R:z
while(l SortUtil.swap(data,l,r); O;dtz\
SortUtil.swap(data,l,j); 'fIoN%
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if((l-i)>THRESHOLD){ s9)U",
stack[++top]=i; (/a#1Pd&
stack[++top]=l-1; ZZu{ct9
} :+qd>;yf#
if((j-l)>THRESHOLD){ 7H l>UX,|
stack[++top]=l+1;
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stack[++top]=j; U7do,jCoa
} hRwj-N%C
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} l3O!{&~K
//new InsertSort().sort(data); {)?:d6"
insertSort(data); 9k.5'#
} };Oyv7D+b
/** z*FCd6X
* @param data aJ/}ID
*/ =}D9sT
private void insertSort(int[] data) { y2{uEbA
int temp; !jTtMx
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); "!w#E6gU
} e"D%eFkDW
} N|@jHxy
} Pb`Uxv
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} 6D&{+;
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