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快速排序: `<``8
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package org.rut.util.algorithm.support; \r;#g{
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import org.rut.util.algorithm.SortUtil; @Owb?(6?
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/** =x%dNf$e{W
* @author treeroot q8X feoUV
* @since 2006-2-2 :1cV;gJ
* @version 1.0 \\PjKAsh
*/ [-65PC4aN
public class QuickSort implements SortUtil.Sort{ 5,3'=mA6
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/* (non-Javadoc) 5gH1.7i b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FOv=!'So
*/ 9oRy)_5Z(=
public void sort(int[] data) { _X^1IaL
quickSort(data,0,data.length-1); fM]+SMZy
} UldXYtGe
private void quickSort(int[] data,int i,int j){ 'DY`jVwa
int pivotIndex=(i+j)/2; ;,C)!c&
//swap v~f HYa>
SortUtil.swap(data,pivotIndex,j); s1MErd
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int k=partition(data,i-1,j,data[j]); Sz%tJD..
SortUtil.swap(data,k,j); ?Nup1!D
if((k-i)>1) quickSort(data,i,k-1); N|8P)
if((j-k)>1) quickSort(data,k+1,j); 6*PYFf`
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} AsQ)q
/** +DW~BS3
* @param data 8UXjm_B^'
* @param i {'XggI%
* @param j G! ]k#.^A,
* @return m;H.#^b*
*/ (_niMQtF}
private int partition(int[] data, int l, int r,int pivot) { |8&,b`Gfo
do{ zcel|oz)
while(data[++l] while((r!=0)&&data[--r]>pivot); Y'c>:;JEe
SortUtil.swap(data,l,r); HKU~UTRnZ
} sNj)ZWgd>
while(l SortUtil.swap(data,l,r); Uddr~2%(
return l; 1{r3#MVL
} Hc!
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改进后的快速排序: Keuf9u
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package org.rut.util.algorithm.support; R{WE\T '
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import org.rut.util.algorithm.SortUtil; '{a/2
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/** A'j;\
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* @author treeroot I
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* @since 2006-2-2 9)y/:sO<P
* @version 1.0 qmnZAk
*/ QP@%(]f G
public class ImprovedQuickSort implements SortUtil.Sort { K-e9>fmB#
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private static int MAX_STACK_SIZE=4096; 1QqYQafA
private static int THRESHOLD=10; ZRv*!n(Ug<
/* (non-Javadoc) ?i)f^O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0)%YNaskj
*/ [OjF[1I)u
public void sort(int[] data) { Ao&\E cIOT
int[] stack=new int[MAX_STACK_SIZE]; m#8m] Y
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int top=-1; JIOh#VNU
int pivot; $"`- ^
int pivotIndex,l,r; Ot:CPm@
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stack[++top]=0; BHd&yIyI
stack[++top]=data.length-1; Jpj}@,
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while(top>0){ K)-U1JE7
int j=stack[top--]; &Flglj~7l
int i=stack[top--]; vbkI^+=,YY
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pivotIndex=(i+j)/2; kUq=5Y `D
pivot=data[pivotIndex]; LG-y]4a}
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SortUtil.swap(data,pivotIndex,j); aY3^C q(r
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//partition .EpV;xq}
l=i-1; {SwQ[$k=_
r=j; #?5 (o
do{ 3Th'p aMG
while(data[++l] while((r!=0)&&(data[--r]>pivot)); A&s:\3*Kh
SortUtil.swap(data,l,r); l-K9LTd
} ykv94i?Q
while(l SortUtil.swap(data,l,r); `o<'
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SortUtil.swap(data,l,j); >QA uEM
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if((l-i)>THRESHOLD){ :Nu^
stack[++top]=i; wyp|qIS;
stack[++top]=l-1; h lkn%
} zEs>b(5u
if((j-l)>THRESHOLD){ Nqw&< x+
stack[++top]=l+1; =Qh\D
stack[++top]=j; X'%E\/~u
} 7+]=-
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} kspTp>~
//new InsertSort().sort(data); .}'qUPNR
insertSort(data); e"/;7:J5\
} 0QPH}Vi5}
/** y|CP;:f;
* @param data W4[V}s5u
*/ j]*j}%hz
private void insertSort(int[] data) { 7G.#O}).b
int temp; KiI!frm1
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +# GQ,
} q2. XoCf
} cU ?0(z7
} mu?Eco`~
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} ,
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