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快速排序: LT!4pD:a
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package org.rut.util.algorithm.support; &q+ %OPV
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import org.rut.util.algorithm.SortUtil; P`0aU3pl
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/** 4CqZvdC
* @author treeroot 3ul
* @since 2006-2-2 {^v50d
* @version 1.0 ^H>vJT
*/ {k>m5L
public class QuickSort implements SortUtil.Sort{ ;J<kG@
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/* (non-Javadoc) :
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f3O3pIA
*/ K>-m8.~\E
public void sort(int[] data) { J_tJj8
quickSort(data,0,data.length-1); _ h#G-
} 'RhMzPmY>
private void quickSort(int[] data,int i,int j){ n*V^Qf
int pivotIndex=(i+j)/2; 7 @ZL(G
//swap /3fo=7G6
SortUtil.swap(data,pivotIndex,j); *E>YLkg]
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int k=partition(data,i-1,j,data[j]); =i.[|g"
SortUtil.swap(data,k,j); GlaWBF#
if((k-i)>1) quickSort(data,i,k-1); '#XP:nqFkK
if((j-k)>1) quickSort(data,k+1,j); &*0V!+#6
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} F4@h}T5)
/** ][9M_.
* @param data nt4> 9;
* @param i +IU]=qS
* @param j $`i&\O2*
* @return @$aCUJ/mE
*/ BZE19!
private int partition(int[] data, int l, int r,int pivot) { NLj0\Pz|B
do{ Z#0z #M`
while(data[++l] while((r!=0)&&data[--r]>pivot); 15870xS
SortUtil.swap(data,l,r); 'tOo0Zgc
} Pai{?<zGi
while(l SortUtil.swap(data,l,r); VF4F7'
return l; ks!
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} tTY (I1
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} 4&?%" 2
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改进后的快速排序: ]wP)!UZ
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package org.rut.util.algorithm.support; >_R5Li
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import org.rut.util.algorithm.SortUtil; '&\km~&
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/** Lz4iLLP
* @author treeroot R+5x:mpHy
* @since 2006-2-2 ]3%Z
* @version 1.0 =U?"#
*/ K,J:i^2
public class ImprovedQuickSort implements SortUtil.Sort {
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private static int MAX_STACK_SIZE=4096; P
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private static int THRESHOLD=10; RS$e^_ W
/* (non-Javadoc) KktQA*G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) idV4hMF9
*/ sb;81?|
public void sort(int[] data) { f9!wO';P6
int[] stack=new int[MAX_STACK_SIZE]; *@/!h2
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int top=-1; !Y5O3^I=u
int pivot; (CEJg|,
int pivotIndex,l,r; I'C{=?
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stack[++top]=0; &K}!R$[,:P
stack[++top]=data.length-1; zK33.HY
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while(top>0){ TfMuQ i'>
int j=stack[top--]; .'
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int i=stack[top--]; KyDQ<Dq&
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pivotIndex=(i+j)/2; r..\(r
pivot=data[pivotIndex]; 0,,x|g$TpT
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SortUtil.swap(data,pivotIndex,j); 2rne=L
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//partition ze]2-B4
l=i-1; P#6y
r=j; 0F)Y[{h<
do{ Qb6s]QZEV
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ,xNuc$8Jd
SortUtil.swap(data,l,r); p1CY?K
} ?DA,]aa-
while(l SortUtil.swap(data,l,r); ZY=x$($f
SortUtil.swap(data,l,j); UT+B*?,h
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if((l-i)>THRESHOLD){
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stack[++top]=i; kE=}.
stack[++top]=l-1; ^b'|`R+~}
} we!}"'E;
if((j-l)>THRESHOLD){ R9~%ORI#;
stack[++top]=l+1; ?HttqK)
stack[++top]=j; JZ'`.yK:
} MJb!+E+
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} RD<l<+C^~
//new InsertSort().sort(data); UuW"
insertSort(data); Ydh]EO0'
} 36e!je
/** hQvSh\p
* @param data l$z\8]x
*/ ggfL
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private void insertSort(int[] data) { _da>=^hFJ
int temp; Kr!8H/Z
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Xh;Pbm|K
} t(}\D]mj
} R6*:Us0\FJ
} Pqi>,c<&mL
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} rXdI`l#
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