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快速排序: W _PM!>8`
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package org.rut.util.algorithm.support; m NUN6qVP~
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import org.rut.util.algorithm.SortUtil; k7z(Gbzu
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/** }Q{
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* @author treeroot ?#VP)A
* @since 2006-2-2 N}8HK^n*
* @version 1.0 "Cb.cO$i;
*/ qB+:#Yrx/
public class QuickSort implements SortUtil.Sort{ ~ERRp3Ee?
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/* (non-Javadoc) DuTlYXM2^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2.HZ+1
*/ %0ll4"
public void sort(int[] data) { eZ8Y"i\!y
quickSort(data,0,data.length-1); *@\?}cX
} XPc9z}/(e
private void quickSort(int[] data,int i,int j){ *tq|x[<
int pivotIndex=(i+j)/2; pO-s@"j]
//swap eHF(,JI
SortUtil.swap(data,pivotIndex,j); R`I8Ud4=
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int k=partition(data,i-1,j,data[j]); &J5-'{U|0
SortUtil.swap(data,k,j); u7WTSL%
if((k-i)>1) quickSort(data,i,k-1); HKEop
if((j-k)>1) quickSort(data,k+1,j); k$UzBxR
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} 3/A[LL|
/** 6k@% +<1
* @param data T!=20 !I
* @param i I:uQB!
* @param j \dp9@y[^
* @return yZj}EBa
*/ ;qT!fuN;
private int partition(int[] data, int l, int r,int pivot) { (!XYH@Mz<w
do{ JR?
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while(data[++l] while((r!=0)&&data[--r]>pivot); i(&6ys5
SortUtil.swap(data,l,r); 'y+bx?3Z
} p5twL
while(l SortUtil.swap(data,l,r); NE=#5?6%g7
return l; _Cv[`e.
} *uI hxMX
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} 3zA8pI w
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改进后的快速排序: B>p0FQ.
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package org.rut.util.algorithm.support; aowPji$H
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import org.rut.util.algorithm.SortUtil; Pt PGi^
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/** 8Y{}p[UFT
* @author treeroot 0bnVIG2q
* @since 2006-2-2 C%95~\Ds
* @version 1.0 +}`O^#<qLX
*/ <QkN}+B=
public class ImprovedQuickSort implements SortUtil.Sort { V~]'+A
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private static int MAX_STACK_SIZE=4096; T
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private static int THRESHOLD=10; !F7EAQn{(
/* (non-Javadoc) 9GtVI^]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) RV#uy]
*/ )bIK0h
public void sort(int[] data) { 5uD#=/oV
int[] stack=new int[MAX_STACK_SIZE]; jnU*l\,
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int top=-1; mP5d!+[8
int pivot; Ch \ed|u
int pivotIndex,l,r; {'c%#\
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stack[++top]=0; u':0"5}
stack[++top]=data.length-1; :m)Rmwn_
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while(top>0){ ~*cY& 9
int j=stack[top--]; ]UCk_zWsn1
int i=stack[top--]; i k1L
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pivotIndex=(i+j)/2; rmg";(I
pivot=data[pivotIndex]; |S>J<]H
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SortUtil.swap(data,pivotIndex,j); ^7s6J{<
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//partition wzQdKlV
l=i-1; \}4#**]
r=j; 1n"+~N^\
do{ Og;$P'U
while(data[++l] while((r!=0)&&(data[--r]>pivot)); X_tW#`
SortUtil.swap(data,l,r); tN'- qdm
} O%++0k;
while(l SortUtil.swap(data,l,r); Pdo5sve
SortUtil.swap(data,l,j); lc$@Jjg9
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if((l-i)>THRESHOLD){ s=y9!rr
stack[++top]=i; Eip~~2
stack[++top]=l-1; sNk>0 X[
} eFXi )tl
if((j-l)>THRESHOLD){ HDW\S#
stack[++top]=l+1; 1:;&wf
stack[++top]=j; LnRi+n[@7
} vu.S>2Wv
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} X $9D0;L
//new InsertSort().sort(data); RSWB!-
insertSort(data); 48&KdbGX
} fssL'DD
/** 4KSP81}/\
* @param data I|3v&E1
*/ T\e)Czz2-
private void insertSort(int[] data) { WfjUJw5x"s
int temp; o%~K4 M".
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); kDpZnXP
} ^%*{:0'
} 73sAZa|
} @qhg[= @
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} 0&rH 9
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