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快速排序: !oyo_h
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package org.rut.util.algorithm.support; v7(7WfqP
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import org.rut.util.algorithm.SortUtil; ]]p\1G
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/** S$b)X"h
* @author treeroot 8*-)[+s9il
* @since 2006-2-2 ,Ee5}#dI
* @version 1.0 DT-.Gdb8
*/ V_3oAu54s{
public class QuickSort implements SortUtil.Sort{ [FhYQI
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/* (non-Javadoc) |k~AGc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [>NMuwtG
*/ %Za}q]?
public void sort(int[] data) { IYn`&jS{
quickSort(data,0,data.length-1); )B]"""J
} wXQu%F3
private void quickSort(int[] data,int i,int j){ ~2*LWH*@
int pivotIndex=(i+j)/2; ]{=y8]7
//swap -gGw_w?)(
SortUtil.swap(data,pivotIndex,j); M2%@bETJ
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int k=partition(data,i-1,j,data[j]); =*fq5v
SortUtil.swap(data,k,j); #GGa, @O
if((k-i)>1) quickSort(data,i,k-1); xn, u$@F
if((j-k)>1) quickSort(data,k+1,j); <?A4/18K
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} <^nS%hXEr
/** Q7y'0s
* @param data '$,yV f
* @param i NioqJG?p
* @param j h`U-{VIrqi
* @return 7bYwh8
*/ R\cx-h*
private int partition(int[] data, int l, int r,int pivot) { TJYhgna
do{ e,Cc.T\o
while(data[++l] while((r!=0)&&data[--r]>pivot); 8`S1E0s
SortUtil.swap(data,l,r); W9l](Ow
} ;tQc{8O6L
while(l SortUtil.swap(data,l,r); <IWg]AJT:
return l; C6c*y\O\7
} r?)1)?JnHe
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} #;99vwc
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改进后的快速排序: F7'MoH
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package org.rut.util.algorithm.support; f5//?ek
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import org.rut.util.algorithm.SortUtil; j f4<LmR
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/** 2RZa}
* @author treeroot wMkHx3XD
* @since 2006-2-2 V|A)f@ Fs
* @version 1.0 I3
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*/ 5ppr;QaB
public class ImprovedQuickSort implements SortUtil.Sort { ,i6U*
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private static int MAX_STACK_SIZE=4096; @@@}FV&
private static int THRESHOLD=10; !{,2uQXe
/* (non-Javadoc) >Ec;6V
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?9xWTVa8
*/ Lp%J:ogV`
public void sort(int[] data) { (6/aHSXI
int[] stack=new int[MAX_STACK_SIZE]; V9/2y9u
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int top=-1; ~NE`Ad.G
int pivot; 6
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int pivotIndex,l,r; ;a|%W4 "
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stack[++top]=0; `Cd!
stack[++top]=data.length-1; )
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while(top>0){ }!xc@
int j=stack[top--]; MMO/vJC
int i=stack[top--]; WUauKRR.
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pivotIndex=(i+j)/2; xjD$i'V+
pivot=data[pivotIndex]; K:e[#b8:R
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SortUtil.swap(data,pivotIndex,j); 5(2 C
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//partition tVf):}<h
l=i-1; Vk`Uz1*
r=j; 'uzHI@i
do{ 9e.v[K~
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 43g1/,klm
SortUtil.swap(data,l,r); 9b6U]z,
} mph9/ %]S
while(l SortUtil.swap(data,l,r); s/t,6-~EH
SortUtil.swap(data,l,j); zk1]?
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if((l-i)>THRESHOLD){ \0Xq&CG=E
stack[++top]=i; #'@@P6o5
stack[++top]=l-1; 2f{p$YIt
} ]w,|WZm
if((j-l)>THRESHOLD){ vH}VieU
stack[++top]=l+1; 5GPrZY"
stack[++top]=j; 6Ik
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} hVyeHbx
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} ltrti.&
//new InsertSort().sort(data); w_"-rGV
insertSort(data); uzb|yV'B
} } PL{i
/** :RDk{^b)
* @param data Ya~Th)'>q
*/ 45BpZ~-
private void insertSort(int[] data) { GB Vqc!d
int temp; 3QXsr<
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); @:Ft+*2
} A:4&XRYZY
} ?ecR9X k
} ~("bpS#ZgD
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} ,+Ocb-*
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