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快速排序: j{Jc6U
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package org.rut.util.algorithm.support; Qwo9>ClC
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import org.rut.util.algorithm.SortUtil; #s
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/** exEld
* @author treeroot G^@Jgx3n
* @since 2006-2-2 ?WtG|w
* @version 1.0 zn;Hs]G
*/ HT=Am
public class QuickSort implements SortUtil.Sort{ Yn]yd1
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/* (non-Javadoc) ( WtE`f;Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _6S
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*/ `e'o~oSu
public void sort(int[] data) { .O%1)p
quickSort(data,0,data.length-1); CSqb)\8Oi*
} )bXx9,VL
private void quickSort(int[] data,int i,int j){ akc"}+-oX
int pivotIndex=(i+j)/2; h)l&K%4;
//swap {G1aAM\Hz
SortUtil.swap(data,pivotIndex,j); 4[CBW
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int k=partition(data,i-1,j,data[j]); n5*{hi
SortUtil.swap(data,k,j); Fp6[W5>(-
if((k-i)>1) quickSort(data,i,k-1); +'Y(V&
if((j-k)>1) quickSort(data,k+1,j); +6M+hO]
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} XvkI+c
/** 2DCcGKa"
* @param data o- QG&
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* @param i ivUsMhx>S,
* @param j !0csNg!
* @return R{xyme@"^
*/ V_A,d8=lt
private int partition(int[] data, int l, int r,int pivot) { VfA5r`^
do{ {}J@+Zsi
while(data[++l] while((r!=0)&&data[--r]>pivot); kl3S~gE4@
SortUtil.swap(data,l,r); )\D40,p
} e]*=sp!T
while(l SortUtil.swap(data,l,r); p1VahjRE-
return l; 1s}NQ3
} CX ]\Q-y
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改进后的快速排序: JfP\7
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package org.rut.util.algorithm.support; 4>"cc@8&~
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import org.rut.util.algorithm.SortUtil; p-'6_\F.Ke
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/** 'f?&EsIV?
* @author treeroot tC@zM.v%
* @since 2006-2-2 mQ^@ \s
* @version 1.0 Q(;B)
*/ OBw`!G*w
public class ImprovedQuickSort implements SortUtil.Sort { _[{:!?-?
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private static int MAX_STACK_SIZE=4096; bDFCZH-:'O
private static int THRESHOLD=10; (&P0la1
/* (non-Javadoc) 0nD=|W\@{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qv0
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*/ 'Elj"Iiu
public void sort(int[] data) { `l gjw=
int[] stack=new int[MAX_STACK_SIZE]; )_c=mT
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int top=-1; Z?~d']XD
int pivot; e:GgA
int pivotIndex,l,r; ^`jZKh8)h
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stack[++top]=0; fr'huvc
stack[++top]=data.length-1; Hr<C2p^a
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while(top>0){ io9xI3{
int j=stack[top--]; 16[-3cJ T
int i=stack[top--]; `Ge +(1x
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pivotIndex=(i+j)/2; zOiY0`=
pivot=data[pivotIndex]; /\-2l+y>J
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SortUtil.swap(data,pivotIndex,j); s7.p$r
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//partition GIRSoRVsh
l=i-1; /J[H5uA
r=j; =,AC%S_D~
do{ iO9nvM<
while(data[++l] while((r!=0)&&(data[--r]>pivot)); KYkS6|A
SortUtil.swap(data,l,r); WBw
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} I| W'n-4Y
while(l SortUtil.swap(data,l,r); :zj9%4A
SortUtil.swap(data,l,j); Xb<DpBrk
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if((l-i)>THRESHOLD){ ^)hAVf~E
stack[++top]=i; }#ep}h
stack[++top]=l-1; #j^('K|
} >9.5-5"
if((j-l)>THRESHOLD){ `s>UU- 9
stack[++top]=l+1; 4{*tn"y
stack[++top]=j; |ilv|U V
} O/DAf|X|
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} cZDxsd]
//new InsertSort().sort(data); 9RCO|J
insertSort(data); dcl.wD0~V
}
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/** /]/>jz>
* @param data (@KoqwVWc
*/ |%'6f}fnE
private void insertSort(int[] data) { "+n4 c'
int temp; w\o)bn
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +
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} d`9W
} pwFU2}I
} FpdDIa
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} kfqpI
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