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快速排序: ,f@\Fs~n
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package org.rut.util.algorithm.support; dW5@Z-9
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import org.rut.util.algorithm.SortUtil; &cp
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/** <kCOg8<y
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* @author treeroot *S<d`mp[
* @since 2006-2-2 "wR1=&gk
* @version 1.0 .<zN/&MXf
*/ WYN0,rv1:+
public class QuickSort implements SortUtil.Sort{ XW.k%H4@
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/* (non-Javadoc) a@S{A5j
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) dK Qu
*/ 3;JF5e\?x
public void sort(int[] data) { TE9Iyl|=
quickSort(data,0,data.length-1); tc0(G~.N
} M?_7*o]!
private void quickSort(int[] data,int i,int j){ >{)\GK0i7
int pivotIndex=(i+j)/2; w
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//swap wEF"'T
SortUtil.swap(data,pivotIndex,j); K!,9qH
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int k=partition(data,i-1,j,data[j]); eiQ42x@Z
SortUtil.swap(data,k,j); D(WdI
if((k-i)>1) quickSort(data,i,k-1); H+
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if((j-k)>1) quickSort(data,k+1,j); x=03WQ8
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} " ?Ux\)*
/** . {vMn0c
* @param data if?X^j0
* @param i tlM >=s'T
* @param j |'``pq/}_
* @return \UP=pT@
*/ \S_Ae;
private int partition(int[] data, int l, int r,int pivot) { *nK4XgD
do{ [Z2{S-)UM
while(data[++l] while((r!=0)&&data[--r]>pivot); Zu*7t<W
SortUtil.swap(data,l,r); )3WUyD*UZN
} C/4r3A/u
while(l SortUtil.swap(data,l,r); "A*;V
return l; PXG@]$~3
} {oS/Xa
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} K 6yD64
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改进后的快速排序: ?OPuv5!pI
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package org.rut.util.algorithm.support; "=ki_1/P
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import org.rut.util.algorithm.SortUtil; <J>k%,:B
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/** >@h#'[z,d
* @author treeroot xSqr=^
* @since 2006-2-2 )5`~WzA
* @version 1.0 K^h9\<w
*/ AV4fN@BX
public class ImprovedQuickSort implements SortUtil.Sort { OrF.wcg
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private static int MAX_STACK_SIZE=4096; /'zXb_R,$
private static int THRESHOLD=10; PI@?I&Bo
/* (non-Javadoc) xLb=^Xjec
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l$kO%E'
*/ P+y XC^ ,
public void sort(int[] data) { zf]e"e
int[] stack=new int[MAX_STACK_SIZE]; \=P(?!v
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int top=-1; i&p6UU
int pivot; ~Q#!oh'i
int pivotIndex,l,r; upaQoX/C
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stack[++top]=0; N]14~r=
stack[++top]=data.length-1; r,3\32[?
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while(top>0){ )*R';/zaI
int j=stack[top--]; ]jPP]Z:y
int i=stack[top--]; (74y2U6
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pivotIndex=(i+j)/2; Pd& Npp3
pivot=data[pivotIndex]; +sTPTCLE
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SortUtil.swap(data,pivotIndex,j); I;1)a4Xc4R
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//partition Vugb;5Vl
l=i-1; s|:1z"q
r=j; @v:Eh
do{ ,t;US.s([.
while(data[++l] while((r!=0)&&(data[--r]>pivot)); @ULWVS#t2
SortUtil.swap(data,l,r); SjY|aW+wAL
} R# .H&#
while(l SortUtil.swap(data,l,r); FzP1b_i
SortUtil.swap(data,l,j);
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if((l-i)>THRESHOLD){ .)Pul|)d
stack[++top]=i; nz'6^D7`r
stack[++top]=l-1; Hq,@j{($
} wr=KAsH<
if((j-l)>THRESHOLD){ }~NXiUe
stack[++top]=l+1; ~)`\j
stack[++top]=j; Pa+_{9
} _ WPt
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} z]C=nXbk
//new InsertSort().sort(data); 1
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insertSort(data); L,
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} <%`Rku
/** ij~-
* @param data 9$U4x|n
*/ : vx<m_
private void insertSort(int[] data) { RLL%l
int temp; e=s85!
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); (i1x<
} R".$x{{
} /Hq
} fH?A.JP=a
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} ,6pGKCUU:y
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