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快速排序: Q8y|:tb$Y
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package org.rut.util.algorithm.support; h>:RCpC
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import org.rut.util.algorithm.SortUtil; s? k[_|)!
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/** &J$5+"/;X
* @author treeroot Wi^rnr'Ss
* @since 2006-2-2 I?>T"nV +'
* @version 1.0 )\vHIXnfJ1
*/ Wg^cj:&`u
public class QuickSort implements SortUtil.Sort{ )/"7$2Aoy
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/* (non-Javadoc) x[UO1% _o-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <q2nZI^
*/ <R>z;2c
public void sort(int[] data) { 070IBAk}_
quickSort(data,0,data.length-1); z :v, Vu
} vLv@ Mo
private void quickSort(int[] data,int i,int j){ Cg pT(E\E
int pivotIndex=(i+j)/2; m7vxzC*
//swap 'hO;sL
SortUtil.swap(data,pivotIndex,j); &Fjilx'k
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int k=partition(data,i-1,j,data[j]); aa8Qslm
SortUtil.swap(data,k,j); bK\WdG\;
if((k-i)>1) quickSort(data,i,k-1); b6&NzUt34V
if((j-k)>1) quickSort(data,k+1,j); !"%sp6Wc
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} o'/C$E4W
/** ;bZ*6-\!-
* @param data 1Uk~m
* @param i JyC&L6[]Z
* @param j ?3TV:fx"X
* @return ?VQLY=?
*/ ?i2Wst
private int partition(int[] data, int l, int r,int pivot) { wg<|@z5
do{ m,C,<I|'d
while(data[++l] while((r!=0)&&data[--r]>pivot); E5G"QnxR>N
SortUtil.swap(data,l,r); vUe
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} FK# E7
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while(l SortUtil.swap(data,l,r); H~ n~5 sF"
return l; D1 ~x
} aGb.
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} ([b!$o<v
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改进后的快速排序: #Jz&9I<OKx
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package org.rut.util.algorithm.support; c[_^bs>k
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import org.rut.util.algorithm.SortUtil; -MU.Hu
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/** Q4Fq=kTE
* @author treeroot UvJuOh+
* @since 2006-2-2 .*-w UBr
* @version 1.0 B36puz 0{
*/ OP`Jc$|6
public class ImprovedQuickSort implements SortUtil.Sort { ?%/u/*9rj
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private static int MAX_STACK_SIZE=4096; |( 9#vt#
private static int THRESHOLD=10; )S}; k=kG
/* (non-Javadoc) jS3(>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?4[Oh/]R
*/ SiqX1P
public void sort(int[] data) { }BdVD t
int[] stack=new int[MAX_STACK_SIZE]; dIpW!Pj^
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int top=-1; D`:d'ow~KQ
int pivot; uO@3vY',n
int pivotIndex,l,r; RefRoCD1
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stack[++top]=0; U5CPkH1
stack[++top]=data.length-1; Ldhk^/+
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while(top>0){ q7f;ZK=f
int j=stack[top--]; +O$:
int i=stack[top--]; N1N{Ol'
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pivotIndex=(i+j)/2; nt0\q'&
pivot=data[pivotIndex]; )R8%'X;U
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SortUtil.swap(data,pivotIndex,j);
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//partition "WbVCT'i
l=i-1; g(1B W#$
r=j; AR~$MCR]"k
do{ =v4r M0m,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); >$naTSJq
SortUtil.swap(data,l,r); 4[#6<Ixf
} /ggkb8<3
while(l SortUtil.swap(data,l,r); Bug}^t{M
SortUtil.swap(data,l,j); qwF*(pTHq
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if((l-i)>THRESHOLD){ %8bzs?QI
stack[++top]=i; +an^e'
stack[++top]=l-1; ^{*f3m/
} 2Za,4'
if((j-l)>THRESHOLD){ u-QO>3oY6
stack[++top]=l+1; 2zKo
stack[++top]=j; 1<a@ p}
} ;EJPrDHTk
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} & &" 'dL
//new InsertSort().sort(data); Lo9G4Cu
insertSort(data); z^rhgs?4
} h;%i/feFg
/** Ln=>@
* @param data x*h `VS(?6
*/
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private void insertSort(int[] data) { xaWGa1V'z
int temp; h41$|lonU%
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Z>x7|Q3CX
} m0|Ae@g~3
} ZD)0P=%
} 6Q2orn[
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} XLZ j
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