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快速排序: :j_OO5b!
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package org.rut.util.algorithm.support; /Iht,@%E
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import org.rut.util.algorithm.SortUtil; .>?h
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/** 0kC}qru'
* @author treeroot Mx?]7tI
* @since 2006-2-2 ?4>uGaU\
* @version 1.0 |^!#x Tj
*/ qYpuo
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public class QuickSort implements SortUtil.Sort{ X 'D ~#r
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/* (non-Javadoc) 6G2s^P1Dl@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +LBDn"5
*/ OS|uZ<"Rq3
public void sort(int[] data) { Xc)V;1
quickSort(data,0,data.length-1); 1K(a=o[Ce
} 9{&APxm
private void quickSort(int[] data,int i,int j){ 6x18g(KbP
int pivotIndex=(i+j)/2; "p]F q,
//swap )gM3,gSS
SortUtil.swap(data,pivotIndex,j); ifA=qn0=}
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int k=partition(data,i-1,j,data[j]); OPm?kr
SortUtil.swap(data,k,j); 6AS'MD%&
if((k-i)>1) quickSort(data,i,k-1); si`{>e~`6P
if((j-k)>1) quickSort(data,k+1,j); >)5=6{x
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} 2kv%k3Q{
/** ;=rM Ii
* @param data , $;g'z!N
* @param i lo }[o0X
* @param j q\ihye
* @return @\~qXz{6J
*/ OBF3)L]
private int partition(int[] data, int l, int r,int pivot) { r 5$(
do{ g 4n&k
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); B@ab[dm280
} o;#{N~4[$
while(l SortUtil.swap(data,l,r); G5^gwG+
return l; .3;bUJ1
} j
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} zs +[Aco)
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改进后的快速排序: Q:iW k6
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package org.rut.util.algorithm.support; Y`FGD25`
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import org.rut.util.algorithm.SortUtil; +mBJvrI
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/** Z=: oIAe
* @author treeroot +uPN+CgQ@
* @since 2006-2-2 -Q@jL{Ue
* @version 1.0 ?FRR";
*/ {$iJYS\
public class ImprovedQuickSort implements SortUtil.Sort { m8rz
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private static int MAX_STACK_SIZE=4096; Z2chv,SqCJ
private static int THRESHOLD=10; 'e6W$?z
/* (non-Javadoc) 2|k*rv}l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }9C5U>?
*/ ,5\:\e0H
public void sort(int[] data) { >/"XX,3
int[] stack=new int[MAX_STACK_SIZE]; PVO9KWv**
$,k SR}
int top=-1; v9~Hl
int pivot; XEqg%f
int pivotIndex,l,r; <!,q:[ee5
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stack[++top]=0; :,F^{
stack[++top]=data.length-1; \Rn.ug
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while(top>0){ Q}jbk9gM5
int j=stack[top--]; aMTY{
int i=stack[top--]; y? [*qnPj
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pivotIndex=(i+j)/2; QnxkD)f*0
pivot=data[pivotIndex]; [Hdk=p
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SortUtil.swap(data,pivotIndex,j); (2@b ,w^
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//partition SX}GKu
l=i-1; AW'tZF"
r=j; 6\86E$f=h
do{ 'OGOT0(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Y,D\_il_
SortUtil.swap(data,l,r); (Cp:NS
} M
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while(l SortUtil.swap(data,l,r); }jd[>zk
SortUtil.swap(data,l,j); eEsEW<su
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if((l-i)>THRESHOLD){ )I+1 b
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stack[++top]=i; nGW
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stack[++top]=l-1; if5Y!Tx?G
} 5*buRYck0
if((j-l)>THRESHOLD){ $#4z>~0
stack[++top]=l+1; [v-?MS
stack[++top]=j; 6@2p@eYo
} af{;4Cr
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} MC#bo{Bq3-
//new InsertSort().sort(data); |iM*}Ix-
insertSort(data); v03~=(
} tBBN62^X
/** (XqeX(s
* @param data Cu;X{F'H
*/ q1dYiG.-Z
private void insertSort(int[] data) { 5, Yk5?l<'
int temp; v,>F0ofJ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); tzpGKhrk6
} jo<