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快速排序: b^=8%~?%4
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package org.rut.util.algorithm.support; `\/Wa h}I
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import org.rut.util.algorithm.SortUtil; X|QX1dl
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/** $K>d \{@+7
* @author treeroot a!6OE"?QQ
* @since 2006-2-2 iz|9a|k6x
* @version 1.0 *dn-,Q%`
*/ *^$N$t/2
public class QuickSort implements SortUtil.Sort{ e715)_HD
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/* (non-Javadoc) W} +6L|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oY#XWe8Om
*/ IEKX'+t'
public void sort(int[] data) { g5TLX&Bd
quickSort(data,0,data.length-1); d T-O8
} C(Bar#
private void quickSort(int[] data,int i,int j){ @5nkI$>3z
int pivotIndex=(i+j)/2; 7$!Bq#
//swap uS+b* :
SortUtil.swap(data,pivotIndex,j); fqp7a1qQl
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int k=partition(data,i-1,j,data[j]); Yv`1ySR
SortUtil.swap(data,k,j); ]H@uuPT!
if((k-i)>1) quickSort(data,i,k-1); 98%a)s)(a
if((j-k)>1) quickSort(data,k+1,j); Q,LWZw~"
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} f>JzG,-
/** 0i1?S6]d-
* @param data
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* @param i sC*E;7gT,
* @param j [}g5Z=l
* @return &cv/q$W4
*/ N7|W.(
private int partition(int[] data, int l, int r,int pivot) { X]qp~:4G
do{ kO\&mL&
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while(data[++l] while((r!=0)&&data[--r]>pivot); kTe<1^,m
SortUtil.swap(data,l,r); 'bqf?3W
} ,Y/>*,J
while(l SortUtil.swap(data,l,r); c\?/^xr'!}
return l; Mh@ylp+q
} _:z;j{@4
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} PYRwcJ$b\d
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改进后的快速排序: gM/_:+bT>P
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package org.rut.util.algorithm.support; zqEZ+|c=
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import org.rut.util.algorithm.SortUtil; {>qrf:
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/** FH@e:-*=
* @author treeroot D2mAyU-
* @since 2006-2-2 sg~/RSJ3
* @version 1.0 J +Y|# U
*/ |@4hz9~3
public class ImprovedQuickSort implements SortUtil.Sort { Kof-;T
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private static int MAX_STACK_SIZE=4096; )9P
private static int THRESHOLD=10;
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/* (non-Javadoc) zCN;LpbEJY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) NomK(%8m$
*/ x-P_}}K 79
public void sort(int[] data) { ~1z8G>R
int[] stack=new int[MAX_STACK_SIZE]; NxRiEe#m
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int top=-1; !Kn+*' #
int pivot; cF6@.)
int pivotIndex,l,r; Ts *'f
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stack[++top]=0; ku8Z;ONeH
stack[++top]=data.length-1; s`#j8>`M
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while(top>0){
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int j=stack[top--]; l%V}'6T
int i=stack[top--]; X>YOo~yS5
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pivotIndex=(i+j)/2; 206jeH9
pivot=data[pivotIndex]; _34YH 5
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SortUtil.swap(data,pivotIndex,j); Nr7.BDA
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//partition -x5bdC(d
l=i-1; ^hTJp{
r=j; YXOD
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do{
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); %bETr"Xom
SortUtil.swap(data,l,r); )%W2XvG
} 8U$UI
while(l SortUtil.swap(data,l,r); ~w%+y
SortUtil.swap(data,l,j); v\T1,Z@N^
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if((l-i)>THRESHOLD){ Ji:@z%osr
stack[++top]=i; 2{qG
stack[++top]=l-1; Cd*C^cJU&z
} )x $Vy=
if((j-l)>THRESHOLD){ YtKX\q^.
stack[++top]=l+1; f\_Q+!^
stack[++top]=j; y(g
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} Icb;Yzt
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} nmAXU!t'
//new InsertSort().sort(data); ^OsUWhkV
insertSort(data); M0\[hps~X
} BuO J0$
/** ^ @cX0_
* @param data 5q*~h4=r7
*/ N>iCb:_
T;
private void insertSort(int[] data) { D($UbT-v
int temp; )W#g@V)>
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); p5w g+K
} 4&WzGnK
} D*b|(Oi
} '\qr=0aW
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} dXN&<Q,
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