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快速排序: CMIjc(m
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package org.rut.util.algorithm.support; 9GdrJ~h
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import org.rut.util.algorithm.SortUtil; 'U)|m
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/** +|OkT
* @author treeroot 0 mWfR8h0
* @since 2006-2-2 TA}z3!-y*
* @version 1.0 Qhnz7/a9
*/ >8V;:(nt
public class QuickSort implements SortUtil.Sort{ 3986;>v
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/* (non-Javadoc) vO1P%)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E5lC'@D cz
*/ #;RP ?s
public void sort(int[] data) { vpY|S2w)Bp
quickSort(data,0,data.length-1); :\*hAV1i
} -#b-@sD
private void quickSort(int[] data,int i,int j){ -;z&">
int pivotIndex=(i+j)/2; Q^v8n1
//swap 7cn"@h rJ
SortUtil.swap(data,pivotIndex,j); ;<#fZ0(l;
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int k=partition(data,i-1,j,data[j]);
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SortUtil.swap(data,k,j); B{W2D
if((k-i)>1) quickSort(data,i,k-1); oOuhbFu
if((j-k)>1) quickSort(data,k+1,j); HnVUG4yZTD
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} $2F*p#l(<Z
/** :&dY1.<N+
* @param data j>M
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* @param i _tQ=ASe0
* @param j /n7F]Ok'*
* @return 4yC{BRbi
*/ VG'oy
private int partition(int[] data, int l, int r,int pivot) { /D_8uTS>d[
do{ Dd*T5A?
while(data[++l] while((r!=0)&&data[--r]>pivot); HPAg1bV:-
SortUtil.swap(data,l,r); -9{}rE
} Y}"|J ~
while(l SortUtil.swap(data,l,r); R,A|"Q
return l; gv;=Yhw.c
} ?x@B Ze
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} |rf\]3 F
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改进后的快速排序: 5/mW:G,&
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package org.rut.util.algorithm.support; pi5Al)0
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import org.rut.util.algorithm.SortUtil; IgC)YIhd
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/** T}P|uP
* @author treeroot /'G'GQrr
* @since 2006-2-2 N7Z&_$Bx
* @version 1.0 1z~;c|
*/ @l&5 |Cia
public class ImprovedQuickSort implements SortUtil.Sort { %yQ-~T@
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private static int MAX_STACK_SIZE=4096; x}1(okc
private static int THRESHOLD=10; )xP]rOT
/* (non-Javadoc) ~@z5Ld3xz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t9m:E
*/ oCSf$g8q
public void sort(int[] data) { *E.{i
int[] stack=new int[MAX_STACK_SIZE]; (EUX>IJ
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int top=-1; ;oC85I
int pivot;
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int pivotIndex,l,r; Np|iXwl1
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stack[++top]=0; e?L$RY,7
stack[++top]=data.length-1; i(,R$AU
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while(top>0){ Q%QpG)E
int j=stack[top--]; X!,Ngmw.
int i=stack[top--]; -H.;73Kb[
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pivotIndex=(i+j)/2; [fR<#1Z
pivot=data[pivotIndex]; \{G6!dV|S
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SortUtil.swap(data,pivotIndex,j); 5.VA1
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//partition 1y_{#,{>
l=i-1; ET_}x7
r=j; >g93Bj*
do{ )J (ekfM
while(data[++l] while((r!=0)&&(data[--r]>pivot)); >6ch[W5k@
SortUtil.swap(data,l,r); $F G4wA
} OU9=O>
while(l SortUtil.swap(data,l,r); 0+r/>-3]
SortUtil.swap(data,l,j); HK&F'\'}
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if((l-i)>THRESHOLD){ wC=IN
stack[++top]=i; K
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stack[++top]=l-1; -mX
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} )l30~5u<J
if((j-l)>THRESHOLD){ =q5A@!D
stack[++top]=l+1; w^`n
stack[++top]=j; Fw"~f5O
} q.<q(r
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} ~z|/t^
//new InsertSort().sort(data); )zUV6U7v
insertSort(data); ^n] tf9{I
} qI;k2sQR
/** "VcGr#zW
* @param data r7ywK9UL
*/ tk}qvW.Ii
private void insertSort(int[] data) { ,*S?L
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int temp; \~y>aYy
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); -zc9=n<5
} z^}T=
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} 0yAvAx
} Jz:d\M~j5
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} W11_MTIU
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