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快速排序: ?DAW~+,!7o
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package org.rut.util.algorithm.support; jU 4*fzsZI
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import org.rut.util.algorithm.SortUtil; kR
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/** O@.afk"{
* @author treeroot Bld%d:i
* @since 2006-2-2 R~z@voM*<
* @version 1.0 m,zZe}oJ
*/ o_2mSD!
public class QuickSort implements SortUtil.Sort{ }]-SAM
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/* (non-Javadoc) =r<0l=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \\j98(i
*/ 8QFn/&Ql$B
public void sort(int[] data) { i.4L;(cg
quickSort(data,0,data.length-1); v>vU]6l
} Rp#9T?i``[
private void quickSort(int[] data,int i,int j){ Ivw+U-Mz
int pivotIndex=(i+j)/2; $gYy3y
//swap mY+.(N7m
SortUtil.swap(data,pivotIndex,j); 'O#,;n
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int k=partition(data,i-1,j,data[j]); n&?]GyQ
SortUtil.swap(data,k,j); &FQ]`g3_@
if((k-i)>1) quickSort(data,i,k-1); NNWbbU3wjh
if((j-k)>1) quickSort(data,k+1,j); $N7:;X"l
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} zTFfft<
/** -0KQR{LI
* @param data $Cr? }'a
* @param i )~hsd+ 0t
* @param j !Ua74C
* @return R~-r8dWcw
*/ "HWl7c3q
private int partition(int[] data, int l, int r,int pivot) { \wmNeGC2
do{ %cM2;a=2
while(data[++l] while((r!=0)&&data[--r]>pivot); X@,xwsM%tb
SortUtil.swap(data,l,r); SE0"25\_G
} '/gw`MJ
while(l SortUtil.swap(data,l,r); #y~`nyg%|
return l; jni }o m
} :!vDX2o)\
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} E6);\SJG}
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改进后的快速排序: x\ :x`k@
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package org.rut.util.algorithm.support; 8G?{S.%.
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import org.rut.util.algorithm.SortUtil; >x%Z^U
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/** oa:GGW4Q
* @author treeroot ~lx5RTkp
* @since 2006-2-2 C9-90,
* @version 1.0 {5+t\~q$
*/ s'LY)_n
public class ImprovedQuickSort implements SortUtil.Sort { v})0zz?,1
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private static int MAX_STACK_SIZE=4096; >@b70X!J]
private static int THRESHOLD=10; PI7M3\z
/* (non-Javadoc) )J/,-p
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nq#k}Qx:
*/ r4}:t$
public void sort(int[] data) { ;{]%ceetcu
int[] stack=new int[MAX_STACK_SIZE]; P;>8S:8
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int top=-1;
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int pivot; cdL$T6y
int pivotIndex,l,r; EP#3+BsH
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stack[++top]=0; $CaF"5}?Ke
stack[++top]=data.length-1; 6MfjB@
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while(top>0){ EthnI7Y
int j=stack[top--]; clz6;P
int i=stack[top--]; NQq$0<7.=W
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pivotIndex=(i+j)/2; zJ4 2%0g
pivot=data[pivotIndex]; JLT^0wBB
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SortUtil.swap(data,pivotIndex,j); _20nOg`o
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//partition [wAI;=.
l=i-1; "}PaMR]
r=j; D_,}lsrb
do{ -#v1b>ScY
while(data[++l] while((r!=0)&&(data[--r]>pivot));
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SortUtil.swap(data,l,r); >^%]F[Wo
} tP2hU[7Z
while(l SortUtil.swap(data,l,r); >Pv#)qtm
SortUtil.swap(data,l,j); ]|[,N>
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if((l-i)>THRESHOLD){ F9q<MTh
stack[++top]=i; &1:xY.Zs_
stack[++top]=l-1; ^9eJ)12pK
} sfez0Uqe.~
if((j-l)>THRESHOLD){ vukI`(#
stack[++top]=l+1; @bdGV#*d
stack[++top]=j; /jih;J|
} |`9POl=
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} U/E M(y
//new InsertSort().sort(data); S?nXpYr
insertSort(data); uzL)qH$b
} #_{3W-35*
/** HK>!%t0S
* @param data w">XI)*z
*/ <5MnF
private void insertSort(int[] data) { oDul ?%
int temp; Klh7&HzR
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); m4(:H(Za
} '7Dg+a^x7
} P?*$Wf,~n
} ;X6FhQ;{*0
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} -~eNC^t;W
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