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快速排序: cmTZ))m
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package org.rut.util.algorithm.support; O
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import org.rut.util.algorithm.SortUtil; L2$%h1
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/** M@8(h=
* @author treeroot }Y[.h=X
* @since 2006-2-2 6=
* @version 1.0 Q|>y2g!
*/ D"MNlm
public class QuickSort implements SortUtil.Sort{ VioVtP0
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/* (non-Javadoc) eR/7*G5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a4wh-35/
*/ (n<xoV[e
public void sort(int[] data) { *VH1(E`hl
quickSort(data,0,data.length-1); e\89;)
} Q_dFZ
private void quickSort(int[] data,int i,int j){ P|\,kw>l
int pivotIndex=(i+j)/2; Y4_i=}\*vf
//swap 5XhV+t
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SortUtil.swap(data,pivotIndex,j); r~sGot+sQA
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int k=partition(data,i-1,j,data[j]); 6V)# Yf
SortUtil.swap(data,k,j); l$FHL2?Cp
if((k-i)>1) quickSort(data,i,k-1); it.l;L_nW
if((j-k)>1) quickSort(data,k+1,j); `27? f$,
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} 9u9#&xx
/** "x{S3v4Rb5
* @param data /4|qfF3
* @param i FUDMaI
* @param j qG;WX n
* @return ]?kf;A@
*/ ' :Te#S
private int partition(int[] data, int l, int r,int pivot) { Cc^t&Eg
do{ g$<@!
while(data[++l] while((r!=0)&&data[--r]>pivot); ISl'g'o
SortUtil.swap(data,l,r); I=1tf;Bsi
} =q._Qsj?fu
while(l SortUtil.swap(data,l,r); *mYec~
return l; h\1_$ac
} W>"i0p
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} 8]0^OSS
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改进后的快速排序: DzYno-]A]
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package org.rut.util.algorithm.support; ]Z~H9!%t
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import org.rut.util.algorithm.SortUtil; |h.he_B+7
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/** 5!?><{k=%
* @author treeroot X}^,g
* @since 2006-2-2 W
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* @version 1.0 u~G,=n
*/ 13B[mp4
public class ImprovedQuickSort implements SortUtil.Sort { tn p]wZ
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private static int MAX_STACK_SIZE=4096; f$P pFSY4
private static int THRESHOLD=10; N^)L@6
/* (non-Javadoc) w{0UA6 +
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -tDmzuD6
*/ ]e+S ~me
public void sort(int[] data) { qgu.c`GmW
int[] stack=new int[MAX_STACK_SIZE]; |vzGFfRI
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int top=-1; C7PHZ`<
int pivot; O10h(Wg
int pivotIndex,l,r; Lx2.E1?@
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stack[++top]=0; Y,?rykRj
stack[++top]=data.length-1; p7|~x@q+
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while(top>0){ T#T!a0
int j=stack[top--]; M,6m*
int i=stack[top--]; h4ZrD:D0\
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pivotIndex=(i+j)/2; 2TY|)ltsF
pivot=data[pivotIndex]; g,9o'fs`x
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SortUtil.swap(data,pivotIndex,j); voCQ_~*)9
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//partition DaaLRMQ=
l=i-1; i9W@$I,f
r=j; 7LKNEll
do{ p.&FK'&[0
while(data[++l] while((r!=0)&&(data[--r]>pivot)); O']-<E`1k
SortUtil.swap(data,l,r); &rk/ya[
}
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while(l SortUtil.swap(data,l,r); lY0^Z
SortUtil.swap(data,l,j); Ql!$e&A|l
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if((l-i)>THRESHOLD){ @ScH"I];uA
stack[++top]=i; ,M5J~Ga
stack[++top]=l-1; T+RfMEdr
} KZJ;O7'`
if((j-l)>THRESHOLD){ aw {?UvL&
stack[++top]=l+1; ]uj6-0q){W
stack[++top]=j; ho;Km
} wF[^?K '
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} KE6[ u*\
//new InsertSort().sort(data); H/YZwDx,i
insertSort(data); Il>!C\hU
} }5FdX3YR
/** \A
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* @param data C4]vq+
*/ h)fi9
private void insertSort(int[] data) { ^. M*pe
int temp; m^% [
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 0k0y'1SL
} G)M9to
} MW6d-
} S2h?Q$e3
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} Mq8jPjL
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