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快速排序: wa\Yc,R
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package org.rut.util.algorithm.support; 8iGS=M
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import org.rut.util.algorithm.SortUtil; ;}@.E@s%'
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/** 'JU(2mF
* @author treeroot nm`[\3R
* @since 2006-2-2 ~k^rI jR
* @version 1.0 (y*7
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*/ aY@]mMz\
public class QuickSort implements SortUtil.Sort{ EZ:pcnL{
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/* (non-Javadoc) %JF^@\E!|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p.A_,iE
*/ UyTsUkY
public void sort(int[] data) { 6!*be|<&
quickSort(data,0,data.length-1); IW?).%F
} U5\^[~vW
private void quickSort(int[] data,int i,int j){ DvB!-|ek
int pivotIndex=(i+j)/2; O2g9<H
//swap ;h<(vc3@f
SortUtil.swap(data,pivotIndex,j); zo6|1xq
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int k=partition(data,i-1,j,data[j]); ,R#pQ
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SortUtil.swap(data,k,j); 8Wqh 8$
if((k-i)>1) quickSort(data,i,k-1); ?<)4_
if((j-k)>1) quickSort(data,k+1,j); ~_8Dv<"a
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} I$7|?8
/** b"Hc==`
* @param data u1a0w
* @param i I!eu|_cF
* @param j IO3 p&sJ/
* @return cvxYuP~
*/ c%+/TO
private int partition(int[] data, int l, int r,int pivot) { uatY:GSR
do{ )eIC5>#.
while(data[++l] while((r!=0)&&data[--r]>pivot); `@TWZ%f6
SortUtil.swap(data,l,r); d9e_slx
} Kh&W\\K
while(l SortUtil.swap(data,l,r); 'K&^y%~py,
return l; VRU"2mQ.P6
} d!0iv'^ t
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改进后的快速排序: {*mf Is
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package org.rut.util.algorithm.support; -Pt.
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import org.rut.util.algorithm.SortUtil; *U>"_h T0
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/** fE`p
* @author treeroot IUf&*'_
* @since 2006-2-2 uPCzs$R
* @version 1.0 + OKk~GYf
*/ TWE>"8]
public class ImprovedQuickSort implements SortUtil.Sort {
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private static int MAX_STACK_SIZE=4096; S:B$c>
private static int THRESHOLD=10; q8A ;%.ZLG
/* (non-Javadoc) f euATL]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,Tp:. "
*/ tV?-
public void sort(int[] data) { *.%z
int[] stack=new int[MAX_STACK_SIZE]; +@] ,JlYf
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int top=-1; )XCG4-1
int pivot; `]~1pc
int pivotIndex,l,r; 1.24ZX
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stack[++top]=0; !0-KB#
stack[++top]=data.length-1; E' -lpE
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while(top>0){ 0JT"Pv_
int j=stack[top--]; D/[;Y<X#V
int i=stack[top--]; n?Zt\Kto
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pivotIndex=(i+j)/2; HuT4OGBFpC
pivot=data[pivotIndex]; R7\T.;8+
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SortUtil.swap(data,pivotIndex,j); J.;!l
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//partition K g6hySb
l=i-1; GFGW'}w-
r=j; izDfpr}s4
do{ m^!Kthq
while(data[++l] while((r!=0)&&(data[--r]>pivot)); eI,'7u4q
SortUtil.swap(data,l,r); srlxp_^
} >Nam@,hm
while(l SortUtil.swap(data,l,r); ZLDO&}
SortUtil.swap(data,l,j); "DO|B=EejP
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if((l-i)>THRESHOLD){ ~=GwNo_
stack[++top]=i; P2Jo^WS
stack[++top]=l-1; RGgePeaw
} 8Z|A'M
if((j-l)>THRESHOLD){ p!>5}f6
stack[++top]=l+1; Mz7qC3Z
stack[++top]=j; knn9s0'Q
} *@I/TX'\rY
C5Vlqc;
}
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//new InsertSort().sort(data); aD^jlt
insertSort(data); ^(kmF UV,Z
} w#v-h3XcF
/** }j$tFFVi~
* @param data MgO_gFr
*/ <
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private void insertSort(int[] data) { p[Zk;AT~
int temp; 3AcS$.G
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Rp+Lu
} ?;]Xc~
} _Z>ny&
} z0H+Or
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} iE0x7x P_
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