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快速排序: k*4?fr
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package org.rut.util.algorithm.support; 7 #,+Q(2
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import org.rut.util.algorithm.SortUtil; omV.Qb'NS
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/** +{/zP{jH
* @author treeroot qR_"aQ7s2
* @since 2006-2-2 iR#jBqXD
* @version 1.0 p;n )YY$
*/ p Nu13o~
public class QuickSort implements SortUtil.Sort{ $Mx.8FC +
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/* (non-Javadoc) D0QXvrf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tazBZ'\c
*/ |y%pP/;&!
public void sort(int[] data) { Smk]G))o{
quickSort(data,0,data.length-1); [jumq1
} ,XP9NHE
private void quickSort(int[] data,int i,int j){ 'q*1HNwGp
int pivotIndex=(i+j)/2; No[xf9>t
//swap q@(N 38D
SortUtil.swap(data,pivotIndex,j); "_)
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int k=partition(data,i-1,j,data[j]); l}AB):<Z
SortUtil.swap(data,k,j); n.lp
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if((k-i)>1) quickSort(data,i,k-1); JsPuxu_
if((j-k)>1) quickSort(data,k+1,j); ((dG<
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} 0l_-
/** <{-DYRiN
* @param data Q}2w~Cn\S
* @param i K0I-7/L
* @param j 6ldDt?iSg
* @return r9vC&pWZ
*/ 103Ik6.o
private int partition(int[] data, int l, int r,int pivot) { 6
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do{ @pkozE-
while(data[++l] while((r!=0)&&data[--r]>pivot); FySK&
SortUtil.swap(data,l,r); xEiW]Eo
} v5$zz w
while(l SortUtil.swap(data,l,r); wOk:Q4OjL
return l; o`sn/x
} ?y04g u6p
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改进后的快速排序:
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package org.rut.util.algorithm.support; ?4~lA
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import org.rut.util.algorithm.SortUtil; ?NwFpSB2
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/** uIPR*9~6o
* @author treeroot
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* @since 2006-2-2 . }1!MK5
* @version 1.0 A P\E
*/ 5y~[2jB:
public class ImprovedQuickSort implements SortUtil.Sort { 7vWB=r>5@
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private static int MAX_STACK_SIZE=4096; {M$8V~8D
private static int THRESHOLD=10; N,1wfOE
/* (non-Javadoc) :dj@i6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l-npz)EM
*/ NSkI2>+P
public void sort(int[] data) { l{3utQH-=z
int[] stack=new int[MAX_STACK_SIZE]; 9!OpW:bR|
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int top=-1; {p/m+m
int pivot; = G_6D
int pivotIndex,l,r; _1Eyqh`oh
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stack[++top]=0; 8;5/_BwMu
stack[++top]=data.length-1; G@;aqe[dB
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while(top>0){ TvP# /qGgG
int j=stack[top--]; BOG )JaDW
int i=stack[top--]; nk{1z\D{
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pivotIndex=(i+j)/2; D'&LwU,o
pivot=data[pivotIndex]; ~DD/\V
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SortUtil.swap(data,pivotIndex,j); ~,:f,FkSQ
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//partition y/FisX
l=i-1; o6r4tpiR5
r=j; j0GI[#
do{ 2Ar<(v$
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 76m[o
SortUtil.swap(data,l,r); 9NT;^K^I
} Q^k#?j#
while(l SortUtil.swap(data,l,r); 6~}H3rvO}
SortUtil.swap(data,l,j); U,=K_oBAq
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if((l-i)>THRESHOLD){ J-}NFWR;t
stack[++top]=i; UyQn onS
stack[++top]=l-1; X=3@M_Jzo
} r>Ln*R,9D
if((j-l)>THRESHOLD){ CytpL`&^]
stack[++top]=l+1; 7'|PHQ? S
stack[++top]=j; I?K0bs+6
} gy{a+Wbc*
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} FMVmH!E
//new InsertSort().sort(data); H[D/Sz5`
insertSort(data); |$PLZ,
} $ZS9CkN
/** :~(im_r
* @param data V%ch'
*/ qC )VT3
private void insertSort(int[] data) { K\b O[J
int temp; />C~a]}
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 9QMn%8=j
} X2cR+Ha0
} R~~rqvLm
}
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