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快速排序: 0i1?S6]d-
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package org.rut.util.algorithm.support; ovRCF(Og,
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import org.rut.util.algorithm.SortUtil; ]KII?{<k
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/** u*YuU%H=
* @author treeroot L bK1CGyA
* @since 2006-2-2 K
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* @version 1.0 hQRc,d6x5
*/ r?{LQWP>e
public class QuickSort implements SortUtil.Sort{ 6b5{
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/* (non-Javadoc) Iw-6Z+ 94
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %4g4 C#
*/ hD~/6bx
public void sort(int[] data) { hCx#H eh
quickSort(data,0,data.length-1); ViC76aJ
} vf'jz`Z
private void quickSort(int[] data,int i,int j){ UgBY
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int pivotIndex=(i+j)/2; PyJblW
//swap FH@e:-*=
SortUtil.swap(data,pivotIndex,j); D2mAyU-
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int k=partition(data,i-1,j,data[j]); Sf8Xj|u
SortUtil.swap(data,k,j); rEyMSLN
if((k-i)>1) quickSort(data,i,k-1); W2V@\
if((j-k)>1) quickSort(data,k+1,j); ,DsT:8
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} $7ME a"a
/** %-zH]"Q$
* @param data ZXRN?b
* @param i S %%qn
* @param j mi3q1npb7[
* @return 8XXTN@&,
*/ -^%"w
private int partition(int[] data, int l, int r,int pivot) { RB
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do{ = ~R3*GN
while(data[++l] while((r!=0)&&data[--r]>pivot); >?\ !k
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SortUtil.swap(data,l,r); O4+w2'.,
} Ki6BPi^
while(l SortUtil.swap(data,l,r); A^jm<~
return l; |[t=.dK%
} 8&AorYw[
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} "alO"x8t
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改进后的快速排序: JC-yiORVr
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package org.rut.util.algorithm.support; YmF(o
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import org.rut.util.algorithm.SortUtil; Tl{r D(D
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/** MjosA R
* @author treeroot :)S4MoG
* @since 2006-2-2 z^a?t<+
* @version 1.0 r]vBr^kq
*/ Z~:lfCK`
public class ImprovedQuickSort implements SortUtil.Sort { lP
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private static int MAX_STACK_SIZE=4096; , 0ja _
private static int THRESHOLD=10; ?~9X:~6\
/* (non-Javadoc) F>nrV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3m9E2R,
*/ B}bNl 7
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public void sort(int[] data) { Cd*C^cJU&z
int[] stack=new int[MAX_STACK_SIZE]; )x $Vy=
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int top=-1; f\_Q+!^
int pivot; y(g
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int pivotIndex,l,r;
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stack[++top]=0; un%"s:
stack[++top]=data.length-1; 7Et(p'
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while(top>0){ BuO J0$
int j=stack[top--]; ^ @cX0_
int i=stack[top--]; 9%veUvY
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pivotIndex=(i+j)/2; y9mZQq
pivot=data[pivotIndex]; agot
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SortUtil.swap(data,pivotIndex,j); uZI:Kt#
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//partition a,\u|T:g
l=i-1; ;Q 6e&Ips/
r=j; 3
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do{ ;0{*V5A
while(data[++l] while((r!=0)&&(data[--r]>pivot)); KPrxw }P
SortUtil.swap(data,l,r); f4^_FK&
} `{;&Qcg6m
while(l SortUtil.swap(data,l,r); Y)5}bmL
SortUtil.swap(data,l,j); uvd>
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if((l-i)>THRESHOLD){ W u{nC
stack[++top]=i; .;Yei6H
stack[++top]=l-1; AE~}^(G`
}
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if((j-l)>THRESHOLD){ iIRigW
stack[++top]=l+1; &?pAt30K:
stack[++top]=j; ;f*xOdi*k
} dRC+|^rSC
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} $*> _0{<
//new InsertSort().sort(data); \}c50}#0
insertSort(data); lsf?R'1
} eu/Sp3@v
/** -I<`!kH*
* @param data o?\Pw9Y
*/ l^Z~^.{y
private void insertSort(int[] data) { oDK\v8w-
int temp; 7qp|Msf},
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); )f|6=x4
} < ,n4|z)
} j(N9%/4u
} 81C?U5
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} 53xq%
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