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快速排序: le*mr0a
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package org.rut.util.algorithm.support; j~,7JJ
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import org.rut.util.algorithm.SortUtil; %^s;{aN*!
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/** TxAT ))
* @author treeroot AY4ZU CqI
* @since 2006-2-2 Kn3qq
* @version 1.0 V\^rs41$;
*/ 0STtwfTr:
public class QuickSort implements SortUtil.Sort{ #-
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/* (non-Javadoc) eq.K77El{J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #g[jwl'
*/ N),bhYS]
public void sort(int[] data) { hR,VE'A
quickSort(data,0,data.length-1); }Kc[pp|9<
} Ug>yTc_(7
private void quickSort(int[] data,int i,int j){ Z7RGOZQ}G
int pivotIndex=(i+j)/2; `:cnu;
//swap DpjiE/*
SortUtil.swap(data,pivotIndex,j); }[ LME Z
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int k=partition(data,i-1,j,data[j]); >Ia{ZbQV
SortUtil.swap(data,k,j); H~%HTl
if((k-i)>1) quickSort(data,i,k-1); &ywAzGV{s
if((j-k)>1) quickSort(data,k+1,j); Nq'Cuwsp
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} )W9W8>Cc5_
/** @Ee{ GH^-
* @param data H59}d
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* @param i : l>&5w;
* @param j %UZ_wsY\
* @return z}\TS.
*/ 9bvz t8pc
private int partition(int[] data, int l, int r,int pivot) { #<df!)
do{ {^>dQ+S x7
while(data[++l] while((r!=0)&&data[--r]>pivot); C9zQ{G
SortUtil.swap(data,l,r);
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} :0G "EM4
while(l SortUtil.swap(data,l,r); 1}+lL)-!
return l; 1A\Jh3;Q
}
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改进后的快速排序: QX}O{LQR
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package org.rut.util.algorithm.support; x'Pp!
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import org.rut.util.algorithm.SortUtil; $YuVM
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/** DM"nxTVre
* @author treeroot >zcR ?PPs
* @since 2006-2-2 {n9]ej^
* @version 1.0 SXX6EIJr|
*/ /V@~Vlww
public class ImprovedQuickSort implements SortUtil.Sort { Ny|2Fcs
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private static int MAX_STACK_SIZE=4096; u1K;{>4lx
private static int THRESHOLD=10; EIZSV>
/* (non-Javadoc) sLiKcR8^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ',GWH:B
*/ Z)E[Bv=
public void sort(int[] data) { UjLZ!-}
int[] stack=new int[MAX_STACK_SIZE]; RbB
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int top=-1; [ ySO
int pivot; N&g9z{m7
int pivotIndex,l,r; VZ"W_U,
} :U'aa
stack[++top]=0; nXH U|5.I
stack[++top]=data.length-1; Lc,`
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while(top>0){ ={&}8VA
int j=stack[top--]; Zz!0|-\
int i=stack[top--]; o.Ld.I)
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pivotIndex=(i+j)/2; +~~FfIzf#
pivot=data[pivotIndex]; HPl'u'.Hg
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SortUtil.swap(data,pivotIndex,j); Jlgo@?Lc
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//partition
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l=i-1; >C,=elM
r=j; QC@nRy8%
do{ hAx#5@*5
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 3^p<Wx
SortUtil.swap(data,l,r); /C)mx#h]
} bvdAOvxChW
while(l SortUtil.swap(data,l,r); !YD~o/t@|
SortUtil.swap(data,l,j); &"!s +_
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if((l-i)>THRESHOLD){ tXj28sh$
stack[++top]=i; awP
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stack[++top]=l-1; 4o7(cP
}
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if((j-l)>THRESHOLD){ ,\*PpcU
stack[++top]=l+1; f-6hcd@Ca
stack[++top]=j; }.md$N_F
} xWkCP2$?P
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} JkT, i_
//new InsertSort().sort(data); VQSwRL3B=
insertSort(data); [I/f(GK
} 4`Com~`6"
/** >KF1]/y<
* @param data Y1e>P
*/ !uaV6K
private void insertSort(int[] data) { pfd||Z
int temp; k.Tu#7
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); P%#WeQ+
} Yphru"\$
} 1rs`|iX5
} nNb Oq[
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} "#7~}ZB
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