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快速排序: '=p?
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package org.rut.util.algorithm.support; ?]5Ix1
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import org.rut.util.algorithm.SortUtil; PGkCOmq
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/** 1 )'Iu`k/
* @author treeroot [EER4@_
* @since 2006-2-2 7/
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* @version 1.0 {<!hlB
*/ %P;[fJ
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public class QuickSort implements SortUtil.Sort{ Tv1]v.
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/* (non-Javadoc) ^;4YZwW5w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a5)JkC
*/ 1U'ZVJ5bpK
public void sort(int[] data) { #hy+ L
quickSort(data,0,data.length-1); AC'lS
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} >P<'L4;
private void quickSort(int[] data,int i,int j){ <n\i>A3`,S
int pivotIndex=(i+j)/2; qEZ!2R^`G
//swap 1LX)4TCC
SortUtil.swap(data,pivotIndex,j); ~XKZXGw
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int k=partition(data,i-1,j,data[j]); 4dD2{M
SortUtil.swap(data,k,j); kf'=%]9#_T
if((k-i)>1) quickSort(data,i,k-1); @+E7w6>%
if((j-k)>1) quickSort(data,k+1,j); >9MS"t
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} *x!LKIpv
/** ?^. Pt
* @param data UhdqY]
* @param i :T5A84/C
* @param j Fo(y7$33*
* @return uRpBeH]Z"
*/ i?x$w{co
private int partition(int[] data, int l, int r,int pivot) { ~2(]ZfO?>H
do{ ;t!9]1
while(data[++l] while((r!=0)&&data[--r]>pivot); >8(jW
SortUtil.swap(data,l,r); 03Ukw/D&
} h\FwgkJP
while(l SortUtil.swap(data,l,r); H#`8Ey
return l; #N$9u"8C
} c;^A)_/
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} ) $J7sa
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改进后的快速排序: \?dTH:v/E
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package org.rut.util.algorithm.support; C/)`<b(
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import org.rut.util.algorithm.SortUtil; ,_bp)-O G
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/** qX?[mdCHZ
* @author treeroot
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* @since 2006-2-2 (kY@7)d'e
* @version 1.0 9DPb|+O-
*/ %N1"*</q
public class ImprovedQuickSort implements SortUtil.Sort { ]=Pu\eE
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private static int MAX_STACK_SIZE=4096; @k9Pz<ub
private static int THRESHOLD=10; gH'3 dS!{
/* (non-Javadoc) Sc{Tq\t;%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1mix+.d
*/ XL~>rw<
public void sort(int[] data) { |T
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int[] stack=new int[MAX_STACK_SIZE]; h1-Gp3#
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int top=-1; EZ{\D!_Y
int pivot; s[T{c.F
int pivotIndex,l,r;
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stack[++top]=0; x,uBJ
stack[++top]=data.length-1; U6c@Et ,
.
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while(top>0){ ^vaL8+
int j=stack[top--]; 5k~\or 5_
int i=stack[top--]; m9!DOL1pl
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pivotIndex=(i+j)/2; x_W3sS]ej
pivot=data[pivotIndex]; N<n8'XDdG
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SortUtil.swap(data,pivotIndex,j); |]tZ hI"3<
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//partition y!5:dvt
l=i-1; $L\@da?
r=j; AqqHD=Yp
do{ KSsWjF}d
while(data[++l] while((r!=0)&&(data[--r]>pivot)); w5(yCyNp~
SortUtil.swap(data,l,r); =x#&\ui
} .<.#aY;N
while(l SortUtil.swap(data,l,r); cmIT$?J
SortUtil.swap(data,l,j); WGMb8 /{$P
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if((l-i)>THRESHOLD){ u>}zm_
stack[++top]=i; t)'dF*L
stack[++top]=l-1; cd&B?\I
} Fs)
if((j-l)>THRESHOLD){ qRl/Sl#F
stack[++top]=l+1; LuL$v+`
stack[++top]=j; q)k{W>O
} OfJd/D
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} `)2[ST
//new InsertSort().sort(data); 3a^)u-9,x
insertSort(data); mw"}8y
} }<&d]N
/** Khap9a_q-
* @param data dQK`sLChv
*/ O{u[+g
private void insertSort(int[] data) { !t%Q{`p
int temp; .l=p[BI
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); /tzlbI]z
} =hhvmo
} QoWR@u6a
} Y$+QNi
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} 6Hl<,(vn
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