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快速排序: P1$f}K}
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package org.rut.util.algorithm.support; fH&zR#T7U4
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import org.rut.util.algorithm.SortUtil; ubD#I{~J
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/** #sL/y
* @author treeroot $\+"qs)
* @since 2006-2-2 Tu==49
* @version 1.0 @sN^BX`z
*/ X!o@f$
public class QuickSort implements SortUtil.Sort{ miPmpu!
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/* (non-Javadoc) FZeP<Ban
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U8E0~[y'
*/ *jGPGnSo
public void sort(int[] data) { (yfXMp,x
quickSort(data,0,data.length-1); ]XY0c6
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} 4AJ9`1d4
private void quickSort(int[] data,int i,int j){ P>|Ef~j
int pivotIndex=(i+j)/2; hUBF/4s\
//swap _'&k#Q
SortUtil.swap(data,pivotIndex,j); 2,+d|1(4o
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int k=partition(data,i-1,j,data[j]); |l$
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SortUtil.swap(data,k,j); f]c<9Q>*
if((k-i)>1) quickSort(data,i,k-1); UBa-
if((j-k)>1) quickSort(data,k+1,j); bZu$0IG
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} 6I"C~&dt
/** ad9EG#mD#
* @param data Rw/Ciw2@?
* @param i N_0pO<<cs
* @param j ::ri3Tu
* @return O6/xPeak
*/ c+H)ed>
private int partition(int[] data, int l, int r,int pivot) { wBLsz/
do{ ZH!;z-R
while(data[++l] while((r!=0)&&data[--r]>pivot); }H5/3be
SortUtil.swap(data,l,r); ZxI]I1)
}
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while(l SortUtil.swap(data,l,r); ?x'w~;9R/
return l; ~C0Pu.{o
} L -YNz0A
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} vABXXB
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改进后的快速排序: EPv%LX_j
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package org.rut.util.algorithm.support; URLk9PI
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import org.rut.util.algorithm.SortUtil; 3Mur*tj#
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/** (V8?,G >
* @author treeroot %TDXF_.[
* @since 2006-2-2 J,9%%S8/C
* @version 1.0 ]b> pI;
*/ (ZS/@He
public class ImprovedQuickSort implements SortUtil.Sort { *l:&f_ngV
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private static int MAX_STACK_SIZE=4096; L*9H#%3
private static int THRESHOLD=10; bK?MT]%}r
/* (non-Javadoc) *{Yh6{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) K\~v&
*/ ^:+Rg}]W^
public void sort(int[] data) { ~oo'ky*H!
int[] stack=new int[MAX_STACK_SIZE]; J+lGh9G
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int top=-1; 86y%=! bS
int pivot; 0lBat_<8
int pivotIndex,l,r; ldYeX+J
_
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stack[++top]=0; an. `dBm
stack[++top]=data.length-1; tq0;^L
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while(top>0){ Y|:YrZSC
int j=stack[top--]; xFU5\Zuw
int i=stack[top--]; vcwK6G
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pivotIndex=(i+j)/2; fQP,=
pivot=data[pivotIndex]; 0`6),R'x
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SortUtil.swap(data,pivotIndex,j); 1g~y]iQ
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//partition o _(0
l=i-1; v~f'K3fLp
r=j; <&6u]uKrW
do{ D,E$_0
while(data[++l] while((r!=0)&&(data[--r]>pivot)); y~dB5/
SortUtil.swap(data,l,r); =tn Tdp0F
} zWb-pF|
while(l SortUtil.swap(data,l,r); F(;jM(
SortUtil.swap(data,l,j); %EWq2'/5
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if((l-i)>THRESHOLD){ ;$z7[+M
stack[++top]=i; 3T?f5+@I
stack[++top]=l-1; 'u1=XX
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} ~GA8_B
if((j-l)>THRESHOLD){ Hsgy'X%om
stack[++top]=l+1; !VFem~'d
stack[++top]=j; Ox|TMSb^
} R3Ee%0QK
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} A=y"x$%-_
//new InsertSort().sort(data); vlu$!4I
insertSort(data); ]x@~-I )
} L_k9g12
/** %E aE,
* @param data |Q5+l.%
*/ K\aAM;)-
private void insertSort(int[] data) { JN|VPvjE
int temp; <XvYa{t]{
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); JtFiFaCxY
} S~> 5INud
} xD4$0Ppu
} #)`\!)?
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;
} Dp`HeSKU^
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