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快速排序: ]>_Ie?L)<
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package org.rut.util.algorithm.support; |,)=-21&;
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import org.rut.util.algorithm.SortUtil; \2U F J
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/** >0c4C<_
* @author treeroot @b]?Gg
* @since 2006-2-2 9vL n#_
* @version 1.0 z]d2
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*/ Kh'7N!
public class QuickSort implements SortUtil.Sort{ MpCK/eiC
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/* (non-Javadoc) ~k[mowz0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 40i]I@:JK
*/ D *Hy 2eZ.
public void sort(int[] data) { xhTiOt6l
quickSort(data,0,data.length-1); ^|kqy<<X
} yKb+bm&5:'
private void quickSort(int[] data,int i,int j){ uKF)'gj
int pivotIndex=(i+j)/2; |f}1bJE+
//swap H4Lvw8G
SortUtil.swap(data,pivotIndex,j); ~u^MRe|`
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int k=partition(data,i-1,j,data[j]); ?ypX``3#s7
SortUtil.swap(data,k,j); 93]67PL#+
if((k-i)>1) quickSort(data,i,k-1); =F9!)r
if((j-k)>1) quickSort(data,k+1,j); }:zTz%_K
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} ZOIx+%/Vd#
/** ^V;h>X|
* @param data b,r{wrLe)
* @param i %xuJQuCqf
* @param j 7}%Z>
* @return fC<pCdsg
*/ B K/_hNz
private int partition(int[] data, int l, int r,int pivot) { zMI_8lNz
do{ 9o<5Z=
while(data[++l] while((r!=0)&&data[--r]>pivot); </B<=tc
SortUtil.swap(data,l,r); duT'$}2@>
} 0<4Nf]i
while(l SortUtil.swap(data,l,r); kWW$*d$
return l; XhEJF !
} + _"AF|
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} QHmF,P
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改进后的快速排序: HCIS4}lQ
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package org.rut.util.algorithm.support; K@R *
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import org.rut.util.algorithm.SortUtil; xk\n F0z
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/** 0~( f<:
* @author treeroot Z6\H4,k&
* @since 2006-2-2 d:&=|kKw
* @version 1.0 cy{ ado2
*/ QRFBMq}'
public class ImprovedQuickSort implements SortUtil.Sort { .d?2Kc)SV\
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private static int MAX_STACK_SIZE=4096; fnZ?YzLI
private static int THRESHOLD=10; @q/E)M?
/* (non-Javadoc) "x~su?KiA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #[B]\HO
*/ zg+6<
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public void sort(int[] data) { Yk @/+PE
int[] stack=new int[MAX_STACK_SIZE]; :rzq[J^
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int top=-1; 4mM?RGWv
int pivot; S:YQVj
int pivotIndex,l,r; dHO8 bYBH
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stack[++top]=0; vp2s)W8W
stack[++top]=data.length-1; , SB5"
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while(top>0){ EZb_8<DH
int j=stack[top--]; efUa[XO
int i=stack[top--]; {,Z-GJ
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pivotIndex=(i+j)/2; $z
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pivot=data[pivotIndex]; )8@|+'q
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SortUtil.swap(data,pivotIndex,j); f2.|[
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//partition /O{iL:`
l=i-1; 'J1!P:tJ
r=j; )1iqM]~;B
do{ mnm7{?#[
while(data[++l] while((r!=0)&&(data[--r]>pivot)); IDn$w^"
SortUtil.swap(data,l,r); +JlPQ~5
} ~/m=Q<cV
while(l SortUtil.swap(data,l,r); dW#T1mB
SortUtil.swap(data,l,j); 5h7M3s
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[
if((l-i)>THRESHOLD){ >p?Vv0*
stack[++top]=i; ^jB17z[
stack[++top]=l-1; +.pri
} j[Z<|Da
if((j-l)>THRESHOLD){ [$e\?c
stack[++top]=l+1; `:#IZ
stack[++top]=j; lNbAt4]}f(
} \\9I:-j:p
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} #Mm1yXNu
//new InsertSort().sort(data); c5- 56Q
insertSort(data); {NTMvJLm
} D&-cNxh
/** HD!2|b~@
* @param data eo&^~OVT
*/ q. s'z}
private void insertSort(int[] data) { M"!{Dx~
int temp; o~`KOe
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); hUP?r/B
} d3jzGJrU}
} ?, m_q+
} 5Ei4$T
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} 'aqlNBG*
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