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快速排序: "_+X#P
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package org.rut.util.algorithm.support; g$VcT\X
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import org.rut.util.algorithm.SortUtil; qx
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/** 4,9AoK)yp
* @author treeroot =1^a/
* @since 2006-2-2 ih`/1n
* @version 1.0 Z_' %'&Y
*/ q?z6|]M|u
public class QuickSort implements SortUtil.Sort{ $n `Zvl2
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/* (non-Javadoc) yp5*8g5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) QxnP+U~N
*/ 3DK^S2\zBm
public void sort(int[] data) { o!mfd}nG
quickSort(data,0,data.length-1); d;S:<]l'
} AX**q$'R
private void quickSort(int[] data,int i,int j){ yP0P-8
int pivotIndex=(i+j)/2; "b%hAdR
//swap 5!#"8|oY
SortUtil.swap(data,pivotIndex,j); L:YsAv
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int k=partition(data,i-1,j,data[j]); Te'^O,C)y$
SortUtil.swap(data,k,j); hx4!P( o1
if((k-i)>1) quickSort(data,i,k-1); ==x3|^0y
if((j-k)>1) quickSort(data,k+1,j); <6/XE@"
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} ,<hXNN
/** 4:r^6m%%
* @param data 37p0*%a":
* @param i #BS]wj2#
* @param j %fP^Fh
* @return ~b\7qx_a9
*/ JoW*)3Z
private int partition(int[] data, int l, int r,int pivot) { p8s2#+/
do{ Oi
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while(data[++l] while((r!=0)&&data[--r]>pivot); {\|? {8f
SortUtil.swap(data,l,r); u-UUF
} ?^BsR
while(l SortUtil.swap(data,l,r); 1@)]+* F*z
return l; gbpm::
} k6JB%m\E
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} k`g+
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改进后的快速排序: `RGZ-Q{_
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package org.rut.util.algorithm.support; x(}t r27o
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import org.rut.util.algorithm.SortUtil; ~$r^Ur!E\
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/** 74gU4T
* @author treeroot H'gPGOd
* @since 2006-2-2 lG#&Pv>-
* @version 1.0 K'?ab 0
*/ bG^eP:r
public class ImprovedQuickSort implements SortUtil.Sort { Jr17pu(t
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private static int MAX_STACK_SIZE=4096; 2IjqTL
private static int THRESHOLD=10; hN\E8"To
/* (non-Javadoc) w41#?VC/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hph 3kfR
*/ yWzvE:!)
public void sort(int[] data) { bSz6O/A/
int[] stack=new int[MAX_STACK_SIZE]; QQ2xNNF[
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int top=-1; KD,b.s
int pivot; :@:R4Ac
int pivotIndex,l,r; =m} {g/Bk
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stack[++top]=0; Fg#*rzA
stack[++top]=data.length-1; 0RoI`>j'
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while(top>0){ ?9?0M A<[i
int j=stack[top--]; X0vkdNgW
int i=stack[top--]; &)s
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pivotIndex=(i+j)/2; D%^EG8i n.
pivot=data[pivotIndex]; \XRViG,|5
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SortUtil.swap(data,pivotIndex,j);
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//partition EXJ>Z
l=i-1; B/5C jHz
r=j; ev8E.ehD
do{ }1R k]$XC
while(data[++l] while((r!=0)&&(data[--r]>pivot)); { +C>^b
SortUtil.swap(data,l,r); QJ"Bd`wc
} vpXS!o>/Sn
while(l SortUtil.swap(data,l,r); 6bb=;
SortUtil.swap(data,l,j); VKN^gz
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if((l-i)>THRESHOLD){ <