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快速排序: &qU[wn:1
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package org.rut.util.algorithm.support; fr?eOigbl
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import org.rut.util.algorithm.SortUtil; MQ+ek4
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/** Iu[EUi!"
* @author treeroot f
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* @since 2006-2-2 Vg+SXq6G
* @version 1.0 ZJpI]^9|
*/ lV
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public class QuickSort implements SortUtil.Sort{ |<V{$),k
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/* (non-Javadoc) |l|]Tw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xH0/R LK3J
*/ xki"'
public void sort(int[] data) { ,*4"d._Y
quickSort(data,0,data.length-1); NLpD,q{
} [Ok8l='
private void quickSort(int[] data,int i,int j){ e&5K]W0{
int pivotIndex=(i+j)/2; hJ<2bgQo
//swap p\WUk@4
SortUtil.swap(data,pivotIndex,j); 7S`H?},sR
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int k=partition(data,i-1,j,data[j]); ~<%cc+;`
SortUtil.swap(data,k,j); U)!AH^{32
if((k-i)>1) quickSort(data,i,k-1); 8if"U xV(
if((j-k)>1) quickSort(data,k+1,j); v(^rq
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} Wg%-m%7O
/** GN<I|mGLJK
* @param data 8zCAy@u
* @param i 3KKe4{oG
* @param j ]| yH8 m
* @return twtDyo(\
*/ $ZU(bEUOG
private int partition(int[] data, int l, int r,int pivot) { H1[aNwLr
do{ zi
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while(data[++l] while((r!=0)&&data[--r]>pivot); agYKaM1N
SortUtil.swap(data,l,r); K9 q~Vf
} `O{Uz?#*x
while(l SortUtil.swap(data,l,r); $-RhCnE
return l; 9zyN8v2
} #+;=ijyF
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} 6`C27
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改进后的快速排序: DX";v
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package org.rut.util.algorithm.support; K*9b `%
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import org.rut.util.algorithm.SortUtil;
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/** o
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* @author treeroot Z|c9%.,
* @since 2006-2-2 Lvq]SzOw
* @version 1.0 [q&J"dt
*/ q,DX{:
public class ImprovedQuickSort implements SortUtil.Sort { dX*>?a
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private static int MAX_STACK_SIZE=4096; 2YKM9Ks
private static int THRESHOLD=10; 7gwZ9Fob
/* (non-Javadoc) ?/(K7>`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i!3K G|V
*/ hYn'uL^~[
public void sort(int[] data) { 6bNW1]rD
int[] stack=new int[MAX_STACK_SIZE]; ,[\(U!Z7:%
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int top=-1; *u/|NU&X
int pivot; wIF
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int pivotIndex,l,r; s%oAsQ_y
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stack[++top]=0; $:[BB,$
stack[++top]=data.length-1; 0*?XQV@
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while(top>0){ s8[9YfuW
int j=stack[top--]; 4C%>/*%8>
int i=stack[top--]; ?+5{HFx
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pivotIndex=(i+j)/2; iyYY)roB
pivot=data[pivotIndex]; A#X.c=
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SortUtil.swap(data,pivotIndex,j); C|\^uR0
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//partition aT#{t{gkA
l=i-1; Db=>7@h3C
r=j; S=,1}
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do{ $ud>Z;X=P
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 1gm/{w6O
SortUtil.swap(data,l,r);
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} l;*lPRoW,
while(l SortUtil.swap(data,l,r); 1bg@[YN!;
SortUtil.swap(data,l,j); \GvY`kt3
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if((l-i)>THRESHOLD){ d7J[.^\
stack[++top]=i; q7&yb.<KD.
stack[++top]=l-1; I#t9aR+&
} 93IOG{OAY
if((j-l)>THRESHOLD){ 4AOS}@~W
stack[++top]=l+1; M/a/H=J
stack[++top]=j; C;q}3c*L
} _(`X .D
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} B"m:<@ "
//new InsertSort().sort(data); BG:`Fq"T
insertSort(data); +){a[@S@x
} 8TZA T%4
/** 9c{%m4
* @param data `A'I/Hf5
*/ v^W?o}W
private void insertSort(int[] data) { -`dxx)x
int temp; u rXb!e{l
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); fslk7RlSKg
} #IaBl?}r^
} $Kz\
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} NB5L{Gf6-
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} v?D
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