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快速排序: ,Y|WSKY*
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package org.rut.util.algorithm.support; LF\4>(C2g
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import org.rut.util.algorithm.SortUtil; }Gmwm|`*
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/** 9VyY[&
* @author treeroot L;d(|7BVv
* @since 2006-2-2 5;{Q >n
* @version 1.0 Ke0j8|
*/ :77dl/d%
public class QuickSort implements SortUtil.Sort{ K.k%Tg[ ~
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/* (non-Javadoc) xVOoYr>O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fUy:TCS
*/ SJ(<u2J]
public void sort(int[] data) { |X :"AH"S
quickSort(data,0,data.length-1); X
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} S>AM?
private void quickSort(int[] data,int i,int j){ )erI3?k
int pivotIndex=(i+j)/2; QMUmPx&
//swap 6\jhDP@`9
SortUtil.swap(data,pivotIndex,j); B(+J?0Dj
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int k=partition(data,i-1,j,data[j]); #~(J
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SortUtil.swap(data,k,j); koQ\]t'*As
if((k-i)>1) quickSort(data,i,k-1); no6q3<re
if((j-k)>1) quickSort(data,k+1,j); zo!e<>o
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} |Tn+Aq7
/** `_`\jd@
* @param data {G _ :#cep
* @param i m0*bz5
* @param j XxXMtiZ6
* @return 1ztL._Td
*/ ?];?3X~|
private int partition(int[] data, int l, int r,int pivot) { (^x ,
do{ /l o;:)AiP
while(data[++l] while((r!=0)&&data[--r]>pivot); ?)x"+[2
SortUtil.swap(data,l,r); hzG+s#
} >NL4&MV:
while(l SortUtil.swap(data,l,r); $9LI v
return l; $\:;N]Cs~0
} BhJag L ^o
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} 3zdm-5R.b
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改进后的快速排序: 8RGU^&
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package org.rut.util.algorithm.support; jIpc^iu`,
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import org.rut.util.algorithm.SortUtil; kkvG=
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/** a!iG;:K
* @author treeroot ){~]-VK
* @since 2006-2-2 ?]1_ 2\M
* @version 1.0 (e,5
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*/ <d&9`e1Hc
public class ImprovedQuickSort implements SortUtil.Sort { o5k7$0:t/
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private static int MAX_STACK_SIZE=4096; =a!w)z_rw
private static int THRESHOLD=10; gK8E|f-z
/* (non-Javadoc) S5a?KU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?g7O([*[
*/ E@uxEF
public void sort(int[] data) { iLd_{
int[] stack=new int[MAX_STACK_SIZE]; ~hx__^]d
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int top=-1; 6
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int pivot; ;:2:f1_
int pivotIndex,l,r; aaa6R|>0
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stack[++top]=0; #`kLU:
stack[++top]=data.length-1; {:peArO
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while(top>0){ 1m c'=S{
int j=stack[top--]; c-?2>%;(V
int i=stack[top--]; luPj'd?
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pivotIndex=(i+j)/2; xfAnZBsVo
pivot=data[pivotIndex]; |3ob1/)p0
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SortUtil.swap(data,pivotIndex,j); Zndv!z
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//partition Ms
*
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l=i-1; fWutB5?P
r=j; #.Q8q
do{ kim qm
while(data[++l] while((r!=0)&&(data[--r]>pivot)); N^Bjw?3
SortUtil.swap(data,l,r); [pAW' :
} ,m"0Bu2
while(l SortUtil.swap(data,l,r); e#R'_}\yj
SortUtil.swap(data,l,j); ]ULE>a
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if((l-i)>THRESHOLD){ O4l]Q
stack[++top]=i; G]NnGL<xk
stack[++top]=l-1; sTmY'5ry
} /E%r@Rui3$
if((j-l)>THRESHOLD){ 948 lL&
stack[++top]=l+1; K
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stack[++top]=j; :4HZ>!i
} KMU2PoqD
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} ZJZKCdT@
//new InsertSort().sort(data); 06r-@iY.]
insertSort(data); y,YK Mc
} i,3[0*ge
/** J/-&Fa\(
* @param data IN{ 1itE
*/ -JMlk:~
private void insertSort(int[] data) { j$%uip{
int temp; czp .q
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); K1*oYH B
} v \xuq`
} x!@ 3.$
}
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