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快速排序: (N7uaZ?Z
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package org.rut.util.algorithm.support; qCV<-o
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import org.rut.util.algorithm.SortUtil; S#7YJ7
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/** ^"WVE["
* @author treeroot 0!T`.UMI
* @since 2006-2-2 c0qp-=^&.
* @version 1.0 $ik*!om5
*/ !%iHJwS#
public class QuickSort implements SortUtil.Sort{ E
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/* (non-Javadoc) ZK5nN9`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S+ kq1R
*/ )cqD"> vs
public void sort(int[] data) { CU'JvVe3
quickSort(data,0,data.length-1); l~c[} wv
} CMa6':~
private void quickSort(int[] data,int i,int j){ ~r1pO#r-
int pivotIndex=(i+j)/2; &Y{^yb
//swap }LzBo\
SortUtil.swap(data,pivotIndex,j); {.p.?
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int k=partition(data,i-1,j,data[j]); J2YQdCL
SortUtil.swap(data,k,j); z3oi(
if((k-i)>1) quickSort(data,i,k-1); 3k Ci5C
if((j-k)>1) quickSort(data,k+1,j); (l{vlFWd
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} 5E]t4"
/** b;k+N`
* @param data YW7W6mWspS
* @param i ,>GHR{7>(
* @param j ~b f\fPm
* @return J:xGEa t
*/ dY*q[N/pO
private int partition(int[] data, int l, int r,int pivot) { [q<'ty
do{ kv+%
while(data[++l] while((r!=0)&&data[--r]>pivot); sV\_DP/l
SortUtil.swap(data,l,r); Gt w>R
} $Ome]+0
while(l SortUtil.swap(data,l,r); c8l>OS5i3_
return l; *FlPGBjJ
} "6B7EH
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} -@orIwA&
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改进后的快速排序: w5@5"M
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package org.rut.util.algorithm.support; z/@_?01T=
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import org.rut.util.algorithm.SortUtil; g@.$P>Bh
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/** h9vcN#22D
* @author treeroot K7
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* @since 2006-2-2 [a=exK
* @version 1.0 |Splbsk
*/ %opBJ
public class ImprovedQuickSort implements SortUtil.Sort { xoaO=7\io
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private static int MAX_STACK_SIZE=4096; f6Qr0Op
private static int THRESHOLD=10; i"8mrWb
/* (non-Javadoc) [>=!$>>;8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _plK(g-1J%
*/ -d ntV=
public void sort(int[] data) { }z3j7I
int[] stack=new int[MAX_STACK_SIZE]; g'0CYY
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int top=-1; >Vuvbo
int pivot; x#rgFY,TY
int pivotIndex,l,r; dP5x]'"x
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stack[++top]=0; NvR{S /Z
stack[++top]=data.length-1; (O.%Xbx3
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while(top>0){ VF]AH}H8I
int j=stack[top--]; )*')
int i=stack[top--]; 7Cgi&
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pivotIndex=(i+j)/2; ^^y eC|~N:
pivot=data[pivotIndex]; fgLjF,Y
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SortUtil.swap(data,pivotIndex,j); / 3A6xPOg
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//partition OM*_%UF
l=i-1; ua\t5M5
r=j; kaG/8G(
do{ 3h@]cWp
while(data[++l] while((r!=0)&&(data[--r]>pivot)); FDHW'OP4
SortUtil.swap(data,l,r); ^t>mdxuq
} LPk@t^[
while(l SortUtil.swap(data,l,r); l_B735
SortUtil.swap(data,l,j); z>x@o}#u\|
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if((l-i)>THRESHOLD){ ]9@:7d6
stack[++top]=i; *S$vSDJCW
stack[++top]=l-1; C2
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} c9(3z0!F?
if((j-l)>THRESHOLD){ ]
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stack[++top]=l+1;
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stack[++top]=j; ! 'zd(kv<
} 6j#JhcS+
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} >{#JIG.
//new InsertSort().sort(data); %#6@PQ[R.
insertSort(data); fFQ|dE;cF
} TlG>)Z@/
/** b#j:)PA0C
* @param data 2HbnE&
*/ Di9RRHn&q
private void insertSort(int[] data) { kA:Y^2X'
int temp; [Nyt0l "z
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); $d?+\r:I{,
} 2q
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} @gUp9ZwtH
} U,P_bz*)
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} [4)Oi-_Y>
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