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快速排序: Q ,`R-?v
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package org.rut.util.algorithm.support; c*@#0B
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import org.rut.util.algorithm.SortUtil; !EuqJjh
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/** !Z}d^$
* @author treeroot C 7a$>#%
* @since 2006-2-2 Nr(t5TP^
* @version 1.0 Rn4Bl8z'>
*/ 70MSP;^
public class QuickSort implements SortUtil.Sort{ ?nwFc3qw
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/* (non-Javadoc) <aPbKDF~V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~Q3y3,x
*/ tW8&:L,m
public void sort(int[] data) { nF#1B4b>
quickSort(data,0,data.length-1); ' ~F
} oLh2:c
private void quickSort(int[] data,int i,int j){ |u@/,x/t
int pivotIndex=(i+j)/2;
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//swap y+"6Y14
SortUtil.swap(data,pivotIndex,j); ox&PFI0Gn
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int k=partition(data,i-1,j,data[j]); bZKlQ<sI
SortUtil.swap(data,k,j); \$B%TY
if((k-i)>1) quickSort(data,i,k-1); IHs^t/;Iv
if((j-k)>1) quickSort(data,k+1,j); p7{%0
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} Fs}vI~}
/** N,?4,+Hc-
* @param data |Vj@;+/j
* @param i u;/5@ADW
* @param j D00v"yp%%
* @return .G~Y`0
*/ G oHdhne3
private int partition(int[] data, int l, int r,int pivot) { m,X8Cy|vQ
do{ (=eJceE!
while(data[++l] while((r!=0)&&data[--r]>pivot); Hdxon@,+cd
SortUtil.swap(data,l,r); t)__J\xF
} \kS:u}Ip!
while(l SortUtil.swap(data,l,r); p\).zuEf.
return l; U{[ g"_+~
} 1<(('H
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} |~d8j'rt
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改进后的快速排序: IJQ"
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package org.rut.util.algorithm.support; W3M1> (
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import org.rut.util.algorithm.SortUtil; q,%lG$0v
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/** YA:!ULzR*
* @author treeroot O}Mu_edM
* @since 2006-2-2 j0q:i}/U,
* @version 1.0 ] i:WP2
*/ |J^}BXW'^)
public class ImprovedQuickSort implements SortUtil.Sort { 41XS/# M$*
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private static int MAX_STACK_SIZE=4096; +aoenUm5
private static int THRESHOLD=10; ,u@Vi0
/* (non-Javadoc) RqU^Q*/sF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <oKoz0!
*/ 1{Kv
public void sort(int[] data) { BTAt9Z8qK
int[] stack=new int[MAX_STACK_SIZE]; l+XTn;cS
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int top=-1; LLD#)Jl{?
int pivot; jnzOTS
int pivotIndex,l,r; EpUBO}q]
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stack[++top]=0; k"$E|$
stack[++top]=data.length-1; MY w3+B+Jj
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while(top>0){ I3^}$#>
int j=stack[top--]; YW7Pimks
int i=stack[top--]; ;%a
);!IGcgF
pivotIndex=(i+j)/2; HS@ EV iht
pivot=data[pivotIndex]; ; nc3O{rU
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SortUtil.swap(data,pivotIndex,j); u.rFZu?E\
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//partition 6qK`X
l=i-1; qx f8f
r=j; %/}46z9\
do{ EGw;IFj)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); i1JVvNMQ,
SortUtil.swap(data,l,r); h]>7Dl]
} 9NC?J@&B
while(l SortUtil.swap(data,l,r); +cwuj
SortUtil.swap(data,l,j); ?8!\V NC.
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if((l-i)>THRESHOLD){ qq'%9
stack[++top]=i; ! z6T_;s
stack[++top]=l-1; nw,XA0M3
} =Y
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if((j-l)>THRESHOLD){ yN{TcX
stack[++top]=l+1; wzf
stack[++top]=j; bZlKy`Z
} XP^[,)E
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} t|?eNKVV9'
//new InsertSort().sort(data); 1"S~#
insertSort(data);
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} GQ\;f
/** C+%6N@
* @param data }!QVcu"+t/
*/ ksy]t|
private void insertSort(int[] data) { BFswqp:
int temp; HlOn=>)<
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ?+G
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} '1"vwXJ"
} o@[oI\Vr!
} C;I:?4
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} 61Wh %8-
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