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快速排序: Qd{h3K^hlu
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package org.rut.util.algorithm.support; Q9[$8
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import org.rut.util.algorithm.SortUtil; "G(^v?x:P
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/** !,I530eh7
* @author treeroot aDae0$lc.S
* @since 2006-2-2 P ]prrKZe,
* @version 1.0 f`[gRcZ-
*/ KBb{Z;%
public class QuickSort implements SortUtil.Sort{ %+1;iuDL
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/* (non-Javadoc) b6LwKUl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B!z-O*fLE1
*/ )=PmHUd
public void sort(int[] data) { !6d6b@Mv
quickSort(data,0,data.length-1); 1z#0CX}Y/H
} dV:vM9+x
private void quickSort(int[] data,int i,int j){ f<Co&^A
int pivotIndex=(i+j)/2; Uc?4!{$X
//swap
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SortUtil.swap(data,pivotIndex,j); ]Zj6W9]m
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int k=partition(data,i-1,j,data[j]); #Fl5]> |
SortUtil.swap(data,k,j); *1>zE>nlP
if((k-i)>1) quickSort(data,i,k-1); Bl
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if((j-k)>1) quickSort(data,k+1,j); s--\<v
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} Py3Y*YP
/** 0VA$
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* @param data o|FY-+
* @param i 2f=7`1RCD
* @param j Y(`# J[
* @return V&j
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*/ /=|5YxY
private int partition(int[] data, int l, int r,int pivot) { %)|_&Rh
do{ qM|-2Zl!+
while(data[++l] while((r!=0)&&data[--r]>pivot); cSkJlhwNn
SortUtil.swap(data,l,r); }'FNGn.~#
} C8J3^?7E
while(l SortUtil.swap(data,l,r); >`@c9
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return l; //ZYN2lT4
} z;74(5?q
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} ZRjqjx
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改进后的快速排序: D+y_&+&,t
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package org.rut.util.algorithm.support; 8:iu 8c$
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import org.rut.util.algorithm.SortUtil; T9N&Nh7 3
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/** IO(Y_7
* @author treeroot RyxEZ7dC<y
* @since 2006-2-2 ~MgU"P>
* @version 1.0 e/h2E dY
*/ ?;//%c8,.
public class ImprovedQuickSort implements SortUtil.Sort { w(y#{!%+
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private static int MAX_STACK_SIZE=4096; X+:>&&9
private static int THRESHOLD=10; W/U_:^[-
/* (non-Javadoc) +Y:L4`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d+6 by,'
*/ $c WO`\XM
public void sort(int[] data) { ~(|~Ze>
int[] stack=new int[MAX_STACK_SIZE]; 2K8?S
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int top=-1; e-taBrl;
int pivot; kH)JBx.
int pivotIndex,l,r; GmA5E
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stack[++top]=0; iTt#%Fs)4M
stack[++top]=data.length-1; e^Ds|}{V
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while(top>0){ A(xCW+h@)
int j=stack[top--]; Gob;dku
int i=stack[top--]; `$X|VAS2
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pivotIndex=(i+j)/2; xSQ0] vE
pivot=data[pivotIndex]; q0}?F
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SortUtil.swap(data,pivotIndex,j); WdA6Y
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//partition m-~eCFc
l=i-1; (f5v{S6b(
r=j; l<](8oc.
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do{ X@ljZ
while(data[++l] while((r!=0)&&(data[--r]>pivot)); CQq'x+{F
SortUtil.swap(data,l,r); Tz=YSQy$9
} "/EE$eU
while(l SortUtil.swap(data,l,r); *L%i-Wg"
SortUtil.swap(data,l,j); B>^5h?(lt
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if((l-i)>THRESHOLD){ )A`Zgg'L7D
stack[++top]=i; ]Tje6iF
stack[++top]=l-1; gAx8r-` `
} U2 tsHm.O
if((j-l)>THRESHOLD){
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stack[++top]=l+1; pvz*(u
stack[++top]=j; yrDWIU(8;6
} >};6>)0
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} u#+p6%?k
//new InsertSort().sort(data); $Qm-p?f
insertSort(data); -zeodv7
} j15TavjGh
/** ^UF]%qqOn
* @param data fs]9H K/@\
*/ E0 nR Vg
private void insertSort(int[] data) { V/0?0VKG
int temp; IH$R XGL
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Y:nF.An3
} =jik33QV<
} q4k)E
} ]~,V(K
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} "EoC7
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