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快速排序: Gw^=kzh
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package org.rut.util.algorithm.support; P%HyIODS
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import org.rut.util.algorithm.SortUtil; }yDq\5s
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/** l>Ja[`X@
* @author treeroot y4rJ-
* @since 2006-2-2 Z3>3&|&
* @version 1.0 PJ:5Lb<
*/ $ywh%OEH
public class QuickSort implements SortUtil.Sort{ +N:6wZ7<f
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/* (non-Javadoc) ]},Q`n>$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J&65B./mD9
*/ 1e&b;l'*=
public void sort(int[] data) { ![ID0}MjJ
quickSort(data,0,data.length-1); -Bv1}xf=6
} I} fcFL8
private void quickSort(int[] data,int i,int j){ FKnQwX.0
int pivotIndex=(i+j)/2; <D;Q8
//swap bu]Se6%}
SortUtil.swap(data,pivotIndex,j); X3iRR{< @
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int k=partition(data,i-1,j,data[j]); h=r<
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SortUtil.swap(data,k,j); '4lT*KN7\
if((k-i)>1) quickSort(data,i,k-1); wf<`J/7u
if((j-k)>1) quickSort(data,k+1,j); yPG\ &Bo
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} >@"3Q`
/** [3sxzU!t~
* @param data TxxB0
* @param i / !
* @param j 0*/ r'
* @return T^;Jz!e
*/ ss@}Dt^
private int partition(int[] data, int l, int r,int pivot) {
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do{ lWw!+[<:q1
while(data[++l] while((r!=0)&&data[--r]>pivot); u m2s^G
SortUtil.swap(data,l,r); C"Q=(3
} (i0"hi
while(l SortUtil.swap(data,l,r); \ +-hn
return l; zn;Hs]G
} $o$Ev@mi
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} P|P fG=
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改进后的快速排序: _6S
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package org.rut.util.algorithm.support; $F`<&o
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import org.rut.util.algorithm.SortUtil; akc"}+-oX
r,@X>_}
/** 2G}7R5``9
* @author treeroot 4[CBW
* @since 2006-2-2 \g:qQ*.
* @version 1.0 fy=C!N&/
*/ Fp6[W5>(-
public class ImprovedQuickSort implements SortUtil.Sort { +'Y(V&
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private static int MAX_STACK_SIZE=4096; =
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private static int THRESHOLD=10; %OTA5
/* (non-Javadoc) d7tD|[(J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SAE'?_
*/ 8xpYQ<cax
public void sort(int[] data) { NRuG?^/}d
int[] stack=new int[MAX_STACK_SIZE]; #[0\=B-
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int top=-1; )C01fZhD
int pivot; L8w76|
int pivotIndex,l,r; E,D:D3O
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stack[++top]=0; ,dj*p,J
stack[++top]=data.length-1; CVSsB:H6e
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while(top>0){ BXK::M+
int j=stack[top--]; Ril21o! j
int i=stack[top--]; &Wz`>qYL*
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pivotIndex=(i+j)/2; n:^"[Le
pivot=data[pivotIndex]; 5ih"Nds[H
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SortUtil.swap(data,pivotIndex,j); #C,f/PXfaB
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//partition 3+8"
l=i-1; ,+f0cv4
r=j; ZYA.1VrM
do{ 7=p-A_X
while(data[++l] while((r!=0)&&(data[--r]>pivot)); m!#)JFe67
SortUtil.swap(data,l,r); M$]O=2h+2
} B`?N0t%X
while(l SortUtil.swap(data,l,r); rv%ye
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SortUtil.swap(data,l,j); x#j\"$dla
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if((l-i)>THRESHOLD){ PZ!dn%4jy
stack[++top]=i; #?$'nya*u
stack[++top]=l-1; X#kjt)W
} I~]Q55
if((j-l)>THRESHOLD){ u_6BHsU
stack[++top]=l+1; DNW2;i<hsz
stack[++top]=j; B/sBYVU
} 3b?OW7H
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} }rY?=I
//new InsertSort().sort(data); J%\~<_2ny
insertSort(data); x'@32gv
} +i`Q 7+d
/** -#S)}NEn
* @param data 8G5)o`
*/ Nr]8P/[~
private void insertSort(int[] data) { )pZekh]v
int temp; ANFg]g.Az
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); .?i-rTF:
} C'8!cPFVv
} n(Q\',C
} sR>`QIi(a
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} &G
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