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快速排序: 4X/UyBk
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package org.rut.util.algorithm.support; =NY55t.
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import org.rut.util.algorithm.SortUtil; 7T6Zlp
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/** &L+.5i
* @author treeroot W,H8B%e
* @since 2006-2-2 'nM4t
* @version 1.0 R@pY+d9qp
*/ <FU?^*~
public class QuickSort implements SortUtil.Sort{ 5rbb
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/* (non-Javadoc) uJH[C>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $+n6V2^K)7
*/ eC%Skw
public void sort(int[] data) { u_+iH$zA
quickSort(data,0,data.length-1); U+>M@!=
} ,m]5j_< }
private void quickSort(int[] data,int i,int j){ RjvW*'2G
int pivotIndex=(i+j)/2; ^Y+C!I
//swap y9d"sqyh
SortUtil.swap(data,pivotIndex,j); l"}_+5
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int k=partition(data,i-1,j,data[j]); "OwVCym?
SortUtil.swap(data,k,j); 7p]Izx8][
if((k-i)>1) quickSort(data,i,k-1); d,l?{Ln
if((j-k)>1) quickSort(data,k+1,j); <,GVrVH=t"
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} \B84
/** K.mxF,H
* @param data _9 '_w&
* @param i @j}%{Km]Y
* @param j 4LB8p7$|a3
* @return LOi}\O8
*/ ,I5SAd|dX
private int partition(int[] data, int l, int r,int pivot) { =HsE:@
do{ J@$~q}iG
while(data[++l] while((r!=0)&&data[--r]>pivot); 0stc$~~v
SortUtil.swap(data,l,r); /A-WI x
} 7LrmI~P
while(l SortUtil.swap(data,l,r); Rb0I7~Z%'d
return l; 9!uiQ
} io+V4m
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改进后的快速排序: &LAXNk2
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package org.rut.util.algorithm.support; ?BfE*I$\h
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import org.rut.util.algorithm.SortUtil; R'tKJ_VI
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/** ^
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* @author treeroot 'v V7@@
* @since 2006-2-2 :+PE1=v
* @version 1.0 <8^x
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*/ p8!T)
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public class ImprovedQuickSort implements SortUtil.Sort { .M^[/!
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private static int MAX_STACK_SIZE=4096; <R /\nY Xz
private static int THRESHOLD=10; bu]"?bc
/* (non-Javadoc) '&![h7B
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *$<W"@%^J
*/ G*@!M%/
public void sort(int[] data) { _rwJ:r
int[] stack=new int[MAX_STACK_SIZE]; 9dhEQ=K{3
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int top=-1; |]*3En:
int pivot; m|aK_
int pivotIndex,l,r; =+!l8o&o,
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stack[++top]=0; cl%+m
stack[++top]=data.length-1; LTTMa-]Yy
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while(top>0){ EsMX#1>/m
int j=stack[top--]; 4a-JC"
int i=stack[top--]; kUf i
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pivotIndex=(i+j)/2; IW0S*mO$
pivot=data[pivotIndex]; Dw%'u'HG
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SortUtil.swap(data,pivotIndex,j); >[fu&r1
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//partition 0ra'H/>Ly
l=i-1; KC6Cg?y^
r=j; Q\N*)&Sd<M
do{ \wK&wRn)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <&3P\aM>
SortUtil.swap(data,l,r); @Vre)OrN#
} UTD_rQ
while(l SortUtil.swap(data,l,r); E~%n-A
SortUtil.swap(data,l,j); GJeG7xtJKl
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if((l-i)>THRESHOLD){ r/j:A#6M]o
stack[++top]=i; [7Lr"
stack[++top]=l-1; ?b;2PH"
} !D#"+&&G8
if((j-l)>THRESHOLD){ .[Sis<A]%
stack[++top]=l+1; [.gk{> #
stack[++top]=j; 9TW[;P2> )
} 4S<M9A}
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} 1<YoGm&
//new InsertSort().sort(data); _K^Q]V[nZ
insertSort(data); Q(bOar5
} xyp{_ MZ
/** mmTpF]t
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* @param data *F\wWg'!B
*/ ,;$OaJFT
private void insertSort(int[] data) { \^!;r 9z=A
int temp; vK',!1]y
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); B9maz"lJ
} `6Bx8CZ'I
} vO}r(kNJ
} v e&d"8+]
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} 'f5
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