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快速排序: fn?VNZ`J
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package org.rut.util.algorithm.support; |<2
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import org.rut.util.algorithm.SortUtil; ~1d!hq?/q
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/** zze z~bv7:
* @author treeroot 8vO;IK]9b^
* @since 2006-2-2 -Qg,99M
* @version 1.0 wzxdVn
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*/ E4i@|jE~)
public class QuickSort implements SortUtil.Sort{ `+fk`5Y
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/* (non-Javadoc) l<n5gfJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1 Xa+%n9
*/ wVQdUtmk
public void sort(int[] data) { ,$PFI(Whk
quickSort(data,0,data.length-1); $Br>KJ%'g
} a G@nErdW
private void quickSort(int[] data,int i,int j){ yYB NH1
int pivotIndex=(i+j)/2; A8mlw#`E8b
//swap p}f-c
SortUtil.swap(data,pivotIndex,j); /o\U/I
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int k=partition(data,i-1,j,data[j]); 7
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SortUtil.swap(data,k,j); y-<$bA[K~
if((k-i)>1) quickSort(data,i,k-1); uNg'h/^NZ|
if((j-k)>1) quickSort(data,k+1,j); Vbo5`+NAis
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} [tOuNj:
/** k~R{Y~W!!
* @param data 'hy?jQ'|e
* @param i $59nu7yr
* @param j a0{[P$$
* @return v*vn<nPAQ>
*/ p}&Md-$1
private int partition(int[] data, int l, int r,int pivot) { y]<#%Fh
do{ Wge ho
while(data[++l] while((r!=0)&&data[--r]>pivot); hRRkFz/0&
SortUtil.swap(data,l,r); O%prD}x
} NA=#>f+U%
while(l SortUtil.swap(data,l,r); x!`b'U\
return l; A1=_nt)5
} zw,-.fmM#
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} [u7 vY@
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改进后的快速排序: Y>G*'[U
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package org.rut.util.algorithm.support; (Hl8U
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import org.rut.util.algorithm.SortUtil; Y+5"uq<'
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/** 487YaioB$
* @author treeroot </|)"OD9
* @since 2006-2-2 XzW7eO,A
* @version 1.0 .uBO
*/ =?HzNA$yh
public class ImprovedQuickSort implements SortUtil.Sort { &;Ed*OJ
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private static int MAX_STACK_SIZE=4096; TR~|c|B
private static int THRESHOLD=10; u0s'6=
/* (non-Javadoc) m$,cH>E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) WN$R[N
*/ RZW$!tyI=
public void sort(int[] data) { %3rTQ:X
int[] stack=new int[MAX_STACK_SIZE]; r)OO&. P@j
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int top=-1; 6k:y$,w
int pivot; IKGTsA;
int pivotIndex,l,r; tp%|AD"
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stack[++top]=0; I88Zrhw
stack[++top]=data.length-1; KS
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while(top>0){ Q,D0kS P
int j=stack[top--]; <{E;s)hD?
int i=stack[top--]; J6eJIKK
w2 /* `YO
pivotIndex=(i+j)/2; g})6V
pivot=data[pivotIndex]; '!Hhd![\=|
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SortUtil.swap(data,pivotIndex,j); qZXyi'(d
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//partition P`p6J8}4
l=i-1; vc )9Re$
r=j; Cca6L9%
do{ G4O,^ v;Q
while(data[++l] while((r!=0)&&(data[--r]>pivot)); C/CN
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SortUtil.swap(data,l,r); kxygf9I!;
} qx Wgt(Os
while(l SortUtil.swap(data,l,r); IY V-*/
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SortUtil.swap(data,l,j); $4DFgvy$
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if((l-i)>THRESHOLD){ Z"-ntx#
stack[++top]=i; 4pLQ"&>}80
stack[++top]=l-1; f( ]R/'o
} 4g>1Gqv6
if((j-l)>THRESHOLD){ jo<>Hc{g>
stack[++top]=l+1; `E{;85bDH
stack[++top]=j; anK[P'Y
} ZEL/Ndk
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} qo61O\qm
//new InsertSort().sort(data); m~##q}LZ
insertSort(data); v>rqOI
} *4-r`k|@>/
/** sP9 ^IP
* @param data 7X(rLd
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*/ MhHr*!N"}
private void insertSort(int[] data) { 4,j4E@?pG9
int temp; tDEXm^B2Sv
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 9cVn>Fb
} Km[]^;6
} Y=5!QLV4
} w}IL
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} \H,V 9!B
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