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快速排序: ,!?&LdPt>
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package org.rut.util.algorithm.support; "`AIU}[_I
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import org.rut.util.algorithm.SortUtil; E|jbbCZy2
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/** OJL?[<I
* @author treeroot (Wu_RXfCw_
* @since 2006-2-2 OBCRZ
* @version 1.0 'bpx
*/ ytX XZ`
public class QuickSort implements SortUtil.Sort{ "=uphBZog
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/* (non-Javadoc) +8 avA:o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OJUH".o
*/ H *gF>1
public void sort(int[] data) { m%-
quickSort(data,0,data.length-1); %hzl3>().
} 8uR4ZE*
private void quickSort(int[] data,int i,int j){ p}j$p'D.RI
int pivotIndex=(i+j)/2; a~_5N&~pi
//swap p<\yp<g
SortUtil.swap(data,pivotIndex,j);
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int k=partition(data,i-1,j,data[j]); c:Tw.WA
SortUtil.swap(data,k,j); bojx:g
if((k-i)>1) quickSort(data,i,k-1); u:Q_XXT5
if((j-k)>1) quickSort(data,k+1,j); -o\r]24
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} fT-yY`
/** AKVll
* @param data D_%y&p?<Ls
* @param i |RBgJkS;8
* @param j 6_a42#
* @return ON{&-
*/ Q]7Rqslz
private int partition(int[] data, int l, int r,int pivot) { 7dXR/i \
do{ 2-9'zN0u
while(data[++l] while((r!=0)&&data[--r]>pivot); URq{#,~CT
SortUtil.swap(data,l,r); YPraf$
} 15i8) 4h
while(l SortUtil.swap(data,l,r); SbmakNWJ}
return l; cNzn2-qv
} iEG`+h'
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} ,4hQ#x
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改进后的快速排序: 5Uc!;Gd?b
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package org.rut.util.algorithm.support; v7+f@Z:N*
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import org.rut.util.algorithm.SortUtil; Z[Gs/D
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/** s7?Q[vN
* @author treeroot FpjpsD~Qu
* @since 2006-2-2 Y4]USU!PA
* @version 1.0 ENwDW#U9
*/ }v[*V
public class ImprovedQuickSort implements SortUtil.Sort { %UuV^C
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private static int MAX_STACK_SIZE=4096; Hf( d x\5
private static int THRESHOLD=10; P8jXruZr
/* (non-Javadoc) u?[dy
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J>(I"K%
*/ -7:J#T/\
public void sort(int[] data) { {FO>^~>l
int[] stack=new int[MAX_STACK_SIZE]; |tC`rzo
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int top=-1; =p 9d4smbn
int pivot; Gma)8X#
int pivotIndex,l,r; ;0Yeo"-
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stack[++top]=0; RkVU^N"
stack[++top]=data.length-1; : E`N0UA
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while(top>0){ Wb:jZ
int j=stack[top--]; rtr0 d
int i=stack[top--]; 'ojI_%9<
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pivotIndex=(i+j)/2; {64od0:T
pivot=data[pivotIndex]; 3dG[dYj
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SortUtil.swap(data,pivotIndex,j); F%!ZHE7
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//partition j8*fa
l=i-1; pj. }VF!d
r=j; m\~{l=jIS
do{ E"7 iU
while(data[++l] while((r!=0)&&(data[--r]>pivot)); FBpf_=(_1
SortUtil.swap(data,l,r); 1*aw~nY0
} zmvF#o
while(l SortUtil.swap(data,l,r); }ie\-V
SortUtil.swap(data,l,j);
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if((l-i)>THRESHOLD){ MY11 5%
stack[++top]=i; AL%H$ I
stack[++top]=l-1; D~W1["[
} o@6:|X)7
if((j-l)>THRESHOLD){ I%]L
stack[++top]=l+1; W|_^Oe<
stack[++top]=j; ^ mbpt`@
} J{"<Hgb
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} z>$AZ>t%J$
//new InsertSort().sort(data); SB
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insertSort(data); _Wn5*
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} c}K>#{YeB
/** N0EJHS,>e
* @param data >(Mu9ie*`
*/ 8w &