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快速排序: HYmUxheN2
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package org.rut.util.algorithm.support; ^tcBxDC"]
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import org.rut.util.algorithm.SortUtil; 2I7`
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/** RAbq_^Q
* @author treeroot k\%v;3nBK
* @since 2006-2-2 :Rj,'uH+h)
* @version 1.0 W(4?#lA2W
*/ ymX,k|lh
public class QuickSort implements SortUtil.Sort{ 4H)"d
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/* (non-Javadoc) -Ep6.v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \%Q
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*/ #zs\Z]3#
public void sort(int[] data) { 4PM`hc
quickSort(data,0,data.length-1); G@!9)v]9
} g^UWf <xp
private void quickSort(int[] data,int i,int j){ #'h CohL
int pivotIndex=(i+j)/2; r!,V_a4n
//swap 3*2pacHpE
SortUtil.swap(data,pivotIndex,j); U/o}{,$A
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int k=partition(data,i-1,j,data[j]); nn%xN\~<
SortUtil.swap(data,k,j); Qo *]l_UO;
if((k-i)>1) quickSort(data,i,k-1); !PIdw~YC
if((j-k)>1) quickSort(data,k+1,j); 5305N!
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} PzDgl6C
/** -V<"Ay
* @param data jloyJ@ck
* @param i {o%R~{6
* @param j )6+W6:
* @return L]<4{8H.
*/ rapca'
private int partition(int[] data, int l, int r,int pivot) { s9Z2EjQV
do{ ,0~TvJS
while(data[++l] while((r!=0)&&data[--r]>pivot); N&`ay{&`:
SortUtil.swap(data,l,r); 6E]rxps}"
} R,1 ,4XT
while(l SortUtil.swap(data,l,r); uK5x[m
return l; Mwc3@
} e*s{/a?,
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} 'v
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改进后的快速排序: )aSkUytg"
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package org.rut.util.algorithm.support; gwNkjI=,
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import org.rut.util.algorithm.SortUtil; vrbh+
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/** >O~5s.1u
* @author treeroot T<)z2Bi
* @since 2006-2-2 */E{s?
* @version 1.0 =YIQ
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*/ 55p=veq \
public class ImprovedQuickSort implements SortUtil.Sort { `0:@`)&g1
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private static int MAX_STACK_SIZE=4096; {8RGW0Y
private static int THRESHOLD=10; yk2j&}M
/* (non-Javadoc) :TI1tJS~*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8F1!9W7
*/ mM.&c5U
public void sort(int[] data) { =w-H )
int[] stack=new int[MAX_STACK_SIZE]; >qA&;M
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int top=-1; |=s3a5sl
int pivot; :f;|^(]"
int pivotIndex,l,r; aDuanGC/V
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stack[++top]=0; za7wNe(s
stack[++top]=data.length-1; K#r`^aUc
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while(top>0){ Di*>PE@
int j=stack[top--]; cDg27xOUi
int i=stack[top--]; plfB}p
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pivotIndex=(i+j)/2; 6EY4@0%A
pivot=data[pivotIndex]; 'Iu(lpF&
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SortUtil.swap(data,pivotIndex,j); 2uVm?nm
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//partition g 7X>i:
l=i-1; /
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r=j; FhGbQJ?[3
do{ {SV$fl;
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 1o%Hn"uG
SortUtil.swap(data,l,r); zlE kP @)
} 7(H/|2;-d8
while(l SortUtil.swap(data,l,r); t
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SortUtil.swap(data,l,j); bxs@_fH
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if((l-i)>THRESHOLD){ X*KT=q^?n
stack[++top]=i; *?{)i~
stack[++top]=l-1; M3%<kk-_
} ']Z8C)tK
if((j-l)>THRESHOLD){ t&_lpffv
stack[++top]=l+1; #'qW?8d}
stack[++top]=j; \Z8!iruN
} &3<]FK
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} _EP}el
//new InsertSort().sort(data); zw?6E8$h
insertSort(data); DcS~@ ;
} #u_-TWVt
/** r_G`#Z_5F
* @param data eW/Hn
*/ _N6GV$Q
private void insertSort(int[] data) { ",a
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int temp; M5]wU
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); xQQ6D
} 2.yzR DfZ
} 5s;#C/ZZ
} Ne%X:h
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} #]rw@c
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