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快速排序: ]5c|
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package org.rut.util.algorithm.support; 76xgExOU?C
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import org.rut.util.algorithm.SortUtil; MwXgaSV
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/** /ZX8gR5x
* @author treeroot dDAdZxd
* @since 2006-2-2 iQ~cG[6
* @version 1.0 (,HAOs
*/
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public class QuickSort implements SortUtil.Sort{ yU&A[DZQ
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/* (non-Javadoc) CfA
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S =eP/
*/ *9*6n\~aI
public void sort(int[] data) { ">NBPanJ
quickSort(data,0,data.length-1); 'Zk&AD ~
} n6
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private void quickSort(int[] data,int i,int j){ ptYQP^6S[
int pivotIndex=(i+j)/2; 7-bU9{5
//swap Yr!<O&=
SortUtil.swap(data,pivotIndex,j); wN"irXG
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int k=partition(data,i-1,j,data[j]); BwrMRMq"
SortUtil.swap(data,k,j); tHD
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if((k-i)>1) quickSort(data,i,k-1); <"aPoGda
if((j-k)>1) quickSort(data,k+1,j); #>[+6y]U!
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} i7:j(W^I8
/** no^I![_M
* @param data 9
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* @param i Va?wG3 w
* @param j znX2W0V
* @return L<5go\!bV
*/ CQ6Z[hLWF
private int partition(int[] data, int l, int r,int pivot) { '0z@Jevd?
do{ 8M8=uw~#
while(data[++l] while((r!=0)&&data[--r]>pivot); P7<~S8)Y
SortUtil.swap(data,l,r); w9l)=[s=
} MvJEX8M
while(l SortUtil.swap(data,l,r); b[VP"KZ ?
return l; WRL &tz
} #W'jNX,h
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改进后的快速排序: 3x.|g
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package org.rut.util.algorithm.support; a{,EX[~b
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import org.rut.util.algorithm.SortUtil; VI[ikNpX
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/** <JDkvpckx.
* @author treeroot ,`)!K}2
* @since 2006-2-2 Sh}AGNE'
* @version 1.0 GYyP+7K4l[
*/ r4D6g>)h1q
public class ImprovedQuickSort implements SortUtil.Sort { l^WFMeMD3a
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private static int MAX_STACK_SIZE=4096; )#M*@e$k
private static int THRESHOLD=10; Ga"$_DyM
/* (non-Javadoc) jo0p/5;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) pX*Oc6.0mu
*/ KKl8tI\u~
public void sort(int[] data) { 0:Ak4L6k
int[] stack=new int[MAX_STACK_SIZE]; fLxFF
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int top=-1; iVREkZ2SC
int pivot; /DJyNf*
int pivotIndex,l,r; N@)tU;U3O
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stack[++top]=0; &=xm>;`3
stack[++top]=data.length-1; cdf8YN0!
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while(top>0){ r[JgCj+$&
int j=stack[top--]; BoHMz/DB
int i=stack[top--]; (KK9/k
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pivotIndex=(i+j)/2; Ks{^R`Oau
pivot=data[pivotIndex]; )1Z*kY?f!
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SortUtil.swap(data,pivotIndex,j); |*e
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//partition {xMY2I++
l=i-1; 1wi{lJaz
r=j; w*f.Fu(su
do{ $
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); KaZ$!JfT
SortUtil.swap(data,l,r); 3z!\Z[
} BJ @tUn
while(l SortUtil.swap(data,l,r); bH~ue5q
SortUtil.swap(data,l,j); v;80RjPy>
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if((l-i)>THRESHOLD){ BI3Q~ADV
stack[++top]=i; )R<hYd
stack[++top]=l-1; XA-DJ
} +q|2j>k@
if((j-l)>THRESHOLD){ Q+U}
stack[++top]=l+1; %mAgE\y25
stack[++top]=j; l+*^P'0u
} ?R&,1~h
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} o=X6PoJN_
//new InsertSort().sort(data); 2n2{Oy>L
insertSort(data); 1t
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} ^EPM~cEY\
/** tT ~}lW)Y
* @param data [kDjht|$>
*/ >c|u|^3zt
private void insertSort(int[] data) { -y1%c^36_J
int temp; $21+6
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); _O
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} AhZ8B'Ee
} |-bSoq7t
} cP''
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} b?hdWQSW7
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