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快速排序: BP6Shc|C
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package org.rut.util.algorithm.support; >UMnItq(l
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import org.rut.util.algorithm.SortUtil; =m:W
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/** K="+2]{I
* @author treeroot NS q=_8
* @since 2006-2-2 U ~m.I
* @version 1.0 0YL0Oa+7
*/ #7=LI\
public class QuickSort implements SortUtil.Sort{ St`m52V(5X
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/* (non-Javadoc) Q)>'fZ)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) EMG*8HRI>r
*/ ;j=1 oW
public void sort(int[] data) { -+>am?
quickSort(data,0,data.length-1); ui1m+
} jq)|Uq'6
private void quickSort(int[] data,int i,int j){ bed+Ur&
int pivotIndex=(i+j)/2; t3G'x1
//swap UZra'+Wb
SortUtil.swap(data,pivotIndex,j); $w\ , ."y
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int k=partition(data,i-1,j,data[j]); m##=iB|;
SortUtil.swap(data,k,j); 9:o3JGHSc
if((k-i)>1) quickSort(data,i,k-1); `t6L'%\
if((j-k)>1) quickSort(data,k+1,j); H[
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} @ni~ij
/** Ne
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* @param data }^7V^W
* @param i /3]|B%W9
* @param j ; \+0H$
* @return IJ;*N
*/ =Qrz|$_rv
private int partition(int[] data, int l, int r,int pivot) { x(=x;X$[^
do{ cmI#R1\
while(data[++l] while((r!=0)&&data[--r]>pivot); ub5hX{uT
SortUtil.swap(data,l,r); Vm.@qO*=
} Y=Qf!Cq]
while(l SortUtil.swap(data,l,r); W<"\hQI
return l; `'WLGQG
} Kf#!IY][
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} W+?[SnHL/
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改进后的快速排序: ,6"n5Ks}
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package org.rut.util.algorithm.support; "'Uk0>d=_I
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import org.rut.util.algorithm.SortUtil; Q%^bA,$&D
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/** mNoqs&UB
* @author treeroot ;!?K.,N:N
* @since 2006-2-2 o"[bIXf-h
* @version 1.0 ;4$C$r!t
*/ b_yXM
public class ImprovedQuickSort implements SortUtil.Sort { u,:`5*al{
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private static int MAX_STACK_SIZE=4096; NCt sx /C
private static int THRESHOLD=10; oE1]vX
/* (non-Javadoc) (p=GR#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R"`{E,yj
*/ :* b4/qpYv
public void sort(int[] data) { =fK'Ep[
int[] stack=new int[MAX_STACK_SIZE]; {LHe 6#
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int top=-1; X:&p9_O@
int pivot; 0z7mre^Q
int pivotIndex,l,r; 7"p s#)O
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stack[++top]=0; RI3{>|*
stack[++top]=data.length-1; ;bX
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while(top>0){ P1 stL,
int j=stack[top--]; F
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int i=stack[top--]; a<TL&
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pivotIndex=(i+j)/2; X@U1Ri
pivot=data[pivotIndex]; :<k|u!b}y
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SortUtil.swap(data,pivotIndex,j); 5l0rw)
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//partition 2EwWV0BS
l=i-1; k=2l9C3Z
r=j; Cf[F`pFM
do{ Gj`Y2X2r
while(data[++l] while((r!=0)&&(data[--r]>pivot)); cE5Zxcn
SortUtil.swap(data,l,r); Mk/!,N<h#
} h./vTNMc
while(l SortUtil.swap(data,l,r); )=nPM`Jn.
SortUtil.swap(data,l,j); E:=KH\2f
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if((l-i)>THRESHOLD){ E(kpK5h{
stack[++top]=i; SoU'r]k1x
stack[++top]=l-1; Pl&`&N;
} =v$s+`cP
if((j-l)>THRESHOLD){ YzW7;U
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stack[++top]=l+1; "UGj4^1f
stack[++top]=j; r5fkt>HZ
} Z !25xqNCd
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} p]z54 ~
//new InsertSort().sort(data); /3Ix,7
insertSort(data); Ny,A#-?
} MI'l4<>u
/** W<|K
* @param data tO>OD#
*/ H9Q7({v
private void insertSort(int[] data) { uf'P9MA}>
int temp; >"g<-!p@
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 8~(+[[TQ@
} >ydb?
} [=ak>>8
} [Pwo,L,)
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} Jo aDX ,
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