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快速排序: q:a-tdv2
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package org.rut.util.algorithm.support; P7D__hoE
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import org.rut.util.algorithm.SortUtil; ,B8u?{O
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/** 8{)j"rghah
* @author treeroot l1#F1q`^t
* @since 2006-2-2 }T1.~E
* @version 1.0 FA7q
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*/ U,7O{YM
public class QuickSort implements SortUtil.Sort{ 4Uzx2
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/* (non-Javadoc) `-)Hot)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1n-+IR"
*/ FofeQ
public void sort(int[] data) { W^8MsdM
quickSort(data,0,data.length-1); ^=.QQo||B
} 8%Eemk >G{
private void quickSort(int[] data,int i,int j){ bZf}m=C!
int pivotIndex=(i+j)/2; W^" C|4G }
//swap 1wTPT,k
SortUtil.swap(data,pivotIndex,j); u!@(u!Qz
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int k=partition(data,i-1,j,data[j]); J)n^b
SortUtil.swap(data,k,j); Ef2i#BoZ
if((k-i)>1) quickSort(data,i,k-1); sn-P&"q
if((j-k)>1) quickSort(data,k+1,j); ms/!8X$Mz
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} +DwE~l
/** J2avt
* @param data #C#*yE
* @param i u [Dz~
* @param j >HL$=J_K?
* @return @CNe)&U
*/ 8m"(T-wb6{
private int partition(int[] data, int l, int r,int pivot) { {\p&?
do{ ;&OVV+y
while(data[++l] while((r!=0)&&data[--r]>pivot); ttfCiP$
SortUtil.swap(data,l,r);
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} Q4e+vBECkq
while(l SortUtil.swap(data,l,r); 2Y1y;hCK
return l; p{0NKyOvU
} X')t6DQ( I
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} GJj} |+|
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改进后的快速排序: :/XWk
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package org.rut.util.algorithm.support; 5v_vv'~
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import org.rut.util.algorithm.SortUtil; o~`KOe
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/** d3jzGJrU}
* @author treeroot ?, m_q+
* @since 2006-2-2 5Ei4$T
* @version 1.0 r(OH
*/ 'aqlNBG*
public class ImprovedQuickSort implements SortUtil.Sort { q#_<J1)z
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private static int MAX_STACK_SIZE=4096; _h^er+d!_
private static int THRESHOLD=10; ';zS0Yk
/* (non-Javadoc) PFI^+';
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %@MO5#)NI
*/ Lu5lpeSQ
public void sort(int[] data) { *|({(aZ
int[] stack=new int[MAX_STACK_SIZE]; }F4%5go
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int top=-1; =HHtLW.|,
int pivot; hEMS
int pivotIndex,l,r; Ev]oPCeA
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stack[++top]=0; AOv>O52F/Q
stack[++top]=data.length-1; moCr4*jDX,
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while(top>0){ ZO8r8
[
int j=stack[top--]; ["0DXm%t
int i=stack[top--]; iT=h}>
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pivotIndex=(i+j)/2; )~be<G( a
pivot=data[pivotIndex]; &|I{ju_
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SortUtil.swap(data,pivotIndex,j); 1qm
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//partition o7kQ&w
l=i-1; #ja6nt8GC
r=j; J*D3=5&
do{ l&{+3 aC:
while(data[++l] while((r!=0)&&(data[--r]>pivot)); @B9O*x+n:
SortUtil.swap(data,l,r); Pj^O8
} Y$0K}`{
while(l SortUtil.swap(data,l,r); [oG
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SortUtil.swap(data,l,j); "?S>}G\
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if((l-i)>THRESHOLD){ }m93AL_y
stack[++top]=i; w~ O)DhC
stack[++top]=l-1; *hlinQKs
} [13NhF3.P
if((j-l)>THRESHOLD){ Q`!<2i;
stack[++top]=l+1; zb. ^p
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stack[++top]=j; 1
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} %@^9(xTE
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} _#y=T20'3
//new InsertSort().sort(data); <,</ Ge
insertSort(data); ]zh6[0V7V
} Yv"-_
/** d~;U-
* @param data 1EQLsg`d^
*/ ZsN3 MbY
private void insertSort(int[] data) { M5c
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int temp; d;v<rw
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); .(Tf$V
} $D;-;5[-/r
} :wz]d ~)
} QRHM#v S
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} HY,VJxR[
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