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快速排序: 5uuZ t0V\
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package org.rut.util.algorithm.support; |>(;gr/5(
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import org.rut.util.algorithm.SortUtil; YT6<1-E#
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/** N*N@wJy:5
* @author treeroot +^
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* @since 2006-2-2 ~*9
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* @version 1.0 18 pi3i[
*/ {1.t ZCMT
public class QuickSort implements SortUtil.Sort{ Re**)3#gn
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/* (non-Javadoc) f:gXXigY,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0!YB.=\{_q
*/ |T~C($9
public void sort(int[] data) { +(*S@V$c
quickSort(data,0,data.length-1); 1CFTQB >
} .olDmFQD
private void quickSort(int[] data,int i,int j){ qh!2dj
int pivotIndex=(i+j)/2; u;m[,
//swap gwtR<2,p
SortUtil.swap(data,pivotIndex,j); h[M~cZ{
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int k=partition(data,i-1,j,data[j]); RfVVAaI
SortUtil.swap(data,k,j); vq|o}6Et
if((k-i)>1) quickSort(data,i,k-1); S+G!o]&2
if((j-k)>1) quickSort(data,k+1,j); Ai&-W
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} \*Roa&<!
/** LwQq0<v
* @param data fX=o,=-f
* @param i 5T)qn`%
* @param j E^aHe
* @return kYBy\
*/ hce *G@b
private int partition(int[] data, int l, int r,int pivot) { _zq"<Q c
do{ &L[7jA'[J
while(data[++l] while((r!=0)&&data[--r]>pivot); #gzY _)E
SortUtil.swap(data,l,r); C
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} =c
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while(l SortUtil.swap(data,l,r); Fp52|w_
return l; !iBe/yb
} ]]~tFdh
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} AsyJDt'i
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改进后的快速排序: 42X N*br
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package org.rut.util.algorithm.support; vovc,4}
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import org.rut.util.algorithm.SortUtil; S&]AIG)
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/** tW4|\-E"s4
* @author treeroot n\8;4]n
* @since 2006-2-2 % c[Q_
* @version 1.0 <BoDLvW>
*/ K?[*9Q'\
public class ImprovedQuickSort implements SortUtil.Sort { oG5:]/F
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private static int MAX_STACK_SIZE=4096; X=O}k&
private static int THRESHOLD=10; P70\ |M0~y
/* (non-Javadoc) gd~# uR\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;Ml??B]C
*/ > <cK
public void sort(int[] data) { !vNZ-}
int[] stack=new int[MAX_STACK_SIZE]; wfr+-
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int top=-1; 2n}nRv/'
int pivot; t Dx!m~[
int pivotIndex,l,r; n{oRmw-
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stack[++top]=0; *LnY}#
stack[++top]=data.length-1; Hd)z[6u8eT
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while(top>0){ hZ_0lX}
int j=stack[top--]; x!$Dje}
int i=stack[top--]; ZZ 1s}TG
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pivotIndex=(i+j)/2; Gt{'` P,&9
pivot=data[pivotIndex]; mQ#E{{:H+
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SortUtil.swap(data,pivotIndex,j); Wl3jbupu _
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//partition =*f>vrme
l=i-1; YDEUiZ~
r=j; yxfV|ox
do{ ~_vzss3-C
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 0:K4,
SortUtil.swap(data,l,r); eM)E3~K:2
} ['F,
while(l SortUtil.swap(data,l,r); "52nT
SortUtil.swap(data,l,j); 4fe$0mye
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if((l-i)>THRESHOLD){ |E+tQQr%'
stack[++top]=i; 1iOQ8hD
stack[++top]=l-1; "zJGYBen
} {4\hxyw
if((j-l)>THRESHOLD){ QInow2/u
stack[++top]=l+1; {,r7dxI)`
stack[++top]=j; B Z:H$v
} i*16kdI.
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} |JVeW[C
//new InsertSort().sort(data); Y~=]RCg
insertSort(data); U'iL|JRF
} .hh2II
/** 7h?yAgDv~
* @param data 3HsjF5?W
*/ =m@5$
private void insertSort(int[] data) { 5[WhjTo
int temp; 8.ek_r
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); A:"J&TbBx
} YM9oVF-
} %9|=\#
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} -la~p~8
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