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快速排序: c2npma]DZ
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package org.rut.util.algorithm.support; ;m(iKwDt
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import org.rut.util.algorithm.SortUtil; E#k{<LYI
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/** OR<+y~Rv
* @author treeroot (@1:1K(
* @since 2006-2-2 6CY&pbR
* @version 1.0 %=aKW[uq]
*/ XIW0Z C
public class QuickSort implements SortUtil.Sort{ {D+mr[ %
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/* (non-Javadoc) jm^.E\_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |YJ83nSO~
*/ ]O@$}B];)
public void sort(int[] data) { qLN\%}69/
quickSort(data,0,data.length-1); A]z*#+Sl
} &|hK79D
private void quickSort(int[] data,int i,int j){ I%[e6qX@
int pivotIndex=(i+j)/2; "`vRHeCKN
//swap !/zRw-q3B
SortUtil.swap(data,pivotIndex,j); cl4E6\?z
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int k=partition(data,i-1,j,data[j]); fj_23{,/"g
SortUtil.swap(data,k,j); {7NGfzwp;6
if((k-i)>1) quickSort(data,i,k-1); wcGK*sWG-
if((j-k)>1) quickSort(data,k+1,j); S#/%#k103
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} }47h0 i
/** ++0)KSvw
* @param data %M(RV_R+6
* @param i c3vb~l)
* @param j "s+4!, k
* @return r"7n2
*/ 4DA34m(
private int partition(int[] data, int l, int r,int pivot) { ~^mUu`@r
do{ [{x}# oRSE
while(data[++l] while((r!=0)&&data[--r]>pivot); xnP!P2
SortUtil.swap(data,l,r); ^jdU4
} t^rw@$"}
while(l SortUtil.swap(data,l,r); )Z}AhX
return l; %By Pwu:f
} ~4~`bT9
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} Jup)m/
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改进后的快速排序: TktH28tK
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package org.rut.util.algorithm.support; kBu{ bxL
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import org.rut.util.algorithm.SortUtil; /R)wM#&
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/** hx;f/EPx
* @author treeroot OrY[
* @since 2006-2-2 ^Co-!jM
* @version 1.0 Zi!Ta"}8
*/ r* *zjv>
public class ImprovedQuickSort implements SortUtil.Sort { M^FY6TT4O
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private static int MAX_STACK_SIZE=4096; zzqJeIS
private static int THRESHOLD=10; Uzu6>yT
/* (non-Javadoc) [M?2axOC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) HgI!q<)
*/ x]~TGzS
public void sort(int[] data) { w0pMH p'Y
int[] stack=new int[MAX_STACK_SIZE]; m>>.N?
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int top=-1; UX 1
)((
int pivot; JfY*#({y
int pivotIndex,l,r; ZCiCZ)oc
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stack[++top]=0; o2 14V \
stack[++top]=data.length-1; wX$:NOO
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while(top>0){ xO~ElzGm
int j=stack[top--]; jlEz]@
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int i=stack[top--]; ()3\(d5e
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pivotIndex=(i+j)/2; A'WR!*Yt
pivot=data[pivotIndex]; .g*j]!_]
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SortUtil.swap(data,pivotIndex,j); >DqF>w.1
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//partition [6/QUD8
l=i-1; \mqx '
r=j; c8RJOc4X
do{ }aCa2%
while(data[++l] while((r!=0)&&(data[--r]>pivot)); #YUaM<O
SortUtil.swap(data,l,r); 1<@SMcj>
} mkl{Tp*
while(l SortUtil.swap(data,l,r); ,$P,x
SortUtil.swap(data,l,j); FR&`R
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if((l-i)>THRESHOLD){ VFHd2Ea(
stack[++top]=i; LF<&gC
stack[++top]=l-1; JzHG5nmB
} NW3c_]`=
if((j-l)>THRESHOLD){ 4zug9kFK
stack[++top]=l+1; hlTbCl
stack[++top]=j; 2z.ot'
} bS.w<V
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} )G? qX.D
//new InsertSort().sort(data); ^)VwxH:s
insertSort(data);
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} '`];=QY9pg
/** H=r-f@EOrI
* @param data t>"%exdoZ
*/ sE1cvAw9l
private void insertSort(int[] data) { 4ls:BO;k]
int temp; *6uccx7{
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ?GhyVXS y.
} 8~sP{V%
} )8Va%{j
} 9
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} xo:kT )
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