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快速排序: bP Er+?fu
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package org.rut.util.algorithm.support; /[GOs*{zB
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import org.rut.util.algorithm.SortUtil; z>&Py(
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/** V_~}7~
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* @author treeroot '9*wr*
* @since 2006-2-2 W2yNEiH
* @version 1.0 bUAjt>+
*/ LlRvm/
public class QuickSort implements SortUtil.Sort{ jY:(Tv3~
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/* (non-Javadoc) {j,bV6X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2ADUJ
*/ bI@+Or
public void sort(int[] data) { W]_+3qvZ
quickSort(data,0,data.length-1); PFG):i-?
} Z,,Da|edH
private void quickSort(int[] data,int i,int j){ BYVp~!u
int pivotIndex=(i+j)/2; }%y_LcL
//swap xh@H@Q\
SortUtil.swap(data,pivotIndex,j); ?9v!UT
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int k=partition(data,i-1,j,data[j]); h^~eTi;c]Q
SortUtil.swap(data,k,j); ~0|~Fg
if((k-i)>1) quickSort(data,i,k-1); k^]+I%?Q
if((j-k)>1) quickSort(data,k+1,j); Fmt5"3B
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} @p|[7'
/** l8GziM{lp
* @param data ^P:9iu)+]~
* @param i `\q4z-<-
* @param j j"_V+)SD
* @return Rr4r[g#
*/ vV#Jl)
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private int partition(int[] data, int l, int r,int pivot) { +tdt>)a
do{ (~}yt .7K
while(data[++l] while((r!=0)&&data[--r]>pivot); 20zIO.&o
SortUtil.swap(data,l,r); B HoZ}1_
} "KW\:uc /
while(l SortUtil.swap(data,l,r); QCa$<~c
return l; >efYpd#^
} g*-
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} mmTc.xh
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改进后的快速排序: TxN#3m?G
A:p7\Kp;5}
package org.rut.util.algorithm.support; ;TMH.E,h:
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import org.rut.util.algorithm.SortUtil; `8xe2=Ub
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/** eAu3,qoM
* @author treeroot rNfua
* @since 2006-2-2 0}PW?t76
* @version 1.0 =o{zw+|% %
*/ ',kYZay
public class ImprovedQuickSort implements SortUtil.Sort { Xn$]DE/r}N
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private static int MAX_STACK_SIZE=4096; 9j:?s;B
private static int THRESHOLD=10; He)v:AH
/* (non-Javadoc) B:qZh$YN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) b,KQG|k
*/ T9RR.
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public void sort(int[] data) { /ta-jOcRH&
int[] stack=new int[MAX_STACK_SIZE];
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int top=-1; K$#(\-M
int pivot; -g;iMqh#
int pivotIndex,l,r; RQ9fA1YP
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stack[++top]=0; %Ni)^
stack[++top]=data.length-1; i?qS8h{
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while(top>0){ Gow_a'
int j=stack[top--]; *vCJTz
int i=stack[top--]; E:&=A 4%
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pivotIndex=(i+j)/2; iW-w?!>|m
pivot=data[pivotIndex]; 2[r#y1ro
}4#%0x`w
SortUtil.swap(data,pivotIndex,j); 1W$ @ V!
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//partition MHI0>QsI
l=i-1; mAk)9`f/
r=j; >e=tem~/
do{ 6Nj\N oS
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 6n
SortUtil.swap(data,l,r); UXDd8OJL
} (t>BO`,
while(l SortUtil.swap(data,l,r); FGzB7w#
SortUtil.swap(data,l,j); $MfHA~^
ojT TYR{
if((l-i)>THRESHOLD){ ~U~KUL|
stack[++top]=i; _?Rprmjx}
stack[++top]=l-1; Y71io^td~j
} *]W{83rXQ
if((j-l)>THRESHOLD){ w/~,mzM"
stack[++top]=l+1; => )l6**UE
stack[++top]=j; \n6#D7OV
} 9p+DAs{i
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} D;.-e
//new InsertSort().sort(data); jXSo{
insertSort(data); &}OaiTzEmc
} )f*&}SV
/** $*H_0w Qc
* @param data pLDseEr<
*/ ht!o_0{~
private void insertSort(int[] data) { a+uSCs[C
int temp; ",w@_}z:
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ^UEI`_HO0
} t}c ymX~
} P"XF|*^U
} QuT8(s1Q!
% E3
} (Z,v)TOXjV
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