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快速排序: lN#j%0MaUo
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package org.rut.util.algorithm.support; A$=ny6
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import org.rut.util.algorithm.SortUtil; TKR#YJQ?K
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/** ]~aj
* @author treeroot taE
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* @since 2006-2-2 Jh3
* @version 1.0 ?>}p'{I
*/
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public class QuickSort implements SortUtil.Sort{ Vr
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/* (non-Javadoc) v>]g="5}8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1'qXT{f/~
*/ rGP;0KtQ
public void sort(int[] data) { .; F<X\_
quickSort(data,0,data.length-1); iT}>a30]B
} 7|5kak>=
private void quickSort(int[] data,int i,int j){ A0<g8pv
int pivotIndex=(i+j)/2; zMv`<m%
//swap Rn~'S2`u
SortUtil.swap(data,pivotIndex,j); ^2~ZOP$A
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int k=partition(data,i-1,j,data[j]); \J+a7N8m,
SortUtil.swap(data,k,j); )#m{"rk[x,
if((k-i)>1) quickSort(data,i,k-1); F9
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if((j-k)>1) quickSort(data,k+1,j); kG/1
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} M{J>yN
/** HPt3WBRzS;
* @param data ^*}D*=>\
* @param i $VmV>NZ
* @param j Qn$'bK2V
* @return sE?%;uBb
*/ M2Nh3ijr
private int partition(int[] data, int l, int r,int pivot) { uVqc:Q"
do{ zDdo RK@
while(data[++l] while((r!=0)&&data[--r]>pivot); 9
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SortUtil.swap(data,l,r); p%$r\G-x
} mW"e
while(l SortUtil.swap(data,l,r); `,V&@}&"n
return l; QZVyU8j3
} \^(#b,k#
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} >)WE3PT/O"
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改进后的快速排序: >&.N_,*
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package org.rut.util.algorithm.support; X?haHM#]
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import org.rut.util.algorithm.SortUtil; zu}uW,XH-
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/** GG#-x$jK
* @author treeroot t%mi#Gh(
* @since 2006-2-2 Kh3i.gm7g
* @version 1.0 =_OJ
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*/ C/!P&`<6
public class ImprovedQuickSort implements SortUtil.Sort { (hwzA
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private static int MAX_STACK_SIZE=4096; l3u [
private static int THRESHOLD=10; q}_8iDO6
/* (non-Javadoc) glch06
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W
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*/ 'cCM[P+
public void sort(int[] data) { {%wrx'<
int[] stack=new int[MAX_STACK_SIZE]; -d?<t}a
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int top=-1; [p4([ef
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int pivot; "'DPb%o
int pivotIndex,l,r; 6<z#*`U1
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stack[++top]=0; M7qg\1L
stack[++top]=data.length-1; qi@Nz=t#HJ
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while(top>0){ {U9{*e$=
int j=stack[top--]; T pCXe\W
int i=stack[top--]; #F/W_G7 v
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pivotIndex=(i+j)/2; ^Cp;#|g,
pivot=data[pivotIndex]; aAcQmq TT
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SortUtil.swap(data,pivotIndex,j); cm!vuoB~~
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//partition >uJu!+#
l=i-1; e<DcuF<ZS
r=j; b 2\J<Nw
do{ .mnkV -m
while(data[++l] while((r!=0)&&(data[--r]>pivot)); W^W.* ?e`
SortUtil.swap(data,l,r); Y xnZ0MY
} ?5G;=#I
while(l SortUtil.swap(data,l,r); )"Ujx`]4r
SortUtil.swap(data,l,j); 87pu\(,'
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if((l-i)>THRESHOLD){ {#=o4~u%;H
stack[++top]=i; akj#.aYk
stack[++top]=l-1; "Z';nmv'N
} Ct(^nn$A
if((j-l)>THRESHOLD){ Ut%{pc 7^F
stack[++top]=l+1; ZXj*Vu$_4
stack[++top]=j; 6R2F,b(_
} sCf)#6mI
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} 75h]#k9\
//new InsertSort().sort(data); N+]HJ`K
insertSort(data); t@2MEo
} uxX 3wY;M
/** \^cXmyQ <%
* @param data |]HA@7B
*/ -lfbn=3
private void insertSort(int[] data) { tI0D{Xrc
int temp; ~1Ffu x
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); (nkiuCO
} H ~<.2b
} l>oJ^J
} 'v(b^x<ZS
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} dM -<aq
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