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快速排序: 9v)p0
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package org.rut.util.algorithm.support; PT4Xr=z =
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import org.rut.util.algorithm.SortUtil; L%`~`3%n-
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/** H=]$9ZH!
* @author treeroot r,=xI`XH
* @since 2006-2-2 e#Jx|Ej=
* @version 1.0 #.p^S0\pw
*/ \7Hzj0hSi
public class QuickSort implements SortUtil.Sort{ ey<u
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/* (non-Javadoc) "!<Kmh5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6'W79
*/ ~rEU83
public void sort(int[] data) { xB:,l'\G
quickSort(data,0,data.length-1); log{jF
} .>>@q!!s!
private void quickSort(int[] data,int i,int j){
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int pivotIndex=(i+j)/2; yA*~O$~Y
//swap T/G1v;]
SortUtil.swap(data,pivotIndex,j); Mj |)KDL
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int k=partition(data,i-1,j,data[j]); 6}mbj=E`
SortUtil.swap(data,k,j); "|RP_v2
if((k-i)>1) quickSort(data,i,k-1); <4}zl'.
if((j-k)>1) quickSort(data,k+1,j); /b,M492
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} ghd~p@4
/** <lZyUd
* @param data AbUPJF"F
* @param i >FPE%X0+
* @param j |Q:$G!/
* @return qgrRH'
*/ I_.(&hMn
private int partition(int[] data, int l, int r,int pivot) { x{<WJ|'B
do{ $7gzu4f
while(data[++l] while((r!=0)&&data[--r]>pivot); I z~#G6]M
SortUtil.swap(data,l,r); a`(6hL3IT
} Woa5Ov!n0
while(l SortUtil.swap(data,l,r); gT-'#K2qT
return l; bs
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} 1C+Y|p?KA
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} |$Dt6{h
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改进后的快速排序: u7G@VZ Ux5
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package org.rut.util.algorithm.support; L?&+*|VxI
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import org.rut.util.algorithm.SortUtil; x3T)/'(
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/** >i~W$;t
* @author treeroot `,H\j?
* @since 2006-2-2 5%(J +d
* @version 1.0 NuI9"I/
*/ uSbOGhP
public class ImprovedQuickSort implements SortUtil.Sort { 9Am&G
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private static int MAX_STACK_SIZE=4096; >x@]wsj
private static int THRESHOLD=10; X!&DKE
/* (non-Javadoc) M_+&XLnzsJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !y$Hr[v
*/ {%.
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public void sort(int[] data) { <`5>;Xn=
int[] stack=new int[MAX_STACK_SIZE]; K"VphKvR
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int top=-1; EHkb{Q8
int pivot; nlXg8t^G
int pivotIndex,l,r; MBs]<(RJZ
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stack[++top]=0; \k0%7i[nZ/
stack[++top]=data.length-1; PXm{GLXRS;
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while(top>0){ 7}-.U=tnP
int j=stack[top--]; v 2k/tT$t
int i=stack[top--]; dsX{5
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pivotIndex=(i+j)/2; J}EQ_FC"$
pivot=data[pivotIndex]; {,.1KtrSN
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SortUtil.swap(data,pivotIndex,j); pSkP8'
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//partition
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l=i-1; '?t]iRCeI7
r=j; LW?] ~|
do{ "5Oog<
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 4ao
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SortUtil.swap(data,l,r); *CA|}l
} #9O
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while(l SortUtil.swap(data,l,r); u$[
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SortUtil.swap(data,l,j); GZ/.eYE
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if((l-i)>THRESHOLD){ cy*Td7)/
stack[++top]=i; >Mj :'
stack[++top]=l-1; |TF,Aj
} \D?6_
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if((j-l)>THRESHOLD){ vi@a87w>
stack[++top]=l+1; Ttn=VX{
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stack[++top]=j; yxQxc5/X)
} ,,mkB6;
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} l*uNi47|
//new InsertSort().sort(data); qd~)Ya1
insertSort(data); \.myLkm
} b')CGqbbmT
/** H)tYxW
* @param data <%hSBDG!x
*/ tf|/_Y2
private void insertSort(int[] data) { (FbqKx'uq
int temp; VF!?B>
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); RO'MFU<g
} jC
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} wfM$JYfI
} @!'Pr$`
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} 5!}xl9D
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