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快速排序: #?%akQ+w
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package org.rut.util.algorithm.support; .w5#V|
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import org.rut.util.algorithm.SortUtil; o=i)s2
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/** )6mx\t
* @author treeroot 8tq6.%\
* @since 2006-2-2 f1GV6/| m
* @version 1.0 <L|eY(:
*/ s/ [15
public class QuickSort implements SortUtil.Sort{ 0tbximmDb
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/* (non-Javadoc) :&D>?{b0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |Y'xtOMX
*/ U 7mA~t2E
public void sort(int[] data) { m NkS!(L6
quickSort(data,0,data.length-1); L B`=+FD
} }G^Bc4@b
private void quickSort(int[] data,int i,int j){ 0CXh|AU
int pivotIndex=(i+j)/2; p\lS)9
//swap S%KY%hUt
SortUtil.swap(data,pivotIndex,j); *p!K9$4
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int k=partition(data,i-1,j,data[j]); hKq <e%oVH
SortUtil.swap(data,k,j); W\09hZ6
if((k-i)>1) quickSort(data,i,k-1); j" wX7
if((j-k)>1) quickSort(data,k+1,j); YrAaL"20
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} OiPE,sv
/** J
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* @param data jU')8m[
* @param i Dw}8ci'
* @param j :$Lu
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* @return _r!''@B
*/ o6f^DG3*
private int partition(int[] data, int l, int r,int pivot) { w)I!q&`Y
do{ Ao%E]M
while(data[++l] while((r!=0)&&data[--r]>pivot); <3\t J
SortUtil.swap(data,l,r); $47cKit|k:
} \(UEjlo
while(l SortUtil.swap(data,l,r); GCx1lm
return l; Jp)>Wd
} n]&/?6}
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} {XYv&K
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改进后的快速排序: s_Y1rD*B
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package org.rut.util.algorithm.support; :UjHP}s
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import org.rut.util.algorithm.SortUtil; S-^y;#=
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/** |RT#ZMJek
* @author treeroot
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* @since 2006-2-2 mo%9UL,#W
* @version 1.0 Zw(*q?9\
*/ s=`1wkh0
public class ImprovedQuickSort implements SortUtil.Sort { }9T$ XF~
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private static int MAX_STACK_SIZE=4096; ]p3hq1u3&
private static int THRESHOLD=10; U85t !U
/* (non-Javadoc) NJ8QI(^"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2^ 'X
*/ ;OW`(jC
public void sort(int[] data) { FG8genCH@
int[] stack=new int[MAX_STACK_SIZE]; 4xLU15C
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int top=-1; iN%\wkx*N
int pivot; #W<D~C[I _
int pivotIndex,l,r; ]>h2h ?2te
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stack[++top]=0; $^R[t;
stack[++top]=data.length-1; x9r5 ;5TI
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while(top>0){ kM>0>fkjE
int j=stack[top--]; I^ W
int i=stack[top--]; @DK,ka(
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pivotIndex=(i+j)/2; b{H&%Jx)
pivot=data[pivotIndex]; cWIX!tc8
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SortUtil.swap(data,pivotIndex,j); U+sAEN_e k
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//partition !Dp4uE:Pq
l=i-1; YIs (Q
r=j; Qg
do{ btb-MSkO
while(data[++l] while((r!=0)&&(data[--r]>pivot)); V.J[Uwf
SortUtil.swap(data,l,r); d#7 z
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} +:w9K!31-
while(l SortUtil.swap(data,l,r); i}Ea>bi{N
SortUtil.swap(data,l,j); %)_R>. >
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if((l-i)>THRESHOLD){ :,<e
stack[++top]=i; V/i&8UMw
stack[++top]=l-1; -)@DH;[tb
} 7SYU^GD
if((j-l)>THRESHOLD){ O6gI%Jdp
stack[++top]=l+1; N,|:=gD_
stack[++top]=j; @;x|+@r
} R:YX{Tq
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} CD1}.h
//new InsertSort().sort(data); Ty\&ARjb 8
insertSort(data); EOhUr=5~
} b8)>:F
/** }S'+Ytea
* @param data s9)
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*/ WQ4:='(
private void insertSort(int[] data) { 4A0R07"
int temp; e#L/
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 7dI+aJ
} Sj{z
} ;<0Q<0G
} bnLvJ]i)
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} sJtz{'
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