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快速排序: f&^"[S"\f
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package org.rut.util.algorithm.support; M \k[?i
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import org.rut.util.algorithm.SortUtil; G;vj3#u?
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/** 65O 8?I
* @author treeroot fUY05OMZ
* @since 2006-2-2 /%,aX[
* @version 1.0 r0[<[jEh
*/ c;"e&tW
public class QuickSort implements SortUtil.Sort{ KFO
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/* (non-Javadoc) W<#!H e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <XDnAv0t
*/ :NWIUN
public void sort(int[] data) { /*BU5
quickSort(data,0,data.length-1); GT]>
} oxeu%wj_
private void quickSort(int[] data,int i,int j){ AhA&=l
i;
int pivotIndex=(i+j)/2; +HUy,@^Pa
//swap B/@LE{qUn
SortUtil.swap(data,pivotIndex,j); XgnNYy6W
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int k=partition(data,i-1,j,data[j]); 3w |5%`
SortUtil.swap(data,k,j); )7+z/y+[n
if((k-i)>1) quickSort(data,i,k-1); hO3
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if((j-k)>1) quickSort(data,k+1,j); $)KODI>|
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} -R]~kGa6m<
/** PIo@B|W-SX
* @param data =8*ru\L:hr
* @param i m='}t \=
* @param j ']\SX*z?
* @return 0',buJncV
*/ "?aI
private int partition(int[] data, int l, int r,int pivot) { ]ke9ipj]:
do{ /8l@ndZf
while(data[++l] while((r!=0)&&data[--r]>pivot); ST[TKL<]
SortUtil.swap(data,l,r); S!$S'{f<
} y5aPs z
while(l SortUtil.swap(data,l,r); pT~3<
,
return l; H}G 9gi
} :8/ 6dx@Y(
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} }vY^eOK.
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改进后的快速排序: z3L=K9)
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package org.rut.util.algorithm.support; y O@1#
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import org.rut.util.algorithm.SortUtil; 2NjgLXP
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/** rf]z5;
* @author treeroot SYsO>`/ )
* @since 2006-2-2 WH39=)D%u
* @version 1.0 i
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*/ E`qX|n
public class ImprovedQuickSort implements SortUtil.Sort { gSwHPm%zn
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private static int MAX_STACK_SIZE=4096; .nVY" C&
private static int THRESHOLD=10; c*zeO@AAn
/* (non-Javadoc) 4t%Lo2v!X%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I;wxgWOP
*/ k}nGgd6XD
public void sort(int[] data) { x_<#28H!
int[] stack=new int[MAX_STACK_SIZE]; `~VL&o1>
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int top=-1; .L%pWRxA[
int pivot; ,38M6yD
int pivotIndex,l,r; QbSLSMoL
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stack[++top]=0; "m6G;cv
stack[++top]=data.length-1; mDv<d =p!
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while(top>0){ c C) <Y#1
int j=stack[top--]; UeZ(@6_:
int i=stack[top--]; }dMX1e1h8
r
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pivotIndex=(i+j)/2; 90iveb21}
pivot=data[pivotIndex]; jxm#4
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SortUtil.swap(data,pivotIndex,j); HfH_jnR*
9SA %'
//partition %rrD+
l=i-1; %WR"qd&HSh
r=j; {%k[Z9*tO
do{ *5s*-^'#!
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Uea2WJpX
SortUtil.swap(data,l,r); 8;<aco/62
} q\jq9)
while(l SortUtil.swap(data,l,r); e2V;6N
SortUtil.swap(data,l,j); ft@#[Bkx
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if((l-i)>THRESHOLD){ .+?]"1>]
stack[++top]=i; _ Dz*%
stack[++top]=l-1; Ho(}_Q&
} I
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if((j-l)>THRESHOLD){ *>[q*SF
stack[++top]=l+1; bYem0hzOe
stack[++top]=j; o2$A2L9P
} 6?.S-.Mr
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} 0i8\Lu6
//new InsertSort().sort(data); #pW!(tfN^a
insertSort(data); ~~"U[G1
} 9+<A7PM1T
/** ABp8PD
* @param data p^w)@^f
*/ QALr
private void insertSort(int[] data) { @J6r;4|&
int temp; z.)*/HGJm
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); @QnKaZ8jW
} }LX!dDuwA
} 99'c\[fd'
} [K4k7$
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} ~^'t70 :D
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