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快速排序: {4HcecT
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package org.rut.util.algorithm.support; E6s)J -a
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import org.rut.util.algorithm.SortUtil; tZ_D.syBAc
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/** h7o?z!
* @author treeroot .%x%(olf
* @since 2006-2-2 V-w{~
* @version 1.0 8\$u/(DX
*/ oO&R3zA1d
public class QuickSort implements SortUtil.Sort{ *QP+p,L*
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/* (non-Javadoc) xA]}/*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O
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*/ |,WP)
public void sort(int[] data) { ,*d<hBGbh
quickSort(data,0,data.length-1); n>?eTlO3
} j5bp)U
private void quickSort(int[] data,int i,int j){ R9)"%SO<y
int pivotIndex=(i+j)/2; \'-E[xNcWI
//swap 9?4:},FRmE
SortUtil.swap(data,pivotIndex,j); +VRM:&
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int k=partition(data,i-1,j,data[j]); 2HF_kYZ
SortUtil.swap(data,k,j); o$KW*aDp
if((k-i)>1) quickSort(data,i,k-1); fW3NH7aUG
if((j-k)>1) quickSort(data,k+1,j); >A ?,[p`<
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} % O\zYtQR
/** KU*XRZu)
* @param data 9;`E,w
* @param i <@J0
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* @param j ECr}7R%
* @return xpB*>zb
*/ HAdDr!/`
private int partition(int[] data, int l, int r,int pivot) { YzeNr*
do{ ID8u&:
while(data[++l] while((r!=0)&&data[--r]>pivot); i{4J$KT
SortUtil.swap(data,l,r); tDn:B$*}W,
} 1Y(NxC0P=g
while(l SortUtil.swap(data,l,r);
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return l; ,<!v!~Iy
} JNxrs~}
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改进后的快速排序: 5 =Op%
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package org.rut.util.algorithm.support; ['Y"6[1
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import org.rut.util.algorithm.SortUtil; '))K'
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/** W*^_Ul|
* @author treeroot (e_ l1O?
* @since 2006-2-2 ^!*nhs%
* @version 1.0 kB-]SD#
*/ .0?A0D?sP
public class ImprovedQuickSort implements SortUtil.Sort { {B7${AE
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private static int MAX_STACK_SIZE=4096; ~+CEek
private static int THRESHOLD=10; fRomP-S
/* (non-Javadoc) YWF Hv@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,C}s8|@k
*/ i 2l/y,UX
public void sort(int[] data) { <
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int[] stack=new int[MAX_STACK_SIZE]; ;2[o>73F
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int top=-1; HJjx!7h
int pivot; =;~*YD(%/
int pivotIndex,l,r; #R*7y%cO
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stack[++top]=0; =+w!fy
stack[++top]=data.length-1; (Q}ByX
}j;G`mV2
while(top>0){ aI_[h
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int j=stack[top--]; "2z&9`VIY
int i=stack[top--]; x,LYfy"0
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pivotIndex=(i+j)/2; n.OsmCR N;
pivot=data[pivotIndex]; 9NeHN@D)
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SortUtil.swap(data,pivotIndex,j); bkFO4OZd
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//partition iaHL&)[YK
l=i-1; ] ]XXcQ,A
r=j; W:JR\KKU
do{ o'K= X E
while(data[++l] while((r!=0)&&(data[--r]>pivot)); xiOAj"}~
SortUtil.swap(data,l,r); sQBKzvFO3
} Q PrP3DK
while(l SortUtil.swap(data,l,r); I+W:}}"j
SortUtil.swap(data,l,j); ^X ~S}MX
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if((l-i)>THRESHOLD){ 2B b,ZC*
stack[++top]=i; 1xjWD30
stack[++top]=l-1;
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} ~Z' /b|x<3
if((j-l)>THRESHOLD){ PwU<RKAE
stack[++top]=l+1; X8y :=k,E
stack[++top]=j; m{f+!
}
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} ?D;7ut$~
//new InsertSort().sort(data); I(>j"H)cAF
insertSort(data); %#TAz7
} fLZ mQO
/** u4h.\ul8%
* @param data 7ygz52
*/ ^~^=$fz
private void insertSort(int[] data) { sGG
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int temp; Cs2kbG_
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); KzQuLD(e
} rlY n"3%
} jEn9T
} TeKU/&fkc
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} 9Y+7o%6e
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