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快速排序: 7-hSso.'
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package org.rut.util.algorithm.support; -h<Rby
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import org.rut.util.algorithm.SortUtil; wx|eO[14
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/**
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* @author treeroot L0HkmaH
* @since 2006-2-2 N\OeWjA F
* @version 1.0 &\, ZtaB
*/ }+8w
public class QuickSort implements SortUtil.Sort{ OJ:iQ
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/* (non-Javadoc) Pe_iA_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A<zSh}eh6
*/ jI(}CT`g
public void sort(int[] data) { JtrLTo
quickSort(data,0,data.length-1); ."m2/Ks7
} "`AIU}[_I
private void quickSort(int[] data,int i,int j){ UlN+
int pivotIndex=(i+j)/2; D20n'>ddg
//swap 71?>~PnbH}
SortUtil.swap(data,pivotIndex,j); L-lDvc?5c
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int k=partition(data,i-1,j,data[j]); ;-1yG@KG
SortUtil.swap(data,k,j); ,nELWzz%{
if((k-i)>1) quickSort(data,i,k-1); nRmZu\(Ow|
if((j-k)>1) quickSort(data,k+1,j); Dog Tj
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} x\m !3
/** M#Vl{ b
* @param data 9_mys}+
* @param i "=uphBZog
* @param j \y9( b
* @return @,RrAL}|
*/ ?6gC;B
private int partition(int[] data, int l, int r,int pivot) { N!}r(Dd*
do{ 9?M><bBX
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); 4epE!`z_&
} i(XcNnn6
while(l SortUtil.swap(data,l,r); *LbRLwt
return l; 5X5 &(S\
} 8uR4ZE*
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} bt/u^E
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改进后的快速排序: `)[bu
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package org.rut.util.algorithm.support; !dVth)UV
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import org.rut.util.algorithm.SortUtil; !`yg bI.
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/** :6 ?&L
* @author treeroot u~,@Zg87
* @since 2006-2-2 fCL5Et
* @version 1.0 x>^r%<WbX
*/ *OT6)]|k
public class ImprovedQuickSort implements SortUtil.Sort { YH(
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private static int MAX_STACK_SIZE=4096; j"aimjqd3
private static int THRESHOLD=10; ei>8{v&g
/* (non-Javadoc) h5-<2B|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G(-1"7
*/ *5bKJgwJ
public void sort(int[] data) { c[4H
int[] stack=new int[MAX_STACK_SIZE]; 777N0,o(
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int top=-1; iD)R*vnAi
int pivot; U[1Ir92:
int pivotIndex,l,r; oW*e6"<R7
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stack[++top]=0; xA DjQ%B
stack[++top]=data.length-1; .R/`Y)4
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while(top>0){ URq{#,~CT
int j=stack[top--]; HY.??
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int i=stack[top--]; `b^eRnpR
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pivotIndex=(i+j)/2; 72qbxPY13h
pivot=data[pivotIndex]; D=U"L-rRs
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SortUtil.swap(data,pivotIndex,j); yp=(wcJ
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//partition )vB,eZq
l=i-1; }|
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r=j; ,4hQ#x
do{ ^[{\ZX
while(data[++l] while((r!=0)&&(data[--r]>pivot)); rAK}rNxI
SortUtil.swap(data,l,r); L`%v#R
} 9 |Cu2
while(l SortUtil.swap(data,l,r); Zs
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SortUtil.swap(data,l,j); I^pD=1Y]
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if((l-i)>THRESHOLD){ IG?044Y
stack[++top]=i; `Z*k M VN
stack[++top]=l-1;
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} SrPZ^NF
if((j-l)>THRESHOLD){ -MrEJ
stack[++top]=l+1; N`7) 88>w
stack[++top]=j; FpjpsD~Qu
} Aen)r@Y:
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} )x1LOMe
//new InsertSort().sort(data); A ^YHtJ
insertSort(data); i?uJ<BdU[
} %UuV^C
/** d Ybb>rlu
* @param data n22k<@y
*/ c0v;r4Jo#j
private void insertSort(int[] data) { Jrp{e("9
int temp; F0O"rN{
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 2)DrZI
} q| p6UL9
} sM)n-Yy#9
} 6$TE-l
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} jX5lwP
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