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快速排序: '#.:%4
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; /m;w~-N
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/** */L;6_
* @author treeroot NW9k.D%
* @since 2006-2-2 e-os0F
* @version 1.0 1*x4T%RF$
*/ H\3CvFm
public class QuickSort implements SortUtil.Sort{ m(3bO[u1
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/* (non-Javadoc) vN7ihe[C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {fMrx1
*/ o+O\VNW
public void sort(int[] data) { 8[FC
quickSort(data,0,data.length-1); *3<m<<>U
} FJ}QKDQW=
private void quickSort(int[] data,int i,int j){ ':!;6v|L
int pivotIndex=(i+j)/2; uu>[WFh
//swap f41!+W=
SortUtil.swap(data,pivotIndex,j); 00G[`a5
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int k=partition(data,i-1,j,data[j]); `4&\ %9
SortUtil.swap(data,k,j); <!zItFMD[m
if((k-i)>1) quickSort(data,i,k-1); 5hp b=2
if((j-k)>1) quickSort(data,k+1,j); j>s%q.
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} C_#0Y_O
/** _TB\@)\
* @param data m`9)DsR
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* @param i =I/J !}.
* @param j ZF;S}1
* @return 5Tpn`2F
*/ ]owH [wvX
private int partition(int[] data, int l, int r,int pivot) { K5.C*|w
do{ iuHG9 #n
while(data[++l] while((r!=0)&&data[--r]>pivot); ;%jt;Xv9
SortUtil.swap(data,l,r); /BIPLDN6
} If&p$pAH?
while(l SortUtil.swap(data,l,r); C3_*o>8
return l; M}5 C;E*
} gN]`$==c[
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} }dXL= ul
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改进后的快速排序: lpp'.HTP
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package org.rut.util.algorithm.support; -%N (X8
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import org.rut.util.algorithm.SortUtil; ]DUH_<3"E
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/** O.$<Bf9
* @author treeroot nu3 A'E`'k
* @since 2006-2-2 Z?x]HB`r
* @version 1.0 {[9^@k
*/ WWO jyj
public class ImprovedQuickSort implements SortUtil.Sort { q(r2\
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private static int MAX_STACK_SIZE=4096; *"4<&F
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private static int THRESHOLD=10; Rxli;blzi
/* (non-Javadoc) x9ws@=[:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0?:ZER v
*/ ]t=>#
public void sort(int[] data) { u3ZG;ykM
int[] stack=new int[MAX_STACK_SIZE]; xxiLi46/
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int top=-1; e!-'O0-Kw
int pivot; ~xJD3Qf
int pivotIndex,l,r; OS9v.pz
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stack[++top]=0; };+s0:H
stack[++top]=data.length-1; zyR pHM$E
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while(top>0){ 5Ci}w|c/>
int j=stack[top--]; zV&3l9?U
int i=stack[top--]; 9e=*jRs]l^
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pivotIndex=(i+j)/2; 7RLh#D|
pivot=data[pivotIndex]; ]S[r$<r$
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SortUtil.swap(data,pivotIndex,j); lxd<^R3i#^
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//partition E7<:>Uh
l=i-1; i!HGM=f
r=j; Lf-8G5G
do{ TXa XJIp
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 4|e#b(!
SortUtil.swap(data,l,r); Ov|j{}=L=9
} ]@P*&FRcZ
while(l SortUtil.swap(data,l,r); DEs?xl]zO
SortUtil.swap(data,l,j); /{U{smtdFl
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if((l-i)>THRESHOLD){ @$*c0.
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stack[++top]=i; a9I8WQ
stack[++top]=l-1; meL'toaJdQ
} "+WR[-n>\
if((j-l)>THRESHOLD){ /7#&qx8
stack[++top]=l+1; ^
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stack[++top]=j; 8tL61x{]
} L8G4K)
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} tWiV0PTI
//new InsertSort().sort(data); :1=?/8h
insertSort(data); CQ`(,F3(
} $>UzXhf}\
/** Jc)1}
* @param data XJ\q!{;h
*/ c`.:"i"k3
private void insertSort(int[] data) { r &[~/m8zl
int temp; EyeLC6u
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); HA%ye"(y8
} Esjv^* v9-
} W% [5~N
} O, {
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