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快速排序: r:cUAe7#
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package org.rut.util.algorithm.support; Qi61(lK
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import org.rut.util.algorithm.SortUtil; &M!:,B
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/** Xy{+=UY
* @author treeroot #o RUH8
* @since 2006-2-2 Sf8d|R@O
* @version 1.0 E(8g(?4
*/ vn<S"
public class QuickSort implements SortUtil.Sort{ cjXwOk1:s
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/* (non-Javadoc) UQ)}i7v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hA8 zXk/'8
*/ Z:_y,( 1Q
public void sort(int[] data) { ?zEF?LJoK
quickSort(data,0,data.length-1); (AYD@
} 4=Ey\Px
private void quickSort(int[] data,int i,int j){ 1|VJN D
int pivotIndex=(i+j)/2; NP8TF*5V
//swap `{Jb{L@f
SortUtil.swap(data,pivotIndex,j); 0FOf *Lz
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int k=partition(data,i-1,j,data[j]); )YFs
SortUtil.swap(data,k,j); 1%,Z&@^j
if((k-i)>1) quickSort(data,i,k-1); "ivqh{ ,
if((j-k)>1) quickSort(data,k+1,j); v,&2!Zv
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} 3_$eQ`AAA
/** Ub,unU
* @param data U\ued=H
* @param i F
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* @param j R=PzR;8
* @return ^ne8~
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*/ 7,TWCVap
private int partition(int[] data, int l, int r,int pivot) { ~|rkt`8p
do{ 5WT\0]RUa
while(data[++l] while((r!=0)&&data[--r]>pivot); ' T]oV~H
SortUtil.swap(data,l,r); `?x$J
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} dK: "
while(l SortUtil.swap(data,l,r); e`r;`a&
return l; {P&^Erx
} J~q+G
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改进后的快速排序: d]EvC>
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package org.rut.util.algorithm.support; h86={@Le
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import org.rut.util.algorithm.SortUtil; aB^G
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/** W#j,{&KVn
* @author treeroot @3YuV=QfH
* @since 2006-2-2 U[l%oLra
* @version 1.0 ItADO'M
*/ / JB4 #i7
public class ImprovedQuickSort implements SortUtil.Sort { &J$5+"/;X
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private static int MAX_STACK_SIZE=4096; K*$#D1hG
private static int THRESHOLD=10; <q\)
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/* (non-Javadoc) $0T"YC%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4- _lf(#i
*/ P-[K*/bPw
public void sort(int[] data) { sv"mba.J
int[] stack=new int[MAX_STACK_SIZE]; M%xL K7
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int top=-1; AF]!wUKxy
int pivot; S:/RYT"
int pivotIndex,l,r; Ky#B'Bh}`g
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stack[++top]=0; on?/tHys
stack[++top]=data.length-1; 9
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while(top>0){ A@(h!Cq
int j=stack[top--]; T+R I8.#o
int i=stack[top--];
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pivotIndex=(i+j)/2; F|TMpH/
pivot=data[pivotIndex]; "R@N|Qx'
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SortUtil.swap(data,pivotIndex,j); dM{~Ubb
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//partition x9l0UD*+g
l=i-1; mo[<4Uks
r=j; 2F@)nh
do{ +wozjjc
while(data[++l] while((r!=0)&&(data[--r]>pivot)); x}'4^Cv
SortUtil.swap(data,l,r); :xS&Y\ry
} ii
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while(l SortUtil.swap(data,l,r); '<< ~wt
SortUtil.swap(data,l,j); dqA[|bV
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if((l-i)>THRESHOLD){ ++DQS9b{
stack[++top]=i; f~nt!$
stack[++top]=l-1; zK4
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} cuaNAJ
if((j-l)>THRESHOLD){ ,Bw)n,
stack[++top]=l+1; W#I:j: p
stack[++top]=j; S?\hbM]V-o
} wZ8 MhE
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} "%''k~UD4
//new InsertSort().sort(data); dyiEK)$h
insertSort(data); "C.7;Rvkp>
} ywynx<Wg
/** Wk#h,p3
* @param data 34wM%@D*c
*/ t-*|Hfp*^
private void insertSort(int[] data) { ?4[Oh/]R
int temp; SiqX1P
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); }BdVD t
} dIpW!Pj^
} %m{.l4/!O
} 1"&;1Ts
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