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快速排序: ~Fp,nE-B
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package org.rut.util.algorithm.support; HTiqErD2_
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import org.rut.util.algorithm.SortUtil; ~&B{"d
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/** HEH Tj,T
* @author treeroot IH8^ fyQ`
* @since 2006-2-2 Qfx(+=|
* @version 1.0 ,DsqKXSU
*/ rKEi1b
public class QuickSort implements SortUtil.Sort{ +>mbBu!7
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/* (non-Javadoc) ]Tk3@jw+b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #ky]@vyO
*/ l6Wa~ E
public void sort(int[] data) { LN}eD\
quickSort(data,0,data.length-1); Nr)v!z~y
} ][3H6T!ckL
private void quickSort(int[] data,int i,int j){ pwAawm
int pivotIndex=(i+j)/2; SQx%CcW9d
//swap bE:oF9J?
SortUtil.swap(data,pivotIndex,j); O* `v1>
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int k=partition(data,i-1,j,data[j]); =c>2d.^l
SortUtil.swap(data,k,j); 6p`AdDV
if((k-i)>1) quickSort(data,i,k-1); [mX/]31
if((j-k)>1) quickSort(data,k+1,j); }9yAYZ0q{b
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} Lt>"R! "x
/** d\&{Ev9v
* @param data o}H7;v8H
* @param i )jkX&7x
* @param j ?,~B@Kx
* @return J%`-K"NB
*/ u:#+R_0#97
private int partition(int[] data, int l, int r,int pivot) { \|9@*]6:
do{ pJ35M
while(data[++l] while((r!=0)&&data[--r]>pivot); P(pw$
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SortUtil.swap(data,l,r); h{xC0NC)
} vW,dJ[N6jm
while(l SortUtil.swap(data,l,r); wz^Q,Od
return l; Ojqbj0E9
} *y
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} L&V;Xvbu%
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改进后的快速排序: dl_ h0
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package org.rut.util.algorithm.support; OI0#@_L&
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import org.rut.util.algorithm.SortUtil; IsjxD|u
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/** \HX'^t`
* @author treeroot W"
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* @since 2006-2-2 ^Xv_y+
* @version 1.0 wBz?OnD/D
*/ +-tvNX%IJ
public class ImprovedQuickSort implements SortUtil.Sort { .^6;_s>FN
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private static int MAX_STACK_SIZE=4096; !$&k@#v:
private static int THRESHOLD=10; K=,nX7Z5
/* (non-Javadoc) 'z$ BgXh\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u[nx?!
*/ xCU^4DO3p
public void sort(int[] data) { q =sEtH=
int[] stack=new int[MAX_STACK_SIZE]; Qvc "?yx8}
K;,zE6WD$$
int top=-1; wh4ik`S 1
int pivot; ;UuCSfs{
int pivotIndex,l,r; 7<{g+Q~7*
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stack[++top]=0; ^Ud1 ag!-
stack[++top]=data.length-1; \a\-hm
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while(top>0){ "f^s*I
int j=stack[top--]; 2d:<P!B
int i=stack[top--]; B-Bgk
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pivotIndex=(i+j)/2; \Tq !(]o^
pivot=data[pivotIndex]; B#RBR<MFC
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SortUtil.swap(data,pivotIndex,j); hx|Cam"
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//partition %04N"^mT'~
l=i-1; :`('lrq
r=j; MmUtBT
do{ eeKErpj8A
while(data[++l] while((r!=0)&&(data[--r]>pivot)); zN}1Qh
SortUtil.swap(data,l,r); A+3, y<j\
} 7&oT}Z
while(l SortUtil.swap(data,l,r); j{k]8sI,H]
SortUtil.swap(data,l,j); (
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if((l-i)>THRESHOLD){ 6)<g%bH!
stack[++top]=i; -L%J,f[&,
stack[++top]=l-1; /.PjHTM<
} Gk~QgD/Pix
if((j-l)>THRESHOLD){ p4l^b[p
stack[++top]=l+1; %eJolztKZ
stack[++top]=j; "^sh:{
} }dnO7K
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} kU uDA><1
//new InsertSort().sort(data); +/!kL0[v
insertSort(data); +; /]'
} @tv3\eD
/** poJ7q (
* @param data VVY#g%(K
*/ n-X;JYQW
private void insertSort(int[] data) { [C1.*Q+l
int temp; 'Xj9sAB
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); &f12Q&jY7
} w-f[h
} M0Eq
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} -M]NdgI
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} s?qRy
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