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快速排序: U$JIF/MO_
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package org.rut.util.algorithm.support; >\x
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import org.rut.util.algorithm.SortUtil; "^e?E:( 3
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/** M[N.H9
* @author treeroot t4c#' y
* @since 2006-2-2 imq(3?
* @version 1.0 =]mx"0i[
*/ =sVt8FWGY
public class QuickSort implements SortUtil.Sort{ Ck a]F2,
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/* (non-Javadoc) L;t~rW!1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [cAg'R6
*/ k_^/
public void sort(int[] data) { _5`S)G{
quickSort(data,0,data.length-1); %~(i[Ur;
} X',0MBQ0
private void quickSort(int[] data,int i,int j){ q _|5,_a
int pivotIndex=(i+j)/2; ?v~3zHK
//swap *pUV-^uo
SortUtil.swap(data,pivotIndex,j); xVX||rrh
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:
int k=partition(data,i-1,j,data[j]); nL20}"$E
SortUtil.swap(data,k,j); O;t?@!_
if((k-i)>1) quickSort(data,i,k-1); G6bg ~V5Q:
if((j-k)>1) quickSort(data,k+1,j); Vxs`w
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} t"vO&+x
/** Z6@J-<u
* @param data 'yjH~F.
* @param i !#s7 F
* @param j [t)i\ }V
* @return F76h
*/ Q31c@t
private int partition(int[] data, int l, int r,int pivot) { oT{yttSNo
do{ 9yAu<a
while(data[++l] while((r!=0)&&data[--r]>pivot); 1Sk6[h'CL
SortUtil.swap(data,l,r); Z*3}L
} qyfxT Q5
while(l SortUtil.swap(data,l,r); =_6h{f&Q
return l; ?O
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} rM.<Gi05Qe
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} )Dpt<}}\
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改进后的快速排序: [
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package org.rut.util.algorithm.support; !jnIXvT1qy
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import org.rut.util.algorithm.SortUtil; L4Y3\4xXO
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/** IomJo
* @author treeroot #vwXx r
* @since 2006-2-2 kovzB]
* @version 1.0 ;>Qd )'
*/ ha~s<
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public class ImprovedQuickSort implements SortUtil.Sort { N,$o'\l
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private static int MAX_STACK_SIZE=4096; 8QBL:7<
private static int THRESHOLD=10; MoHvXp;X
/* (non-Javadoc) ') y~d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )KQum`pO
*/ X;>} ;LiK
public void sort(int[] data) { =upP3rw
int[] stack=new int[MAX_STACK_SIZE]; H;&t"Ql.
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int top=-1; %;?3A#
int pivot; Z`t?kXDNoI
int pivotIndex,l,r; 1=.kH[R
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stack[++top]=0; +[9"M+4-
stack[++top]=data.length-1; XLxr~Yo
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while(top>0){ S`KCVQ>V
int j=stack[top--]; }dl(9H=4
int i=stack[top--]; rM |RGe
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pivotIndex=(i+j)/2; '|T=
pivot=data[pivotIndex]; OG`Oi^2
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SortUtil.swap(data,pivotIndex,j); zy;w07-)
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//partition S}O\<6&
l=i-1; u)pBFs<dn
r=j; czRh.kz,
do{ AFED YRX
while(data[++l] while((r!=0)&&(data[--r]>pivot)); .x%SbG<k{
SortUtil.swap(data,l,r); &N ;6G`3
} 4*W7{MPY
while(l SortUtil.swap(data,l,r); 4iW2hV@m
SortUtil.swap(data,l,j); [_@OCiV5)
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if((l-i)>THRESHOLD){ a-y5 \x
stack[++top]=i; `_i-BdW
stack[++top]=l-1; JY16|ia
} `_`,XkpzCJ
if((j-l)>THRESHOLD){ ic#drpl,
stack[++top]=l+1;
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stack[++top]=j; i-b7
} 6'zy"UkH
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} %}:J
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//new InsertSort().sort(data); 6B{Awm@v}X
insertSort(data); .5xM7,
} 'h6RZKG T
/** _: K\v8
* @param data OpQa!
*/ IIZsN*^
private void insertSort(int[] data) { _I!&w!3oM
int temp; kpu^:N&
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); (C%'I
} i$bBN$<b<
} H_FhHX.2(
} sTz*tSwQv
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} H"l'E9k.&p
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