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快速排序: ;pNHT*>u,
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package org.rut.util.algorithm.support; pTK|u!fs
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import org.rut.util.algorithm.SortUtil; c])b?dJ*
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/** v; ;X2 a1k
* @author treeroot _rqOzE)
* @since 2006-2-2 >M^
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* @version 1.0 AAdRuO{l1
*/ q$`:/ ehw
public class QuickSort implements SortUtil.Sort{ kI3-G~2
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/* (non-Javadoc) 0{Kl5>Z9M
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zux+ooU
*/ |b/J$.R
public void sort(int[] data) { ]T(O;y*m
quickSort(data,0,data.length-1); Md
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private void quickSort(int[] data,int i,int j){
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int pivotIndex=(i+j)/2; KW&&AuPb}
//swap q'2PG@
SortUtil.swap(data,pivotIndex,j); -H`G6oMOO
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int k=partition(data,i-1,j,data[j]); VSZ 6;&2^
SortUtil.swap(data,k,j); FzpWT-jnDd
if((k-i)>1) quickSort(data,i,k-1); S53%*7K.
if((j-k)>1) quickSort(data,k+1,j); nHKEtKDd
0 $e;#}
} _|TE )h
/** uU.9*B=H9
* @param data 2,&lGyV#
* @param i !Y]}&pUP
* @param j `z` `d*_
* @return XU9=@y+|v
*/ R/^JyL
private int partition(int[] data, int l, int r,int pivot) {
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do{ m4Wn$Z
while(data[++l] while((r!=0)&&data[--r]>pivot); g-p
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SortUtil.swap(data,l,r); SC2C%.%l`
} qqzQKN
while(l SortUtil.swap(data,l,r); : 6>H\
return l; HB`pK'gz
} cfeX(0
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} N@MeaO
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改进后的快速排序: 3^Yk?kFE
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package org.rut.util.algorithm.support; 3Gp4%UT&
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import org.rut.util.algorithm.SortUtil; )i_FU~ LRq
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/** m]-8?B1`Y
* @author treeroot ~2H7_+.#
* @since 2006-2-2 Jl]]nOBQ/
* @version 1.0 km c9P&
*/ u=E?N:I~F
public class ImprovedQuickSort implements SortUtil.Sort { '-i
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private static int MAX_STACK_SIZE=4096; %o"Rcw|
private static int THRESHOLD=10; ax^${s|{-
/* (non-Javadoc) /a$+EQ$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D`t e|K5
*/ rmMO-!s
public void sort(int[] data) { Yip9K[
int[] stack=new int[MAX_STACK_SIZE]; >|Jw,,uf
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int top=-1; 0[1!K&(L
int pivot; m@O\Bi}=}
int pivotIndex,l,r; L\Jl'r|
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stack[++top]=0; %C3cdy_c
stack[++top]=data.length-1; xapkhIW2\
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while(top>0){ }a9C/t3
int j=stack[top--]; p_z"Uwp
int i=stack[top--]; sRZ:9de+
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pivotIndex=(i+j)/2; O h"^
pivot=data[pivotIndex]; i9xv`Ev=R
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SortUtil.swap(data,pivotIndex,j); X#3<hN*v
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//partition jO,<7FPs5
l=i-1; FvJSJ.;E,
r=j; s{k\1P(G}
do{ 4w
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); -Y[-t;
SortUtil.swap(data,l,r); Yjl0Pz.q
} `{wku@
while(l SortUtil.swap(data,l,r); e6R"W9
SortUtil.swap(data,l,j); yQA[X}
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if((l-i)>THRESHOLD){ WsV3>=@f
stack[++top]=i; *h4m<\^U
stack[++top]=l-1; .]e6TFsrO
} btF%}<o)
if((j-l)>THRESHOLD){ _Y|kX2l
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stack[++top]=l+1; cik@QN<[0
stack[++top]=j; V[I<9xaE
} 0l6iv[qu5w
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} Q#Y3%WF
//new InsertSort().sort(data); H n!vTB
insertSort(data); h(8;7}K
} o3yqG#dA
/** (7b_g6>:
* @param data ]-'9|N*}l
*/ spx;QLo
private void insertSort(int[] data) { gk z#kiGF
int temp; nwo!A3w:
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); be/1-=m
} n`}&,UA$4
} 3rY /6{
} Mak9qaWqF>
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} GzXP
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