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快速排序: UA}oOteG
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package org.rut.util.algorithm.support; d4zqLD$A
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import org.rut.util.algorithm.SortUtil; T&`H )o
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/** :X6A9jmd
* @author treeroot _n+./B
* @since 2006-2-2 #e8NF,H5
* @version 1.0 SQB[d3f
*/ )FrXD3p
public class QuickSort implements SortUtil.Sort{ P7GF"/
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/* (non-Javadoc) Ug^v
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7 n=fB#!*3
*/ {r!X W
public void sort(int[] data) { yXx}'=&!0
quickSort(data,0,data.length-1); hD:$Sv/H
} E|Lv_4lb=
private void quickSort(int[] data,int i,int j){ %r*zd0*<n1
int pivotIndex=(i+j)/2; 'j+J?Y^
//swap A"@C }f
SortUtil.swap(data,pivotIndex,j); {6yiD
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int k=partition(data,i-1,j,data[j]); =K)au$BE|
SortUtil.swap(data,k,j); GUyc1{6
if((k-i)>1) quickSort(data,i,k-1); EI29;
if((j-k)>1) quickSort(data,k+1,j); $iA`_H`W
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} 3Yd)Fm
/** H+>l][
* @param data ZdD]l*.\i
* @param i Rz!E=1Y$
* @param j F*_mHYa;
* @return H[{ch t
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*/ \5%T'S@5
private int partition(int[] data, int l, int r,int pivot) { 0r+%5}|-K
do{ uz1t uX_
while(data[++l] while((r!=0)&&data[--r]>pivot); |'2E'?\/x
SortUtil.swap(data,l,r); P2`!)teN
} ~ 0x9`~
while(l SortUtil.swap(data,l,r); V}>0r+NL<
return l; nO~TW
} TY=BP!s
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} 4V7{5:oa
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改进后的快速排序: <o_H]c->
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package org.rut.util.algorithm.support; Cp_YIcnEJ
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import org.rut.util.algorithm.SortUtil; :LL>C)(f
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/** yS#LT3>l
* @author treeroot )h~MIpWR
* @since 2006-2-2 SZCFdb
* @version 1.0 L`ZH.fN
*/ wL2d.$?TEg
public class ImprovedQuickSort implements SortUtil.Sort { W)F2X0D>
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private static int MAX_STACK_SIZE=4096; ~mtL\!vaM
private static int THRESHOLD=10; xcz1(R
/* (non-Javadoc) Mp~E$f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R4"g?
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*/ !m$OI:rr
public void sort(int[] data) { -,~n|ceI
int[] stack=new int[MAX_STACK_SIZE]; (d[)U<
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int top=-1; MS6^= ["
int pivot; {O6f1LuH
int pivotIndex,l,r; oUm"qt_
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stack[++top]=0; $+sNjwv^F
stack[++top]=data.length-1; N"b>]Ab] ;
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while(top>0){ w*ig[{
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int j=stack[top--]; Got5(^'c
int i=stack[top--]; V&DS+'P
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pivotIndex=(i+j)/2; EeKEw
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pivot=data[pivotIndex]; r}P{opn$t
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SortUtil.swap(data,pivotIndex,j); J%3%l5/
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//partition i` Es7 }
l=i-1; X; T(?,,
r=j; :JqH.Sqk
do{
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); lhx6+w
SortUtil.swap(data,l,r); L^VG?J
} <!&&Qd-d6H
while(l SortUtil.swap(data,l,r); DL2gui3
SortUtil.swap(data,l,j);
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if((l-i)>THRESHOLD){ ~l-Q0wg
stack[++top]=i; "}|n;:r
stack[++top]=l-1; <UG}P \N
} `I<*R0Qe
if((j-l)>THRESHOLD){ W\zg#5fmK
stack[++top]=l+1; HW{osav9
stack[++top]=j; $CO^dFf
} K!k,]90Ko
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} H.j(hc'
//new InsertSort().sort(data); 6d,jR[JP
insertSort(data); bxO8q57
} )2z
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/** 'uBW1,
* @param data L!DP*XDp
*/ ?DkMzR)u
private void insertSort(int[] data) { eQno]$-\
int temp; \no[>L]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); *:3flJt
} `Bnp/9q5
} \A _g
} +is;$1rq
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} yuk64o2QE
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