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快速排序: O26'|w@$
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package org.rut.util.algorithm.support; u`%Kh_
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import org.rut.util.algorithm.SortUtil; g;N)K3\2
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/** ]u;Ma
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* @author treeroot x1g0_&F
* @since 2006-2-2 9qhX\, h
* @version 1.0 5"x=kp>!d
*/ _$wXHONt
public class QuickSort implements SortUtil.Sort{ 'X()|{
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/* (non-Javadoc) XkG:1H;Q%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =qQH,{]c6
*/ ?CaMn b8
public void sort(int[] data) { Dd1\$RBo
quickSort(data,0,data.length-1); i|- 6
} ^A4bsoW
private void quickSort(int[] data,int i,int j){ i)vbmV
int pivotIndex=(i+j)/2; rQ_!/J[9
//swap ? {@UB*
SortUtil.swap(data,pivotIndex,j); d0@&2hO
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int k=partition(data,i-1,j,data[j]); jRk"#:
SortUtil.swap(data,k,j); m :6.
if((k-i)>1) quickSort(data,i,k-1); >8I?YT.
if((j-k)>1) quickSort(data,k+1,j); X/=*o;":
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} ,BUDo9h
/** WFl, u!"A
* @param data {F Ir|R&
* @param i cqP)1V]
* @param j ~OuK ewr\
* @return i ,[S1g
*/ 0^5*@vt
private int partition(int[] data, int l, int r,int pivot) { 75u5zD
do{ 4Nz@s^9
while(data[++l] while((r!=0)&&data[--r]>pivot); Y[(U~l,a+
SortUtil.swap(data,l,r); hJkP_(+J\
} SN${cs%
while(l SortUtil.swap(data,l,r); {8!\aYI
return l; W @X/Z8.(
} v;S_7#
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} k<bA\5K
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改进后的快速排序:
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package org.rut.util.algorithm.support; fyRSg B00$
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import org.rut.util.algorithm.SortUtil; b7thu5
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/** K
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* @author treeroot *%[L
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* @since 2006-2-2 2X:OS/
* @version 1.0 -y@#
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*/ 4pYscB
public class ImprovedQuickSort implements SortUtil.Sort { %K9 9_Cl3
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private static int MAX_STACK_SIZE=4096; !Vtj:2PQL
private static int THRESHOLD=10; 'Gr}<B$A3
/* (non-Javadoc) Q+Sx5JUR~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n9PCSl j
*/ OoG Nij
public void sort(int[] data) { BZ '63
int[] stack=new int[MAX_STACK_SIZE]; 6k1;62Ntk
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int top=-1; a#U2y"
int pivot; T-;|E^
int pivotIndex,l,r; (
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stack[++top]=0;
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stack[++top]=data.length-1; l r16*2.
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while(top>0){ _LYI#D
int j=stack[top--]; X,ES=J0
int i=stack[top--]; rw9 m+q
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pivotIndex=(i+j)/2; h(<2{%j
pivot=data[pivotIndex]; xcVF0%wVC
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SortUtil.swap(data,pivotIndex,j); =>y%Aj&4
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//partition GLS`1!
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r=j; HVG:q#=C
do{ E8`AU<
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 3 P)N,
SortUtil.swap(data,l,r); Cyn_UE
} @ 4ccZ&`
while(l SortUtil.swap(data,l,r); B1u.aa$
SortUtil.swap(data,l,j); u{Rgk:bn
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if((l-i)>THRESHOLD){
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stack[++top]=i; $,s"c(pv[,
stack[++top]=l-1; [v,Y-}wQ)
} t'7A-K=k3
if((j-l)>THRESHOLD){ l-~
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stack[++top]=l+1; #9's^}i
stack[++top]=j; eeix-Wt*E
} nQHQVcDs8
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} U?WS\Jji3!
//new InsertSort().sort(data); %UO ;!&K
insertSort(data); Z(~v{c %<
} xDsB%~
/** A;ti$jy
* @param data
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*/ f@)GiLC'"
private void insertSort(int[] data) { 3|Vh[iAa\
int temp; v\#1&</qd^
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); mO?yrM *
} K:<0!C!
} :m{;<LRV
} Bh%Yu*.f
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} ?gGmJl
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