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快速排序: 66-tNy
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package org.rut.util.algorithm.support; 14DhJUV"b
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import org.rut.util.algorithm.SortUtil; 2ck0k,WP
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/** (H8JV1J
* @author treeroot i1ScXKO
* @since 2006-2-2 NFyKTA6
* @version 1.0 GOOm] ]I
*/ {y'4&vt<~
public class QuickSort implements SortUtil.Sort{ ey6ujV7!
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/* (non-Javadoc) ~jzjJ&O&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OT0IGsJ"'
*/ }T-'""*
public void sort(int[] data) { 7,zE?KG /
quickSort(data,0,data.length-1); wYr*('uT
} 5^K\<+{~B
private void quickSort(int[] data,int i,int j){ {&J~P&,k
int pivotIndex=(i+j)/2; e%EO/ 2"
//swap msY6zJc`
SortUtil.swap(data,pivotIndex,j); c:[ZknnCe
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int k=partition(data,i-1,j,data[j]); m(D+!I9
SortUtil.swap(data,k,j); Y]tbwOle
if((k-i)>1) quickSort(data,i,k-1); 1|m%xX,[
if((j-k)>1) quickSort(data,k+1,j); RO@=&3s
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} R?IRE91 :
/** p| ?FA@ 3
* @param data 0Py*%}r1
* @param i w+wtr[;wwL
* @param j d<6m_!L
* @return CXi[$nF3
*/ bjo}95
private int partition(int[] data, int l, int r,int pivot) { 9s1^hW2%Q
do{ 7Ie=(x8):
while(data[++l] while((r!=0)&&data[--r]>pivot); *%Fu/
SortUtil.swap(data,l,r); 5+Ao.3Xn
} #qFY`fVf1
while(l SortUtil.swap(data,l,r); O4Q"2
return l; `?O0)
} 7MGvw-Tpb7
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} 3YJ"[$w='(
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改进后的快速排序: SF`(`h0e
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package org.rut.util.algorithm.support; l))Q/8H
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import org.rut.util.algorithm.SortUtil; )*`h)`\y
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/** (k8}9[3G
* @author treeroot KK6n"&TVa
* @since 2006-2-2 wSw> UU
* @version 1.0 6']HmM
*/ )XHn.>]nc
public class ImprovedQuickSort implements SortUtil.Sort { U
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private static int MAX_STACK_SIZE=4096; $rlrR'[H
private static int THRESHOLD=10; QZtQogNy#
/* (non-Javadoc) rOz1tY)l0d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >lfuo
*/ lj UdsU w
public void sort(int[] data) { R1D ;
int[] stack=new int[MAX_STACK_SIZE]; u`&lTJgF/O
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int top=-1; YM};85 K
int pivot; PfZS"yk
int pivotIndex,l,r; !?v_.
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stack[++top]=0; G[`1Yw$
stack[++top]=data.length-1; o+B)
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while(top>0){ 6i2%EC9
int j=stack[top--]; 0|J_'-<
int i=stack[top--]; 7}g4ePYag
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pivotIndex=(i+j)/2; 1`YU9?
pivot=data[pivotIndex]; (0B?OkQ
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SortUtil.swap(data,pivotIndex,j); &w#!
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//partition GB35o uE
l=i-1; #c5jCy}n
r=j; fx(h fz
do{ Pc_aEBq
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 76wNZv)9
SortUtil.swap(data,l,r); }f]Y^>-Ux
} Z &Ciy n
while(l SortUtil.swap(data,l,r); 5nUJ9sqA
SortUtil.swap(data,l,j); /("7*W 2
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if((l-i)>THRESHOLD){ i'7+
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stack[++top]=i; o6d x\
stack[++top]=l-1; t*=[RS*
} r!+{In+Z
if((j-l)>THRESHOLD){ W*t]
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stack[++top]=l+1; wWy;dma#
stack[++top]=j; @phVfP"M
} 'gvR?[!t
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} ocFk#FW
//new InsertSort().sort(data); %/"n(?$W
insertSort(data); Aeb(b+=
} 1[^YK6a/
/** #3QPcoxa
* @param data b7Jxv7$e
*/ iN[x
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private void insertSort(int[] data) { =9X1 +x
int temp; 68Gywk3]=u
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); _ i}W1i
} ;~EQS.Qp
} d51'[?(
} EU %,tp
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} !:^q_q4
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