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快速排序: [u/W h+
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package org.rut.util.algorithm.support; UjS,<>fm
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import org.rut.util.algorithm.SortUtil; o,=dm@j
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/** )dI `yf
* @author treeroot Y/G~P,9
* @since 2006-2-2 n7'X.=o7
* @version 1.0 Na_O:\x#
*/ ^9oJuT!tu
public class QuickSort implements SortUtil.Sort{ }<G#bh6;Q
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/* (non-Javadoc) rFYw6&;vOi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R"[U<^
*/ [!b=A:@
public void sort(int[] data) { s;YuB#Z
quickSort(data,0,data.length-1); gJuA*^
} EY[J;H_b
private void quickSort(int[] data,int i,int j){ q! }O+(kt
int pivotIndex=(i+j)/2; Y
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//swap l\~F0Z/O
SortUtil.swap(data,pivotIndex,j); EB[B0e7}
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int k=partition(data,i-1,j,data[j]); 47
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SortUtil.swap(data,k,j); g2GHsVS
if((k-i)>1) quickSort(data,i,k-1); c=~FXV!
if((j-k)>1) quickSort(data,k+1,j); Vw b6QIs
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} $rmfE
/** Y+_t50S
* @param data W=
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* @param i r7n-Xe
* @param j u6~/"
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* @return K1^x+I7%U[
*/ ]"4\]_?r
private int partition(int[] data, int l, int r,int pivot) { x)^t5"F
do{ f hr
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while(data[++l] while((r!=0)&&data[--r]>pivot); ;TG<$4N
SortUtil.swap(data,l,r); yX|0R
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} / FA0(< -}
while(l SortUtil.swap(data,l,r); KJN{p~Q
return l; e'1}5Ky
} Ra^GbT|Z
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} Cw&U*H
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改进后的快速排序: 8yn}|Y9Fu
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package org.rut.util.algorithm.support; SpiI9)gp
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import org.rut.util.algorithm.SortUtil; e2$k
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/** K
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* @author treeroot JO"-"&>
* @since 2006-2-2 sc
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* @version 1.0 fr([g?F%D
*/ eU.HS78
public class ImprovedQuickSort implements SortUtil.Sort { q~*>
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private static int MAX_STACK_SIZE=4096; w-9fskd6e
private static int THRESHOLD=10; ([L5i&DT
/* (non-Javadoc) 0'4V*Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fI1,L"
*/ !_My]>S
public void sort(int[] data) { 8\@&~&(y:
int[] stack=new int[MAX_STACK_SIZE]; nA>kJSL'$
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int top=-1; .3yxg}E>{
int pivot; Q,z^eMk'd:
int pivotIndex,l,r; >@9>bI+Q
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stack[++top]=0; *FrlzIAom
stack[++top]=data.length-1; yUzpl[*e^o
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while(top>0){ RkuPMs
Hw;
int j=stack[top--]; U k*HRudt
int i=stack[top--]; Z
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pivotIndex=(i+j)/2; ffqz
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pivot=data[pivotIndex]; .,5N/p"aV
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SortUtil.swap(data,pivotIndex,j); fd}
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//partition (:2,Rr1"
l=i-1; _.y0QkwV
r=j; ^q=D!g
do{ _@Le MNv
while(data[++l] while((r!=0)&&(data[--r]>pivot)); llP
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SortUtil.swap(data,l,r); JD}"_,-
} l.Qv9Ll|b
while(l SortUtil.swap(data,l,r); ">^O{X\
SortUtil.swap(data,l,j); w0iv\yIRQ
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if((l-i)>THRESHOLD){ 0kdPr:B Q0
stack[++top]=i; N?mTAF'M
stack[++top]=l-1; KixS)sG
} r|>a;nY
if((j-l)>THRESHOLD){ YYc.e T<
stack[++top]=l+1; b;XUv4~V
stack[++top]=j; nR1QS_@{L
} qvH7 otA
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} >u:t2DxE
//new InsertSort().sort(data); mgxoM|n6
insertSort(data); #}Qzu~
} mOkf
/** DlWnz-
* @param data P:gN"f6
*/ ;P#c!
private void insertSort(int[] data) { xbv
int temp; 5_MqpCL
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); M{ mdh\
} QXcSDJ
} u'BuZF
} :"4Pr/}rT
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} |*+f N8
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