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快速排序: \?T9v
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package org.rut.util.algorithm.support; Fw\Z[nh
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import org.rut.util.algorithm.SortUtil; 0ck3II
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/** Qa )+Tv
* @author treeroot 2WFZ6
* @since 2006-2-2 $a*7Q~4
* @version 1.0 =N\; ?eF(
*/ D48e30
public class QuickSort implements SortUtil.Sort{ :1j8!R5
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/* (non-Javadoc) -GPJ,S V>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CMW4Zqau*
*/ P7XZ|Td4*
public void sort(int[] data) { 49&i];:%7%
quickSort(data,0,data.length-1); +?o!"SJ
} uo]xC+^
private void quickSort(int[] data,int i,int j){ JpC=ACF
int pivotIndex=(i+j)/2; TsK!36cg
//swap [-_{3qq<e
SortUtil.swap(data,pivotIndex,j); =IsmPQKi
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int k=partition(data,i-1,j,data[j]); rtJER?A
SortUtil.swap(data,k,j); w>^(w<~Y
if((k-i)>1) quickSort(data,i,k-1); B\c_GX Uw
if((j-k)>1) quickSort(data,k+1,j); \~E?;q!
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} HdqB B
/** Bc"MOSV0
* @param data Yjc U2S"=P
* @param i W4^zKnH
* @param j [:cD
* @return jj2iF/
*/ Intuda7e1
private int partition(int[] data, int l, int r,int pivot) { b},2A'X
do{ *O~y6|U?
while(data[++l] while((r!=0)&&data[--r]>pivot); `5Kg[nB:
SortUtil.swap(data,l,r); s;OGb{H7
} Qq`S=:}~x
while(l SortUtil.swap(data,l,r); rz%~=Ca2j
return l; 3LLG#l)8
} qS/}aDk&
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改进后的快速排序: .h=n [`RB
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package org.rut.util.algorithm.support; {S{ %KkAV
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import org.rut.util.algorithm.SortUtil; m1pA]}Y/5o
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/** {wz)^A
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* @author treeroot ,^?g\&f(
* @since 2006-2-2 y2_rm
* @version 1.0 @^UgdD,BS,
*/ IAH"vHM
public class ImprovedQuickSort implements SortUtil.Sort { }S uj=oFp
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private static int MAX_STACK_SIZE=4096; Pl:4`oY3
private static int THRESHOLD=10; M=Ze)X\E*'
/* (non-Javadoc) \s*UUODWK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B.r^'>jQ
*/ spfW)v/T!
public void sort(int[] data) { D wJ^ W&*
int[] stack=new int[MAX_STACK_SIZE]; mBErU6?X,A
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int top=-1; 6v3l^~kc'
int pivot; ,yGbMOV
int pivotIndex,l,r; @\ y{q;
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stack[++top]=0; _,L_H[FN
stack[++top]=data.length-1; Q&]|W
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while(top>0){ ]!{S2x&"
int j=stack[top--]; ]M*`Y[5"
int i=stack[top--]; I:TbZ*vi~
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pivotIndex=(i+j)/2; S=r0tao,!v
pivot=data[pivotIndex]; TxPFl7,r
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SortUtil.swap(data,pivotIndex,j); ; R+>}6
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//partition e
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l=i-1; Sxq@W8W
r=j; ck{S
do{ T5u71C_wmt
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 1- s(v)cxh
SortUtil.swap(data,l,r); ^5E9p@d"J
} Pjs=n7
while(l SortUtil.swap(data,l,r); (SRY(q
SortUtil.swap(data,l,j); ~6i'V?>
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if((l-i)>THRESHOLD){ 61H_o7XXk
stack[++top]=i; Xb%Q%"?~
stack[++top]=l-1; vWoppt
} !ddyJJ^a
if((j-l)>THRESHOLD){ Q[#}Oh6$
stack[++top]=l+1; ?0t^7HMP
stack[++top]=j; >*{k~Y-G
} IADHe\.
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} T<0 r,
//new InsertSort().sort(data); HQP.7.w7 5
insertSort(data); Li6|c*K'
} MMFg{8
/** G*N[t w
* @param data `Qo37B2
*/ j$q5m 24L
private void insertSort(int[] data) { ~wDXjn"U&
int temp; I0zx'x)F
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); qqw P4ceG
} _!o8s%9be
} $!*>5".A
} /3aW 0/^o
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} )9`HO?
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