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快速排序: K B!5u 9
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package org.rut.util.algorithm.support; wG1l+^p
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import org.rut.util.algorithm.SortUtil; ; Y"N6%
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/** 7AwgJb hn
* @author treeroot bl;zR
* @since 2006-2-2 n((vY.NDV
* @version 1.0 \L # INP4~
*/ A(8n
public class QuickSort implements SortUtil.Sort{ 2 rN ,D(
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/* (non-Javadoc) !2tW$BP^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9MY7a=5E~
*/ >\2:\wI
public void sort(int[] data) { "5Uh<X
quickSort(data,0,data.length-1); jZpa0g rA
} !TKkec8$
private void quickSort(int[] data,int i,int j){ ~Rpm-^
int pivotIndex=(i+j)/2; ua5?(,E`']
//swap _:g&,2bc
SortUtil.swap(data,pivotIndex,j); rJJ[X4$
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int k=partition(data,i-1,j,data[j]); ?4 S+edX
SortUtil.swap(data,k,j); G8Z 4J7^
if((k-i)>1) quickSort(data,i,k-1); ;eL9{eF
if((j-k)>1) quickSort(data,k+1,j); $t~@xCi]S
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} Rp9fO?ZjHt
/** Q`%R[#
* @param data /)
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* @param i ~utJB 'gr
* @param j (u3s"I
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* @return 6w[}&pX"z
*/ d[D&J
private int partition(int[] data, int l, int r,int pivot) { %+)o'nf"U
do{ (1R?s>3o
while(data[++l] while((r!=0)&&data[--r]>pivot); errH>D~
SortUtil.swap(data,l,r); E
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} iRV~Il#~!
while(l SortUtil.swap(data,l,r); ;`YkMS`=W
return l; P>ceeoYQuA
} }x0- V8
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} }[+!$#
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改进后的快速排序: i':i_kU
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package org.rut.util.algorithm.support; (>4aibA'P
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import org.rut.util.algorithm.SortUtil; mW2,1}Jv
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/** }9HmTr|
* @author treeroot J7D}%
* @since 2006-2-2 =]`lN-rYw
* @version 1.0 >_dx_<75&
*/ >T2LEW
public class ImprovedQuickSort implements SortUtil.Sort { 0Sq][W=
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private static int MAX_STACK_SIZE=4096; 4/ kv3rv
private static int THRESHOLD=10; VGHWNMT
/* (non-Javadoc) zya5Jb:Sg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A1)wo^,
*/ n79QJl/
public void sort(int[] data) { >d"3<S ;b
int[] stack=new int[MAX_STACK_SIZE]; Jj~EiA
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int top=-1; R[z`:1lo
int pivot; TD[EQ
int pivotIndex,l,r; ]5~s"fnG
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stack[++top]=0; :@W.K5
stack[++top]=data.length-1;
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while(top>0){ 0]QRsVz+
int j=stack[top--]; %75xr9yOP
int i=stack[top--]; b2 _Yu^
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pivotIndex=(i+j)/2; ?
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pivot=data[pivotIndex]; ZyOv.,y
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SortUtil.swap(data,pivotIndex,j); [7(-T?_
{3})=>u:S
//partition r`)L~/
l=i-1; M8H5K
r=j; 08X_}97#WF
do{ +`7KSwa
while(data[++l] while((r!=0)&&(data[--r]>pivot)); !D!~^\
SortUtil.swap(data,l,r); (-]r~Ol^
} G?f\>QSZ
while(l SortUtil.swap(data,l,r); hcVJBK
SortUtil.swap(data,l,j); J=.`wZQkS
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if((l-i)>THRESHOLD){ 2G$SpfeIu
stack[++top]=i; hTP:[w)
stack[++top]=l-1; $+.l*]
} 3@5=+z~CW
if((j-l)>THRESHOLD){ %uv?we7
stack[++top]=l+1; 0]D0{6x8
stack[++top]=j; VMoSLFp^R
} XLMb=T~S
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} !`!| Zw
//new InsertSort().sort(data); s2j['g5
insertSort(data); cYXM__
} Sa19q.~%
/** lL]y~u
* @param data + [Hh,I7
*/ Y(.OF
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private void insertSort(int[] data) { (98Nzgxgx}
int temp; f|u#2!7
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 8kP3+
} ?\8?%Qk
} 6_N(;6kx(
} k6=nO?$
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} bQ|V!mrN}
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