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快速排序: Gh'X.?3
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package org.rut.util.algorithm.support; Y3<b~!f
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import org.rut.util.algorithm.SortUtil; l/M[am
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/** 9l#gMFknI
* @author treeroot v[VC2D
* @since 2006-2-2 P0)AUi
* @version 1.0 vnL?O8`c
*/ D!S8oKW
public class QuickSort implements SortUtil.Sort{ {a.
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/* (non-Javadoc) gn^!"MN+g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -8/ JP
*/ k&!6fZ)
public void sort(int[] data) { \ZsP]};*
quickSort(data,0,data.length-1); !O 8.#+
} Gp8psH
private void quickSort(int[] data,int i,int j){ gX_SKy
int pivotIndex=(i+j)/2; ~{$L9;x
//swap :s]\k%"
SortUtil.swap(data,pivotIndex,j); a5)JkC
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int k=partition(data,i-1,j,data[j]); &1l~&,,
SortUtil.swap(data,k,j); >P<'L4;
if((k-i)>1) quickSort(data,i,k-1); T=>vh*J
if((j-k)>1) quickSort(data,k+1,j); [EruyWK
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} JL``iA
/** vbaC+AiX
* @param data djfU:$!j&
* @param i L0xsazX:x
* @param j {pC\\}
* @return (7~%B"
*/ 7VY8CcL
private int partition(int[] data, int l, int r,int pivot) { >MPa38
do{ m@[3~
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while(data[++l] while((r!=0)&&data[--r]>pivot); S}b~_}
SortUtil.swap(data,l,r); ;P8(Zf3wJb
} dWUUxKC
while(l SortUtil.swap(data,l,r); {m'AY)
return l; +!><5
} ($'V&x8T
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} %mu>-h ac
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改进后的快速排序: ?M~
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package org.rut.util.algorithm.support; %4/xH9
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import org.rut.util.algorithm.SortUtil; ]w-.|vx
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/**
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* @author treeroot c$A@T~$
* @since 2006-2-2 *Dc@CmBr
* @version 1.0 j76%UG\Ga
*/ .`+yo0O:
public class ImprovedQuickSort implements SortUtil.Sort { e[8UH =`|
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private static int MAX_STACK_SIZE=4096; -K^41W71
private static int THRESHOLD=10; "koo` J
/* (non-Javadoc) SiR\a!, C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R>HY:-2
*/ h$/JGm5uDb
public void sort(int[] data) { USFg_sO
int[] stack=new int[MAX_STACK_SIZE]; U=DEV7 E
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int top=-1; OpUA{P
int pivot; *:S~C
int pivotIndex,l,r; 5*+I
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stack[++top]=0; A_F0\ EN*
stack[++top]=data.length-1; tah}^
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while(top>0){ U(Z!J6{c
int j=stack[top--]; =f `=@]
int i=stack[top--]; TzY*;
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pivotIndex=(i+j)/2; Qi^;1&
pivot=data[pivotIndex]; .<.#aY;N
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SortUtil.swap(data,pivotIndex,j); ;W6-i2?
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//partition HzEGq,.
l=i-1; CW;m
r=j; y!hi"!
do{ A Iv<f9*.:
while(data[++l] while((r!=0)&&(data[--r]>pivot)); }DHUTP2;yz
SortUtil.swap(data,l,r); Y;g% e3nu
}
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while(l SortUtil.swap(data,l,r); BV1u,<T"
SortUtil.swap(data,l,j); }<&d]N
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if((l-i)>THRESHOLD){ 3Y(9\}E@`
stack[++top]=i; X|Dpt2A=
stack[++top]=l-1; #fj[kq)&S
} qy&\Xgn;GA
if((j-l)>THRESHOLD){ z{/LX
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stack[++top]=l+1; 2qXo{C3
stack[++top]=j; [Xq<EEb
} o?y"]RCM
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} _Fxe|"<^
//new InsertSort().sort(data); :cdQ(O.m
insertSort(data); r@Nl2
} &+]x;K
/** P=Puaz5&{
* @param data J?,?fqb
*/ dk8y>uLr_
private void insertSort(int[] data) { 1w17L]4
int temp; .jaZ|nN8`
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); + ~~ Z0.[
} ]zcV]Qj$~
} cyBW0wV1
} }k| g%HJ
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} 7IQqN&J
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