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快速排序: /P8eI3R
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package org.rut.util.algorithm.support; 4}_w4@(
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import org.rut.util.algorithm.SortUtil; xU\:Vid+A
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/** Alk*
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* @author treeroot l&^[cR
* @since 2006-2-2 _7j/[
* @version 1.0 4Utx
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*/ #;*ai\6>vD
public class QuickSort implements SortUtil.Sort{ 4Tzu"y
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/* (non-Javadoc) &A5[C{x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =<FZ{4
*/ a+a%}76N
public void sort(int[] data) { {R{%Z
quickSort(data,0,data.length-1); : .w'gU_
} ]kplb0`
private void quickSort(int[] data,int i,int j){ 4;c_ %=cU
int pivotIndex=(i+j)/2; VY&9kN
//swap 85@6uBh
SortUtil.swap(data,pivotIndex,j); 8DS5<
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int k=partition(data,i-1,j,data[j]); 1d@^,7MF-
SortUtil.swap(data,k,j); %{VI-CQ
if((k-i)>1) quickSort(data,i,k-1); yYg&'3
if((j-k)>1) quickSort(data,k+1,j); OB
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} 'a{5}8+8
/** K{w=qJBM
* @param data _2!e!Z
* @param i ^nm!NL{z^
* @param j eP'kY(g8
* @return cSs/XJZ
*/ ?>\]%$5o
private int partition(int[] data, int l, int r,int pivot) { 3]]6z K^i
do{ "vRqtEBO@
while(data[++l] while((r!=0)&&data[--r]>pivot); 5~R{,]52
SortUtil.swap(data,l,r); 0_zSQn9c
} 3^-)gK
while(l SortUtil.swap(data,l,r); w*ktx{
return l; N8(x),
} z` ?xS
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} }]GK@nn7
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改进后的快速排序: %C][E^9
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package org.rut.util.algorithm.support; |Gs-9+'y
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import org.rut.util.algorithm.SortUtil; v%7JZ<I'A
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/** n2hsG.4
* @author treeroot GQ)cUrXQz
* @since 2006-2-2 ^yZSCrPGI
* @version 1.0 b`Ek;nYek
*/ K~%5iVO~\
public class ImprovedQuickSort implements SortUtil.Sort { B;7s ]R
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private static int MAX_STACK_SIZE=4096; Cv7RCjMw
private static int THRESHOLD=10; ~HI0<;r=eL
/* (non-Javadoc) s ;Nu2aOp7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XUNgt(OGR'
*/ 5h^qtK
public void sort(int[] data) { (9_e>2_
int[] stack=new int[MAX_STACK_SIZE]; $`{q =
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int top=-1; ]Oh>ECA|D
int pivot; CrX-?$
int pivotIndex,l,r; ?iO^b.'I#
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stack[++top]=0; \mit&EUh}
stack[++top]=data.length-1; A_
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while(top>0){ P3FpU<OBwp
int j=stack[top--]; &|FG#.2yw
int i=stack[top--]; yXl.Gq>]{
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pivotIndex=(i+j)/2; W]7?;#Hpk
pivot=data[pivotIndex]; /!8:/7r+W
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SortUtil.swap(data,pivotIndex,j); dsoRPX']=
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//partition JkEQ@x
l=i-1; -;.fU44O[#
r=j; }(O
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do{ 1L9
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); EHJc*WFPU-
SortUtil.swap(data,l,r); H t$%)j9
} o|.me G
while(l SortUtil.swap(data,l,r); b|'LtL$Y
SortUtil.swap(data,l,j); *hgsS~
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if((l-i)>THRESHOLD){ g@i
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stack[++top]=i; 1:V/['|*g)
stack[++top]=l-1; 6UP3Ij
} hrxASAfg6
if((j-l)>THRESHOLD){ iU|C<A%Hh
stack[++top]=l+1; -/*{^[
stack[++top]=j; ViONG]F
} uty]-k
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} 2a}_|#*
//new InsertSort().sort(data); @WUCv7U
insertSort(data); Gwk@X/q
} 3p#^#1/_
/** lsxii-#O
* @param data j}Mpc;XOc
*/ M/ \~
private void insertSort(int[] data) { 49>yIuG
int temp; +eat,3Ji
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); %tjEVQa
} Q'LU?>N)/
} ,
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}
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} }Q*ec/^{f
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