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快速排序: Ltq*Vcl\
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package org.rut.util.algorithm.support; ybuSqFy`$
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import org.rut.util.algorithm.SortUtil; 30T:* I|
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/** 'yAoZ P\|
* @author treeroot i}&mz~
* @since 2006-2-2 P.2.Ge|
* @version 1.0 B39PDJ]hu
*/ L-oPb)
public class QuickSort implements SortUtil.Sort{ |^&2zyUj/
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/* (non-Javadoc) }E\+e!'!2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Fw8X$SE"
*/ tg%WVy2
public void sort(int[] data) { 5eZg+ O
quickSort(data,0,data.length-1); xQ(KmP2hl
} dpOL1rrE
private void quickSort(int[] data,int i,int j){ ~d<`L[
int pivotIndex=(i+j)/2; iLQt9Hyk
//swap 8G^B%h]
SortUtil.swap(data,pivotIndex,j); %RR|QY*
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int k=partition(data,i-1,j,data[j]); uq1(yyWp(
SortUtil.swap(data,k,j); }A&Xxh!Fwo
if((k-i)>1) quickSort(data,i,k-1); vpr@
if((j-k)>1) quickSort(data,k+1,j); OuJy$e
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} YH'.Yj2
/** _ZE$\5>-
* @param data E9+O\"e9
* @param i ~.y4
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* @param j Ph!NYi,
* @return x_^OS"h-
*/ 0 6v5/Xf
private int partition(int[] data, int l, int r,int pivot) { 68G] a N3
do{ whp\*]8
while(data[++l] while((r!=0)&&data[--r]>pivot); U\!LZ?gC
SortUtil.swap(data,l,r); MxvxY,~{0
} ~a0}
while(l SortUtil.swap(data,l,r); d'@H@
return l; #(wzl
} TKs@?Q,J
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} K&~#@I;
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改进后的快速排序: 1*`JcUn,>
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package org.rut.util.algorithm.support; KcyM2hE7
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import org.rut.util.algorithm.SortUtil; RgzSaP;;
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/** 8X~vJ^X9@y
* @author treeroot 5r}(|86O/
* @since 2006-2-2 `uJ l<kHI
* @version 1.0 L\'qAfR Z
*/ VH1c)FI
public class ImprovedQuickSort implements SortUtil.Sort { s/'h LkxI
w+TuS).
private static int MAX_STACK_SIZE=4096; FXwK9
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private static int THRESHOLD=10; ra#)*fG,~
/* (non-Javadoc) aNf3 R; *
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n7YWc5:CaL
*/ yDBgSO{d
public void sort(int[] data) { u2Z^iY
int[] stack=new int[MAX_STACK_SIZE]; G5@fqh6ws
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int top=-1; Fm+)mmJP
int pivot; 'C4Ll2
int pivotIndex,l,r; N`GwL
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stack[++top]=0; {qdhp_~^l
stack[++top]=data.length-1; ?fX8WRdh
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while(top>0){ fi@+swfc
int j=stack[top--]; *:\9T#h
int i=stack[top--]; `pS)qx.a
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pivotIndex=(i+j)/2; #a>!U'1|
pivot=data[pivotIndex]; G6ES]
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SortUtil.swap(data,pivotIndex,j); TVh7h`Eg
:s985sEv
//partition [
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l=i-1; F[giq1#
r=j; X#C7r@H
do{ X{5 DPhB,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); I }I/dh
SortUtil.swap(data,l,r); #AnSjl
} YU"\Wd[
while(l SortUtil.swap(data,l,r); B{i;+[ase
SortUtil.swap(data,l,j); uWT&`m_(2
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if((l-i)>THRESHOLD){ w)>z3Lm
stack[++top]=i; ?)<XuMh
stack[++top]=l-1; xb_:9
} a^1c _
if((j-l)>THRESHOLD){
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stack[++top]=l+1; @+vTGjHA
stack[++top]=j; Kt7x'5
} Ln
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} 9
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//new InsertSort().sort(data); $?Mz[X
insertSort(data); Lj AIB(*
} -H;y_^2
/** h>Pg:*N,(
* @param data $
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*/ u(a&x|WY
private void insertSort(int[] data) { 6?x{-Zj^?
int temp; ~7H.<kJt
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); _cs9R%
} \r9%;?f
} Q 8E~hgO
} }iloX#
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} oh)l\
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