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快速排序: Q:5KZm[ [
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package org.rut.util.algorithm.support; Ntbg`LGf'!
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import org.rut.util.algorithm.SortUtil; Dq)j:f#QM
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/** |m2X+s9
* @author treeroot DG?"5:Zd
* @since 2006-2-2 Ps 8%J;
* @version 1.0 CP6LHkM9
*/ Qci4J
public class QuickSort implements SortUtil.Sort{ i F+vl]
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/* (non-Javadoc) %?m$`9yU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) HQB(*
*/ 8H_l:Z [:i
public void sort(int[] data) { D_x+:1(
quickSort(data,0,data.length-1); 4T=u`3pD7l
} kV38`s>+
private void quickSort(int[] data,int i,int j){ N2w"R{) j\
int pivotIndex=(i+j)/2; 0C>%LJ8r
//swap ezMI\r6
SortUtil.swap(data,pivotIndex,j); =MvjLh"s
. Z%{'CC
int k=partition(data,i-1,j,data[j]); U{VCZ*0cj
SortUtil.swap(data,k,j); e/^=U7:io
if((k-i)>1) quickSort(data,i,k-1); f-%NaTI
if((j-k)>1) quickSort(data,k+1,j); SXy=<%ed
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}
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/** 'z$Q rFW
* @param data Jm42b4
* @param i bP^Je&nS*
* @param j d20gf:@BM
* @return B`
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*/ phgm0D7
private int partition(int[] data, int l, int r,int pivot) { aAB`G3
do{ =J ym%m
while(data[++l] while((r!=0)&&data[--r]>pivot); q#8 [
SortUtil.swap(data,l,r); 0q'w8]m
} L>YU,I\o
while(l SortUtil.swap(data,l,r); PpgP&;z4
return l; lhkwWbB
} YiPoYlD*n<
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} |gU(s
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改进后的快速排序: o9H^?Rut
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package org.rut.util.algorithm.support; O/<K!;(@?
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import org.rut.util.algorithm.SortUtil; 1u6^z
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/** (t4&,W_spA
* @author treeroot +9")KQT
* @since 2006-2-2 ~SnSEhE
* @version 1.0 VL*ovD%-
*/ Et/&^&=\-
public class ImprovedQuickSort implements SortUtil.Sort { !Uq^7Mw
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private static int MAX_STACK_SIZE=4096; v_nj$1dY6
private static int THRESHOLD=10; V7Mh-]
/* (non-Javadoc) iySRY^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >mjNmh7
*/ YxP@!U9dE,
public void sort(int[] data) { <NuUW9+
int[] stack=new int[MAX_STACK_SIZE]; `YIf_a{
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int top=-1; 48*Do}l]
int pivot; u6bXv(
int pivotIndex,l,r; o!!yd8~*r
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stack[++top]=0; pb=cBZ$
stack[++top]=data.length-1; 7__Q1>o
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while(top>0){ &Y^WP?HS
int j=stack[top--]; yfC^x%d7G
int i=stack[top--]; 1hziXC0WY
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pivotIndex=(i+j)/2; ;asP4R=
pivot=data[pivotIndex]; QJ7L7S
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SortUtil.swap(data,pivotIndex,j); /)>s##p*
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//partition a@0BBihz
l=i-1; *7wAkljP
r=j; =F;.l@:
do{ :bC40@
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Z>^pCc\lH
SortUtil.swap(data,l,r); YR;^hs?
} <E0UK^-}
while(l SortUtil.swap(data,l,r); |USX[jm\
SortUtil.swap(data,l,j); 1 %,a =,v
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if((l-i)>THRESHOLD){ MC{
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stack[++top]=i; 44F`$.v96
stack[++top]=l-1; Rh>}rGvCUN
} Ey4z.s'-l
if((j-l)>THRESHOLD){ qvv2O1c"A
stack[++top]=l+1; r{rQu-|.
stack[++top]=j; Uv4`6>Ix
} z$kenhFG/
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} 4sP2g&