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快速排序: e*!kZAf
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package org.rut.util.algorithm.support; 3[&C g
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import org.rut.util.algorithm.SortUtil; h1{3njdr
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/** ]HdCt 3X
* @author treeroot qa6,z.mQ
* @since 2006-2-2 Jl<2>@
* @version 1.0 5coZ|O&f8
*/ rH>)oThA#
public class QuickSort implements SortUtil.Sort{ 875od
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/* (non-Javadoc) smLQS+UE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *j-aXN/ $
*/ &0f,~ /%Z
public void sort(int[] data) { `-&K~^-cH
quickSort(data,0,data.length-1); Df#l8YK#
} I0a<%;JJW
private void quickSort(int[] data,int i,int j){ iI>A *,{,`
int pivotIndex=(i+j)/2; Jo}eeJ;k
//swap vFsLY
SortUtil.swap(data,pivotIndex,j); ??T#QQ
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int k=partition(data,i-1,j,data[j]); L+QLLcS~EM
SortUtil.swap(data,k,j); Fx+*S3==%e
if((k-i)>1) quickSort(data,i,k-1); $SE^S
if((j-k)>1) quickSort(data,k+1,j); 1.X@;
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} i LAscb
/** TPY}C
* @param data nOz.G"
* @param i ;$tSb ~K+
* @param j !a<ng&H^U
* @return H.2QKws^F
*/ J$!iq|
private int partition(int[] data, int l, int r,int pivot) { '{`$#@a.
do{ @A5?3(e
while(data[++l] while((r!=0)&&data[--r]>pivot); T^v}mWCZ
SortUtil.swap(data,l,r); >*n0n!vF
} y Wya&|D9
while(l SortUtil.swap(data,l,r); gO^gxJ'0t
return l; =ruao'A
} _y>~
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改进后的快速排序: %#}Z y
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package org.rut.util.algorithm.support; rD>f|kA?L
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import org.rut.util.algorithm.SortUtil; mQ=#nk$~g
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/** `g})|Gx
* @author treeroot @vB!u[{
* @since 2006-2-2 3 9|MX21k
* @version 1.0 4H-'Dr=G
*/ Tqk\XILG N
public class ImprovedQuickSort implements SortUtil.Sort { 'eX '
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private static int MAX_STACK_SIZE=4096; ,=:D
private static int THRESHOLD=10; /SrAW`;"
/* (non-Javadoc) "Yca%:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @]#1(9P
*/ w-{c.x
public void sort(int[] data) { e!r-+.i(
int[] stack=new int[MAX_STACK_SIZE]; AvHCO8h|
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int top=-1; pBPl6%C.X-
int pivot; !3v1bGk
int pivotIndex,l,r; 2"S}bfrX
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stack[++top]=0; N&V`K0FU
stack[++top]=data.length-1; g>9kXP+
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while(top>0){ 'Qo*y%{@5
int j=stack[top--]; L~>i,
int i=stack[top--]; Y5d \d\e/
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pivotIndex=(i+j)/2; p[lA\@l[
pivot=data[pivotIndex]; GDy9qUV
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SortUtil.swap(data,pivotIndex,j); Rx|;=-8zg
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//partition Y]5l.SV
l=i-1; Zsh9>]ML
r=j; Pco'l#:
do{ v 6Vcjm
while(data[++l] while((r!=0)&&(data[--r]>pivot)); v]c6R-U
SortUtil.swap(data,l,r); $lut[o74
} n\.V qe
while(l SortUtil.swap(data,l,r); LYg-
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SortUtil.swap(data,l,j); HX{`VahE
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if((l-i)>THRESHOLD){ A_#DJJMm
stack[++top]=i; !&Pui{F
stack[++top]=l-1; D#/Bx[
} T${Q.zHY[!
if((j-l)>THRESHOLD){ N{~YJ$!8
stack[++top]=l+1; 3 SGDy]
stack[++top]=j; m<g~H4
} o\)F}j&b#=
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} f0aKlhEC
//new InsertSort().sort(data); gOOPe5+ J
insertSort(data); Vl!6W@g
} (NnH:J`
/** t>B;w14
* @param data <kd1Nrr!p
*/ SG4%}wn%
private void insertSort(int[] data) { BIWWMg
int temp; [\b0Lem
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 8&Y^""#e)
} M+9 gL3W
} #`X?=/q
} ApXy=?fc
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} 9,'ncw$/C
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