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快速排序: *Ei~2O}
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package org.rut.util.algorithm.support; QV{Nq=%]
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import org.rut.util.algorithm.SortUtil; l:+tl/
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/** 4I:Jb;k>
* @author treeroot (`3Bi]7
* @since 2006-2-2
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* @version 1.0 y>~=o9J_u
*/ SjlkKulMF
public class QuickSort implements SortUtil.Sort{ e6sL N
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/* (non-Javadoc) CG=#rc]vz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) eqeVz`
*/ `*}#Bks!
public void sort(int[] data) { )KXLL;]
quickSort(data,0,data.length-1); +]uy
} !G\1$"T$
private void quickSort(int[] data,int i,int j){ 8"oS1W
int pivotIndex=(i+j)/2; {:6VJ0s\
//swap Vy}:Q[
SortUtil.swap(data,pivotIndex,j); w/YKWv{_S
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int k=partition(data,i-1,j,data[j]); bXJ,L$q
SortUtil.swap(data,k,j); C!qW:H
if((k-i)>1) quickSort(data,i,k-1); eDaVoc3
if((j-k)>1) quickSort(data,k+1,j); akd~Z
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} v#-%_V>ph
/** Ao{wd1
* @param data U?#6I-
* @param i 0>Mm |x*5
* @param j QREIr |q'
* @return 6K`frt
*/ 7acAU{Rr
private int partition(int[] data, int l, int r,int pivot) { 7t@jj%F
do{ mXhr: e
while(data[++l] while((r!=0)&&data[--r]>pivot); E8%O+x}
SortUtil.swap(data,l,r); +"'h?7'C
} ,j&o H$mW
while(l SortUtil.swap(data,l,r); zw5EaY
return l; (6 0,0|s
} q".l:T%|C}
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改进后的快速排序: 1ed#nB%
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package org.rut.util.algorithm.support; F!fxA#
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import org.rut.util.algorithm.SortUtil; b?w4Nx#
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/** >{m>&u;Cc
* @author treeroot 0Fbq/63
* @since 2006-2-2 /eIwv31
* @version 1.0 l l&iMj]
*/ WU=Os8gR
public class ImprovedQuickSort implements SortUtil.Sort { h!d#=.R
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private static int MAX_STACK_SIZE=4096; 0CTI=<;
private static int THRESHOLD=10; DCwldkdJN
/* (non-Javadoc) VaX>tUW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u=ENf1{ $>
*/ o
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public void sort(int[] data) { ty-4yK#
int[] stack=new int[MAX_STACK_SIZE]; [fO]oTh
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int top=-1; =q6yb@
int pivot; |W#^L`!G
int pivotIndex,l,r; Bb-x1{t
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stack[++top]=0; Xc
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stack[++top]=data.length-1; k)S7SbQ
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while(top>0){ ss,6;wfX
int j=stack[top--]; .bpxSU%X
int i=stack[top--]; jriliEz;f
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pivotIndex=(i+j)/2; Q%t8cJL
pivot=data[pivotIndex]; ;|
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SortUtil.swap(data,pivotIndex,j); [dt1%DD`M
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//partition y# x]?%m
l=i-1; Dm4\Rld{
r=j; 8dL(cC
do{ 9KAXc(-
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ^[qmELW#7
SortUtil.swap(data,l,r); OM,uR3,
} gVZ~OcB!W
while(l SortUtil.swap(data,l,r); NEJ
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SortUtil.swap(data,l,j); ^-=,q.[7
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if((l-i)>THRESHOLD){ Rjh/M`|
stack[++top]=i; t%8*$"~X
stack[++top]=l-1; N'[^n,\(:
} =&}dP%3LC)
if((j-l)>THRESHOLD){ "I+wU`AIek
stack[++top]=l+1; yYF80mnJz
stack[++top]=j; ;PLby]=O
} -ud!j
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} 2+ 9">a@
//new InsertSort().sort(data); *,Y+3yM
insertSort(data); F'`L~!F
}
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/** L0uN|?}
* @param data BJ{mX>I(
*/ N %0F[sY6
private void insertSort(int[] data) { le8n!Dk(
int temp; \W*ouH
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); (c[|k
} 5?2PUE,a
} eqjl$QWPJS
} r!#a.
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} UHR)]5Lt
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