Q2Rj0E`
3FN? CN] O
快速排序: pkx>6(Y
vKf=t&gqr
package org.rut.util.algorithm.support; g=Di2j{A
f'dI"o&^/d
import org.rut.util.algorithm.SortUtil; Km7
$(U|JR@
/** X $f%Ss
* @author treeroot 8vK&d>
* @since 2006-2-2 E12k1gC`
* @version 1.0
2X_ef
*/ 5FxU=M1gF
public class QuickSort implements SortUtil.Sort{ >.|gmo>b
@Rm/g#!h"
/* (non-Javadoc) LNkyV*TI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "f_Z.6WMY
*/ a2TC,
public void sort(int[] data) { }T,uw8?f!
quickSort(data,0,data.length-1); CggEAi~
} O;2 u1p'iP
private void quickSort(int[] data,int i,int j){ b3+PC$z2h
int pivotIndex=(i+j)/2; 3QpTO,
//swap tS$Ne7yk e
SortUtil.swap(data,pivotIndex,j); 4KCxhJq
+Sfv.6~v
int k=partition(data,i-1,j,data[j]); e=2D^G#qE
SortUtil.swap(data,k,j); Cmj)CJ-
if((k-i)>1) quickSort(data,i,k-1); q@:&^CS
if((j-k)>1) quickSort(data,k+1,j); LxT ]-
3nO|A: t
} n>WS@b/o
/** XJ;/kR
* @param data h.*|4;
* @param i (agdgy:#
* @param j
Xc!w
y9m
* @return ;/@R{G{+~;
*/ 2olim1
private int partition(int[] data, int l, int r,int pivot) { 9[`6f8S_$
do{ I1gu<a
while(data[++l] while((r!=0)&&data[--r]>pivot); }wVrmDh \
SortUtil.swap(data,l,r); !T*izMX}
} 9=|5-?^
while(l SortUtil.swap(data,l,r); Y~R wsx
return l; =>G A_
} #^Y,,GA
q`P:PRgM
} `f'P
<mN3:G
改进后的快速排序: VZ8L9h<{"
,P}c92;
package org.rut.util.algorithm.support; L6m'u6:1{
#XsqTK_nk
import org.rut.util.algorithm.SortUtil; 9L};vkYk#
|NI0zd
/** e\<I:7%Rg
* @author treeroot ~J|0G6H
* @since 2006-2-2 V;"'!dVX
* @version 1.0 {8' 5
*/ ' vwBG=9C
public class ImprovedQuickSort implements SortUtil.Sort { 6{M.S}.^
x?3p3[y
private static int MAX_STACK_SIZE=4096; Z(L>~+%
private static int THRESHOLD=10; t.cplJF&Ue
/* (non-Javadoc) !duR7a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) EO5Vg
*/ gP3[=a"\
public void sort(int[] data) { b{&@Lm0Tn
int[] stack=new int[MAX_STACK_SIZE]; ?Rdi"{.wI
b}fH$.V@
int top=-1; +"!IVHY
int pivot; DsoF4&>g[B
int pivotIndex,l,r; x-1[2K1"[
<x/&Ml+
stack[++top]=0; ,f$RE6
stack[++top]=data.length-1; @:63OLlrG
>9 iv>
while(top>0){ KvQ9R!V
int j=stack[top--]; *b&|
int i=stack[top--]; 7%hMf$KQ
sdb#K?l
pivotIndex=(i+j)/2; g0l- n
pivot=data[pivotIndex]; 9;PtYdJ8
xRfX:3
SortUtil.swap(data,pivotIndex,j); 2h=RNU|
wNlp4Z'[
//partition fRiHs\+
l=i-1; Rh=h{O
r=j; {?8rvAjY
do{ i|t$sBIh
while(data[++l] while((r!=0)&&(data[--r]>pivot)); q45n.A6a
SortUtil.swap(data,l,r); z8oSh t`+
} 344- ~i*
while(l SortUtil.swap(data,l,r); Px<;-H`
SortUtil.swap(data,l,j); %\A~w3 E
ek9%Xk8
if((l-i)>THRESHOLD){ e.N#+
stack[++top]=i; BEw(SQH
stack[++top]=l-1; ?IK[]=!
} u URf
if((j-l)>THRESHOLD){ 8W{R&Z7aL
stack[++top]=l+1; FGC[yz1g:
stack[++top]=j; EB\\
F
} ]]+"`t,-
avQwbAh[
} R8HFyP
//new InsertSort().sort(data); +p2)uXqW
insertSort(data); .L}ar7
} WaYT\CG7y
/** `sSI; +
* @param data k]Yd4CC2
*/ E11"uWk`
private void insertSort(int[] data) { *p"%cas
int temp; %
74}H8q_z
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); k3&Wv
} ;aSEv"iWX
} K#>B'>A\
} gD-<^Q-
xu3qX"
} >6c{CYuT
#<{sP0v*