6@#=z
n7ZJ< ~wl
快速排序: ts[8;<YD
n)a/pO_
package org.rut.util.algorithm.support; _G-6G=q
_+)OL-
import org.rut.util.algorithm.SortUtil; ?$A)lWk(
pK{G2]OK{U
/** ) xV>Va8)
* @author treeroot lws.;abm%n
* @since 2006-2-2 |]q{qsy
* @version 1.0 1=+S'_j
*/ 9b-4BON{P
public class QuickSort implements SortUtil.Sort{ @fo(#i&
|,n(9Ix
/* (non-Javadoc) 1n2Pr'|s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A;ZluQ
*/ A9Ea}v9:
public void sort(int[] data) { `{w|2 [C3
quickSort(data,0,data.length-1); dwvc;f-
} 7Y.yl F:
private void quickSort(int[] data,int i,int j){ w"M!**bP
int pivotIndex=(i+j)/2; %ByqkY{5F
//swap P&c O2
SortUtil.swap(data,pivotIndex,j); Xsb.xxK.
VWXyN
int k=partition(data,i-1,j,data[j]); gQhYM7NP{5
SortUtil.swap(data,k,j); c2GTN "
if((k-i)>1) quickSort(data,i,k-1); k?3mFWc
if((j-k)>1) quickSort(data,k+1,j); qixnaiZ
th"Aatmp
} ]B&jMj~y&
/** o"N\l{ #s
* @param data Ek06=2i
* @param i +m}D.u*cp
* @param j g rQ,J
* @return 4yMi9Ri4H
*/ Mp5Z=2l5
private int partition(int[] data, int l, int r,int pivot) { Y>nQ<
do{ ?gK|R
while(data[++l] while((r!=0)&&data[--r]>pivot); :[_k .1-+
SortUtil.swap(data,l,r); -DZ5nx
} j~Ci*'*L
while(l SortUtil.swap(data,l,r); DvI^3 iG8
return l; <Z1m9O "sy
} - t4F
6I]{cm
} }ew)QHd
,*L3
改进后的快速排序: _!vuDv%
9j;!4AJ1t
package org.rut.util.algorithm.support; 4
;6,h6a
&ML-\aSal
import org.rut.util.algorithm.SortUtil; vvG*DGL)qL
Kx;l a
/** SrMfd7H8f
* @author treeroot #;P-*P
* @since 2006-2-2 L`w_Q2{sv
* @version 1.0 [4])\q^q
*/ HR'F
public class ImprovedQuickSort implements SortUtil.Sort { PGTjOkx
bI;u};v
private static int MAX_STACK_SIZE=4096; XaU^^K
private static int THRESHOLD=10; o|s|Wmx>u
/* (non-Javadoc) wUS w9xg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }&l%>P
*/ dZd]p8
public void sort(int[] data) { ?|hYtV
int[] stack=new int[MAX_STACK_SIZE]; K9RRY,JB
)DQcf]I
int top=-1; (f"LD8MJ/
int pivot; L1SZutWD?
int pivotIndex,l,r; )5diX
+
k
1q*=4O
stack[++top]=0; D|C!KF (
stack[++top]=data.length-1; +=kz".$
2-#&ktM%V
while(top>0){ b u/GaE~
int j=stack[top--]; Jjx1`S*i
int i=stack[top--]; >IS BK[=H
)RT:u)N
pivotIndex=(i+j)/2; -{*QjP;K
pivot=data[pivotIndex]; S;!7/z
6I5LZ^/ G9
SortUtil.swap(data,pivotIndex,j); NdI~1kemr
%wq;<'W
//partition `4|:8@,3{
l=i-1; ^
-lWv
r=j; .k5&C/jv
do{ S]c&