t8B==%
A
w)P%r
快速排序: "0 {t~?ol
T0BM:ofx
package org.rut.util.algorithm.support; W4=<hB
7;NvR4P%
import org.rut.util.algorithm.SortUtil; B3yp2tncj
+w+qTZyky
/** xcN
>L
* @author treeroot ]dHV^!
* @since 2006-2-2 Mh5 =]O+
* @version 1.0 xJ)vfo
*/ R1\$}ep^
public class QuickSort implements SortUtil.Sort{ ETq~,g'
-42jeJS
/* (non-Javadoc) ?N@p~
*x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sme!!+Rd
*/ |I=\+P}s
public void sort(int[] data) { QfsTUAfR
quickSort(data,0,data.length-1); WAp#[mW.fx
} G1:2MPH
private void quickSort(int[] data,int i,int j){ Qrt> vOUE7
int pivotIndex=(i+j)/2; wvNddu>@
//swap ceGo:Aa<)
SortUtil.swap(data,pivotIndex,j); .{LJ
I)F3sS45}
int k=partition(data,i-1,j,data[j]); #zc{N"!
SortUtil.swap(data,k,j); j?P8&Fm<
if((k-i)>1) quickSort(data,i,k-1); Zkn1@a
if((j-k)>1) quickSort(data,k+1,j); >-YWq
3}X; WE `
} "e~"-B7(\Y
/** ZYD3[" ~x
* @param data Y7
`i~K;
* @param i 9oJ=:E~CP
* @param j U/bQ(,3}
* @return _sp/RU,J-3
*/ s1NRUV2E
private int partition(int[] data, int l, int r,int pivot) { :1\QM'O
do{ WjvD C"
while(data[++l] while((r!=0)&&data[--r]>pivot); gDjs:]/YR
SortUtil.swap(data,l,r); XxEKv=_bc
} LVp*YOq7
while(l SortUtil.swap(data,l,r); ]Vgl
return l; do(komP<\
} \~bE|jWbj
'1yy&QUZq
} (@1*-4l
hh>mX6A
改进后的快速排序: ckPI^0A!
f ")*I
package org.rut.util.algorithm.support; J|2OmbJ e
QGV~Y+
import org.rut.util.algorithm.SortUtil; ?$LKn2C
b_T?jCyW
/** fd Rw:K8
* @author treeroot G'
'l,\3
* @since 2006-2-2 h_:|H8t;w
* @version 1.0 1V37%
D
*/ V_"K
public class ImprovedQuickSort implements SortUtil.Sort { ?H_'L4Wv
0qrsf!
private static int MAX_STACK_SIZE=4096; 7I_lTu(
private static int THRESHOLD=10; 79 ZBVe(}
/* (non-Javadoc) -O-qEQd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xl~%hwBd
*/ S<V__Sv
public void sort(int[] data) { P ME
?{%&
int[] stack=new int[MAX_STACK_SIZE]; 0cm+:
\#; -C<[b
int top=-1; (S["
ak
int pivot; '9MtIcNb
int pivotIndex,l,r; ,pz^8NJAI
<H)I06];
stack[++top]=0; x\Det$3Kx
stack[++top]=data.length-1; r{gJ[%
4(f4 4' ^
while(top>0){ |Skk1#
int j=stack[top--]; 9ZEF%&58Y
int i=stack[top--]; //}[(9b'\
/U#{6zeM[,
pivotIndex=(i+j)/2; JS<4%@
pivot=data[pivotIndex]; d= -/'_'
$6XCHVx
SortUtil.swap(data,pivotIndex,j); N3Jfp3_b@
zp2IpYQ,3
//partition IP` ;hC
l=i-1; %:eepG|
r=j; |*im$[g=-
do{ 5Q.bwl :
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ^rc!X]C9
SortUtil.swap(data,l,r); !v2D 18(
} q.OkZI0n
while(l SortUtil.swap(data,l,r); Et=N`k_gO
SortUtil.swap(data,l,j); FSqS]6b3
.`OdnLGy
if((l-i)>THRESHOLD){ I
=t{ u;
stack[++top]=i; Zq--m/
stack[++top]=l-1; Ny>tJ~I
} Gv!*
Qk4
if((j-l)>THRESHOLD){ ~5HI9A4^
stack[++top]=l+1; `R]9+_"N
stack[++top]=j; s wdW70
} u $N2uFc
#KonVM(`
} f.`noZN
//new InsertSort().sort(data); -O2ZrJ!q
insertSort(data); CqUK[#kW(
} a(X?N.w
/** p
AzPi
* @param data ;2vHdN
*/
?6!7fs,
private void insertSort(int[] data) { .pgTp X
int temp; )jK"\'cK
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 38dXfl
} dFF [2
} ? {Lp
} &Z_W*D
W^W^5-'"D,
} J 3fcnI
'Pudy\Ab