gRHtgR)T3
*K`x;r
快速排序: (m6EQoW^s+
^#2xQ5h
package org.rut.util.algorithm.support; Umij!=GPG^
nZ~kZ |VS
import org.rut.util.algorithm.SortUtil; </,.K`''W
cxgE\4_u"
/** 1^S'sWwe
* @author treeroot
l@xWQj9
* @since 2006-2-2 =`JW1dM
* @version 1.0 cbfDB^_
*/ ;;M"hI3@
public class QuickSort implements SortUtil.Sort{ ]7*kWc2
;3mL^
/* (non-Javadoc) Is
ot4HLM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ha?G=X
*/ lHcA j{6
public void sort(int[] data) { C(}^fJ6r
quickSort(data,0,data.length-1); JT}.F!q6E
} xg?auje
private void quickSort(int[] data,int i,int j){ }*h47t}
int pivotIndex=(i+j)/2; V- /YNRV
//swap kY=rz&?U
SortUtil.swap(data,pivotIndex,j); }4Zkf<#7$
f`,-b
int k=partition(data,i-1,j,data[j]); 5lGQ#r
SortUtil.swap(data,k,j); 7"#f!.E
if((k-i)>1) quickSort(data,i,k-1); d)\2U{
if((j-k)>1) quickSort(data,k+1,j); |88CBiu}
uj)yk*
} dbCNhbN(
/** 55^tfu
* @param data W8y$Ve8m
* @param i z4bN)W )p
* @param j dIvy!d2l
* @return .8K6C]gw
*/ B@"J]S
private int partition(int[] data, int l, int r,int pivot) { )J&|\m(e
do{ F.68iN}
while(data[++l] while((r!=0)&&data[--r]>pivot); ZvH?3Jy
SortUtil.swap(data,l,r); ^,`M0g\$
} S#mK
Pi+3
while(l SortUtil.swap(data,l,r);
f\ 'T_
return l; S"Kq^DN
} f9a$$nb3`
>otJF3zw
} 7LfcF
iKhH ^V%j
改进后的快速排序: *Z; r
B
HAd%k$Xu{
package org.rut.util.algorithm.support; `UQEXoB)
XC2FF&B&
import org.rut.util.algorithm.SortUtil; ,m:L2 -J@
Ch t%uzb,
/** b4)k &*dfR
* @author treeroot O:._W<
* @since 2006-2-2 2$tQ @r
* @version 1.0 yyjw?#\8
*/ |kseKZ3
public class ImprovedQuickSort implements SortUtil.Sort { *,&S' ,S-
9n"V\e_R
private static int MAX_STACK_SIZE=4096; Kr]z]4.d@
private static int THRESHOLD=10; kutJd{68
/* (non-Javadoc) /kRAt^4!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^&NN]?
*/ e8-ehs>
public void sort(int[] data) { T<6GcI>A
int[] stack=new int[MAX_STACK_SIZE]; l#$TYJi
NV6G.x
int top=-1; _4v"")Xe
int pivot; !VRo*[yD@
int pivotIndex,l,r; TM-Fu([LMV
jM @?<1
stack[++top]=0; XhN{S]Wn
stack[++top]=data.length-1; U<rI!!#9
Pj&A=
while(top>0){ IJ_ m
int j=stack[top--]; $''UlWK
int i=stack[top--]; 1x{kl01m%
_C$X04bU3V
pivotIndex=(i+j)/2; XXm'6xD-
pivot=data[pivotIndex]; bcn7,ht
bb1f/C%
SortUtil.swap(data,pivotIndex,j); 7]Rk+q2:
|z*>ixK
//partition #x)8f3I
l=i-1; 6@YH#{~Zpv
r=j; zSXA=
do{ 7 >bMzdH
while(data[++l] while((r!=0)&&(data[--r]>pivot)); $w/E9EJ)3A
SortUtil.swap(data,l,r); mX;H((
} R$d7\nBG
while(l SortUtil.swap(data,l,r); 1qZG`Vz
SortUtil.swap(data,l,j); NO4Z"3Pd_
O:YJ%;w
if((l-i)>THRESHOLD){ ZLrHZhP-+
stack[++top]=i; GW/WUzK
stack[++top]=l-1; r]T0+ oQ>
} T,OS 0;7O
if((j-l)>THRESHOLD){ !^?qU;|
stack[++top]=l+1; \z:<DsQ&
stack[++top]=j; CN\=9Rvs
} =$&&[&
D5L{T+}Oi%
} i*CnoQH
//new InsertSort().sort(data); 5\'AD^{
insertSort(data); d.AC%&W
} esI'"hVJ
/** Ww`&i
* @param data (f>M &..
*/ eGvOA\y:
private void insertSort(int[] data) { :tbd,Uo
int temp; 2(+P[( N1,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); FM\[].
} X~L!e}Rz
} ~OCZz$qA
} Z&Pu8zG
/m
lDN?|YG
} z_n\5.
D/:3RZF