OT{cP3;0*o
B
EB[K2[9
快速排序: Uon^z?0A
@K=C`N_22
package org.rut.util.algorithm.support; y0_z_S#gO
#$0*Gd-N
import org.rut.util.algorithm.SortUtil; SA[wFc
j;SK{Oq
/** BH\!yxK
* @author treeroot <<l1zEf@
* @since 2006-2-2 ,zVS}!jRhy
* @version 1.0 )
o`ep{<t
*/ &UfP8GE9
public class QuickSort implements SortUtil.Sort{ d.Ep#4
PB(I3R9
/* (non-Javadoc) )wyC8` &-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8$`$24Wx
*/ 5/YGu=,
public void sort(int[] data) { 4U>g0
quickSort(data,0,data.length-1); DrA\-G_7
} |e{ ^Yf4
private void quickSort(int[] data,int i,int j){ 7 F> a&r
int pivotIndex=(i+j)/2;
34<k)0sO
//swap ^ DCBL&I
SortUtil.swap(data,pivotIndex,j); pPsT,i?
xVN(It7g
int k=partition(data,i-1,j,data[j]); R1vuf*A5,
SortUtil.swap(data,k,j); .oH)eD
if((k-i)>1) quickSort(data,i,k-1); AjD?_DPc
if((j-k)>1) quickSort(data,k+1,j); u5N&W n{
+;/ s0
} _qa9wK/
/** 9 iV_
* @param data .H
9r_
* @param i +$$5Cv5#<&
* @param j (lg~}Jwq
* @return J_ 7#UjGA,
*/ )~-r&Q5d
private int partition(int[] data, int l, int r,int pivot) { T^Ol=QCu
do{ {uN-bl?o
while(data[++l] while((r!=0)&&data[--r]>pivot); 46U*70
SortUtil.swap(data,l,r); Y1G/1Z# 2
} IoZ_zz0
while(l SortUtil.swap(data,l,r); lk.Mc6)
return l; p|g7Z
} KAg-M#
,H>'1~q
} `Wd4d2aLG
zZ 94_8b
改进后的快速排序: C#n.hgo>I
L)c]i'WZ
package org.rut.util.algorithm.support; jo'
V.]\
VS3lz?o?6g
import org.rut.util.algorithm.SortUtil; [>KnMi=o)
-"rANP-UI
/** u#UtPF7q
* @author treeroot p<+Y;,+
* @since 2006-2-2 g@Pq<
* @version 1.0 P*n/qj8h
*/ 5mX^{V&^
public class ImprovedQuickSort implements SortUtil.Sort { 8[;AFm ?,`
4~Y?*|G]m
private static int MAX_STACK_SIZE=4096; D$+g5u)
private static int THRESHOLD=10; Nw{Cu+AwG
/* (non-Javadoc) tz5\O}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0g9y4z{H
*/ UF$O@l
public void sort(int[] data) { Xl:.`{5L
int[] stack=new int[MAX_STACK_SIZE]; :D4'x{#H
Tp|>(~;ai
int top=-1; PS8^=
int pivot; ^*w}+tB
int pivotIndex,l,r; gJ~CD1`O
|w+
O.%=
stack[++top]=0; ?aI.Z+#
stack[++top]=data.length-1; uPxJwWXO
%|j8#09
while(top>0){ `"o{MaFA
int j=stack[top--]; B#?rW*yEe
int i=stack[top--]; D8{,}@
6AoKuT;
pivotIndex=(i+j)/2; U9K'O !i>
pivot=data[pivotIndex]; mZG n:f}=
U1(cBY
SortUtil.swap(data,pivotIndex,j); T0~~0G)k
GS7'pTsYH
//partition M|Nh(kvH
l=i-1; i[ >U#5
r=j; TY%=Y=
do{ mZM,"Wq,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *Q)-"]O(k
SortUtil.swap(data,l,r); %~} ,N
} )+DDIq
while(l SortUtil.swap(data,l,r); CO9PQ`9+
SortUtil.swap(data,l,j); 7t1as.
|KY-kRN7
if((l-i)>THRESHOLD){ #kh:GAp]
stack[++top]=i; D/JSIDd
stack[++top]=l-1; <EQaYZY=
} A7,%'.k
if((j-l)>THRESHOLD){ gwdAf%|f
stack[++top]=l+1; q"6$#o{~U
stack[++top]=j; _RUL$Ds
} K&RIF]0#G
/.=aA~|
} 5Zd oem
//new InsertSort().sort(data); o"FR%%
insertSort(data); cTS.yN({G
} em5~4;&'
/** Bs` {qmbC
* @param data -FI)o`AE
*/ Tl'wA^~H
private void insertSort(int[] data) { ?{jey_]M
int temp; v+[S${
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); %P M#gnt@
} D[?;+g/
} W G@3+R>{
} ExSM=
Z^z{,
u;!
} 7(uz*~Z?`0
y.}{KQ"a*