归并排序: T!^Mvat
A3UQJ
package org.rut.util.algorithm.support; l8wF0|
S ~|.&0"\
import org.rut.util.algorithm.SortUtil; mvTb~)
F,}s$v
/** gbGTG(:1S
* @author treeroot |O (G nsZ
* @since 2006-2-2 xb^Mo.\[
* @version 1.0 } p'8w\C$
*/ =7jEz+w#
public class MergeSort implements SortUtil.Sort{ m6n hC
X%4h(7;v
/* (non-Javadoc) !Yh}H<w0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) b7$}JCn
*/ m^tNqJs8
public void sort(int[] data) { :,F=w0O
int[] temp=new int[data.length]; 0=[0|`x
mergeSort(data,temp,0,data.length-1); Y6eEGo"K.+
} S<oQ}+4[~
iHz[Zw^.s
private void mergeSort(int[] data,int[] temp,int l,int r){ @>O&Cpt
int mid=(l+r)/2; v]bAWo
if(l==r) return ; f=ib9WbR#
mergeSort(data,temp,l,mid); -9G]x{>
mergeSort(data,temp,mid+1,r); &5q{viI
for(int i=l;i<=r;i++){ p.Y$A
if.
temp=data; 7%CIt?Z%
} `"Dy%&U
int i1=l; Ak=UtDN[
int i2=mid+1;
5-'vB
for(int cur=l;cur<=r;cur++){ L>nO:`>h
if(i1==mid+1) .cR*P<3O
data[cur]=temp[i2++]; 60PYCqWc
else if(i2>r) BX$hAQ(6Q
data[cur]=temp[i1++]; `Cj,HI_/*
else if(temp[i1] data[cur]=temp[i1++]; `^%GN8d}nm
else "6V_/u5M;=
data[cur]=temp[i2++]; hEOJb
@:R
} E^syrEz
} Ekf2NT
;D&wh
} M[,^KJ!
~&~C#yjg1
改进后的归并排序: FOp_[rR
d| \#?W&
package org.rut.util.algorithm.support; {Gkn_h-^
&7F&}7*c
import org.rut.util.algorithm.SortUtil; \X opU"
7SHo%bA
/** Gg+YfY_
* @author treeroot r,nn~
* @since 2006-2-2 ,4Y sZ
* @version 1.0 1UyH0`&
*/ vs*I7<
public class ImprovedMergeSort implements SortUtil.Sort { ;U7t
)/TVJAJ
private static final int THRESHOLD = 10; AIfk"2
{G.{ad
/* 6QptKXu7
* (non-Javadoc) EG1x
* bV7QVu8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rxkBg0Z`a
*/ mt .,4
public void sort(int[] data) { }2xb&6g~o
int[] temp=new int[data.length]; ST4(|K
mergeSort(data,temp,0,data.length-1); :+A;TV
} 9jjL9f_3
nK:`e9ES
private void mergeSort(int[] data, int[] temp, int l, int r) { g{&PrE'e9
int i, j, k; m2MPWy5s
int mid = (l + r) / 2; "b;k.Fx
if (l == r) Q2R>lzB
return; ~p!QSRu~,b
if ((mid - l) >= THRESHOLD) s.ey!ew
mergeSort(data, temp, l, mid); ^ N_`^m
else [r~~=b7*[
insertSort(data, l, mid - l + 1); RA~_]Hk
if ((r - mid) > THRESHOLD) Faw. GU
mergeSort(data, temp, mid + 1, r); Q
}8C
else nTQ (JDf
insertSort(data, mid + 1, r - mid); 2c*2\93>
>,w P!;dh
for (i = l; i <= mid; i++) { qZc)Sa.S
temp = data; Ot"(uW4$[
} dK7 ^
for (j = 1; j <= r - mid; j++) { 8Nv-/VQ/b
temp[r - j + 1] = data[j + mid]; y7
<(,uT
} /^WE@r[:
int a = temp[l]; )xbqQW7%0+
int b = temp[r]; .Px,=56$X
for (i = l, j = r, k = l; k <= r; k++) { ^f"&}%" M
if (a < b) { 6P6Jx;
data[k] = temp[i++]; `}n0=E
a = temp; /3;=xZq
} else { 'jwTGT5x
data[k] = temp[j--]; F6h/0i
b = temp[j]; dR?5$V(
} s={X-H< 2
}
.;}pU!S~R
} n/:Z{
:'TX"E!
/** 5vl2yN
* @param data EID(M.G
* @param l JCBnFrP
* @param i ,9+nfj
*/ *+# k{D,
private void insertSort(int[] data, int start, int len) { ;+!xZOmm
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); sd7Y6?_C
} i@%L_[MtA
} <`b|L9
} f61]`@Bk
l$qmn$Uc
}