归并排序: a
@i?E0Fr
9YVr9BM'K
package org.rut.util.algorithm.support; ku^0bq}BrH
a~A"uLBR
import org.rut.util.algorithm.SortUtil; ~NZ}@J{00_
_GsHT\
/** y7-daek
* @author treeroot A"Sp7M[J
* @since 2006-2-2 Oi$$vjs2
* @version 1.0 ea6`%,lF~
*/ T~)zgu%q_
public class MergeSort implements SortUtil.Sort{ VNHt ]Ewj
6;p"xC-
/* (non-Javadoc) U~_G *0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UjcKvF
*/ 9}#9i^%}
public void sort(int[] data) { .y2np
int[] temp=new int[data.length]; eGi|S'L'
mergeSort(data,temp,0,data.length-1); &D#B"XI
} jOU1F1
v.{I^=
private void mergeSort(int[] data,int[] temp,int l,int r){ F?hGt]o
int mid=(l+r)/2; *%jd>e7d
if(l==r) return ; @h)X3X
mergeSort(data,temp,l,mid); TM0DR'.
mergeSort(data,temp,mid+1,r); Rkh
^|_<!
for(int i=l;i<=r;i++){ p^U#1c
temp=data; 7&*d]#&~j
} S@6 :H"
int i1=l; ^s6C']q *O
int i2=mid+1; [J+]1hCZ|
for(int cur=l;cur<=r;cur++){ jU_#-<'r
if(i1==mid+1) aKk0kC
data[cur]=temp[i2++]; }(v <f*7=n
else if(i2>r) 28=L9q
data[cur]=temp[i1++]; Rv@(
[rn+
else if(temp[i1] data[cur]=temp[i1++]; GL'zNQP-
else C.Re*;EI,
data[cur]=temp[i2++]; 8e}8@[h
} 5gbD|^ij
} A\T9>z^k
zJT,Hv .
} k{ibD5B
Z$2Vd`XP
改进后的归并排序: THHA~;00YN
xqLIs:*
package org.rut.util.algorithm.support; 8I%N^G
-`d(>ok
import org.rut.util.algorithm.SortUtil; sZYTpZgW4L
jWJ/gv~ $
/** Y"'k $jS-
* @author treeroot #Q$`3rr
* @since 2006-2-2 NK|m7(
* @version 1.0 ~R\U1XXyUY
*/ 4!0nM|~
public class ImprovedMergeSort implements SortUtil.Sort { O:Ob{k
egy#8U)Z
private static final int THRESHOLD = 10; R4Si{J*O
eVB.g@%T
/* _~_6qTv-d
* (non-Javadoc) 2W q/_:
* b%M|R%)]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q<!KtI4
*/ &{(8EvuDd
public void sort(int[] data) { <nE |Y@S
int[] temp=new int[data.length]; "RM vWuNt
mergeSort(data,temp,0,data.length-1); 3-$w5O3}
} X]AbBzy
AlQ
private void mergeSort(int[] data, int[] temp, int l, int r) { N6*v!M+
int i, j, k; ]#Q'~X W
int mid = (l + r) / 2; @iD5X.c
if (l == r) wO3K2I]>0
return; TLiA>`r=
if ((mid - l) >= THRESHOLD) V0'_PR@;
mergeSort(data, temp, l, mid); AC9#!#
OGB
else ;
#^Jy#)
insertSort(data, l, mid - l + 1); +jpC%o}C
if ((r - mid) > THRESHOLD) 'c|Y*2@
mergeSort(data, temp, mid + 1, r); 0&|,HK
else {glRXR
insertSort(data, mid + 1, r - mid); =| M[JPr
bLpGrGJs
for (i = l; i <= mid; i++) { PM!7ci
temp = data; lg!{?xM
} 4*aNdh[t.
for (j = 1; j <= r - mid; j++) { 4Iou|
H
temp[r - j + 1] = data[j + mid]; ~'2im[f J
} $>mTPNF
int a = temp[l]; ;Z(~;D
int b = temp[r]; x#s=eeP1
for (i = l, j = r, k = l; k <= r; k++) { (6Sf#M
if (a < b) { .+TriPL
data[k] = temp[i++]; MOEB{~v`;
a = temp; B[rxV
} else { 4$<-3IP,
data[k] = temp[j--]; CF k^(V"
b = temp[j]; qg;fh]j%
} Y8yRQz u
} n\Y|0\ B
} wf8GH}2A
'hM?J*m
/** >@o}l:*
* @param data \PB ~6
* @param l e!(0y)*
* @param i Ck0R%|
*/ &i~AXNw
private void insertSort(int[] data, int start, int len) {
*R6n+d
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
iEf6oM
} wGC)gW
} y`EcBf
} hp E?
buhn~ c
}