归并排序: gYKz,$
d ]P~
package org.rut.util.algorithm.support; &k}f"TX2
v,KKn\X
import org.rut.util.algorithm.SortUtil; AJPvwu}D
;P@]7vkff
/** m#7(<#
* @author treeroot >Fel) a
* @since 2006-2-2 </h^%mnd
* @version 1.0 >L7s[vKn
*/ ^J'_CA
public class MergeSort implements SortUtil.Sort{ / ;]5X
8H!QekQZ]\
/* (non-Javadoc) rpR${%jc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }#XFa#
*/ ,WT>"9+
public void sort(int[] data) { }Z!D?(
int[] temp=new int[data.length]; %q {q.(M#
mergeSort(data,temp,0,data.length-1); E[H
} FKa";f"
Z~5) )5Ye;
private void mergeSort(int[] data,int[] temp,int l,int r){ ,^(]zZh
int mid=(l+r)/2; k:@DK9
"^
if(l==r) return ; +a1x;
mergeSort(data,temp,l,mid); #~ u0R>=
mergeSort(data,temp,mid+1,r); LFp "Waiv
for(int i=l;i<=r;i++){ +{J8,^z#
temp=data; )-C3z
} 0'QWa{dS\
int i1=l; IrLGAQ0
int i2=mid+1; qL(Q1O!
for(int cur=l;cur<=r;cur++){ [ERZ".?
if(i1==mid+1) zZ5:)YiW-
data[cur]=temp[i2++]; ep0,4!#FAO
else if(i2>r) hp\&g2_S0W
data[cur]=temp[i1++]; NxT"A)u
else if(temp[i1] data[cur]=temp[i1++]; }U_
'7_JT
else :{lwz#9V
data[cur]=temp[i2++]; JfY*#({y
} ZCiCZ)oc
} \8`?ir
q"
<xOv8IQ|
} wQkM:=t5
+.G"ool
改进后的归并排序: s{hKl0ds
UO/sv2CN
package org.rut.util.algorithm.support; :+rGBkw1m
7s9h:/Lu
import org.rut.util.algorithm.SortUtil; wj|Zn+{"nF
,"(L2+Yp
/** ]Bw0Qq F#
* @author treeroot sDY~jP[Oa
* @since 2006-2-2 IK~&`n](>
* @version 1.0 [6/QUD8
*/ \mqx '
public class ImprovedMergeSort implements SortUtil.Sort { M6Fo.eeK3
Q?{%c[s
private static final int THRESHOLD = 10; XYE|=Tr]
x0*{oP
/* M `xiC
* (non-Javadoc) gv#\}/->4
* Y+gY"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _T=g?0
q
*/ VFHd2Ea(
public void sort(int[] data) { LF<&gC
int[] temp=new int[data.length]; ,Kit@`P%
mergeSort(data,temp,0,data.length-1); 8`Ya7c>
} cNs'GfD}
!3v&+Jrf6
private void mergeSort(int[] data, int[] temp, int l, int r) { (~T*yH ~
int i, j, k; H=t"qEp
int mid = (l + r) / 2; 2iAC_"n
if (l == r) 5E:$\z;
return; 5of3&
if ((mid - l) >= THRESHOLD) zM0NRERi
mergeSort(data, temp, l, mid); =W(*0"RM
else B5e9'X^
[
insertSort(data, l, mid - l + 1); sE1cvAw9l
if ((r - mid) > THRESHOLD) 4ls:BO;k]
mergeSort(data, temp, mid + 1, r); Ic&h8vSU
else G=dzP}B'WA
insertSort(data, mid + 1, r - mid); $Y$9]G":
0}{xH
for (i = l; i <= mid; i++) { NE995;
temp = data; M>Q]{/V7T
} lOIk$"Ne
for (j = 1; j <= r - mid; j++) { >4 OXG7.&f
temp[r - j + 1] = data[j + mid]; md!6@)S-p
} 1GY2aZ@
int a = temp[l]; V5|ANt
int b = temp[r]; [U\?+@E*
for (i = l, j = r, k = l; k <= r; k++) { |s| }u`(@9
if (a < b) { s6H'}[E<
data[k] = temp[i++]; 95DEuReKi
a = temp; ZedFhm
} else { 8HF^^Cva
data[k] = temp[j--]; xU
*:a[g
b = temp[j]; ! -gU~0
} ,Q`qnn&
} K*6 "c.D
} So:X!ljN(e
_IH" SVub
/** rg/{5f
* @param data
%H{p&ms
* @param l |HazM9=
* @param i ^0VL](bD>
*/ ?KT{H(rU
private void insertSort(int[] data, int start, int len) { R1jl <=
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); pYO =pL^Q
} }d$-:l,w
} L`NIYH<^
} ?Ua,ba*
VYyija:
}