归并排序: o=q
N+-N
C.%iQx`
package org.rut.util.algorithm.support; W(~G^Xu
tojJQ6;J
import org.rut.util.algorithm.SortUtil; L.l"'=M
V<:kS
/** Vu^J'>X
* @author treeroot jEit^5^5|
* @since 2006-2-2 4-ZiKM
* @version 1.0 f*2V
*/
|cWW5\/
public class MergeSort implements SortUtil.Sort{ AG/nX?u7)t
l
\xIGs
/* (non-Javadoc) [-s0'z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rTDx|pvYx
*/ &zb_8y,
public void sort(int[] data) { kxThtjgv
int[] temp=new int[data.length]; wf6ZzG:
mergeSort(data,temp,0,data.length-1); 9 n|H%AC
} xqmJPbA
EG7ki0
private void mergeSort(int[] data,int[] temp,int l,int r){ y 9/27yWB
int mid=(l+r)/2; k-b_
<Tbo|
if(l==r) return ; q<,?:g$k
mergeSort(data,temp,l,mid); Fr/8q:m&
mergeSort(data,temp,mid+1,r); IDdhBdQ
for(int i=l;i<=r;i++){ s-*8=
temp=data; YPf&y"E&H
} H]}Iw5Z
int i1=l; 8
6?D
int i2=mid+1; )
;-AT^
for(int cur=l;cur<=r;cur++){ xyBe*,u
if(i1==mid+1) O0WzDD
data[cur]=temp[i2++]; &nZ=w#_
else if(i2>r) F 3,hx
data[cur]=temp[i1++]; {LR?#.
else if(temp[i1] data[cur]=temp[i1++]; L
a0H
else NZi5rXN
data[cur]=temp[i2++]; ]*sXISg1
} sJt&`k Z
} 31Zl"-<#-
+%UXI$v
} -t:yy:4
JAmv 7GL'6
改进后的归并排序: 7{."Y@
>6r&VZu*n
package org.rut.util.algorithm.support; W*`2lf
P[#V{%f*5
import org.rut.util.algorithm.SortUtil; ]Ny. gu
x4.-7%VV%
/** wEKm3mY;
* @author treeroot qJ5Y}/r
* @since 2006-2-2 Uu
}ai."iB
* @version 1.0 ~WR6rc
*/ } Yjic4?
public class ImprovedMergeSort implements SortUtil.Sort { 'ZTE"KT
.~ZNlI {K
private static final int THRESHOLD = 10; aR*z5p2-w
G80d!*7
/* Ax=Rb
B"
* (non-Javadoc) 4K[U*-\"
* l: 1Zq_?v;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,)S|%tDW
*/ \W??`?Idh
public void sort(int[] data) { {hZ_f3o
int[] temp=new int[data.length]; M2my>
mergeSort(data,temp,0,data.length-1); FyZw='D
} s-o0N{b?#'
Maf!,/U4
private void mergeSort(int[] data, int[] temp, int l, int r) { pYceMZ$
int i, j, k; v(h
int mid = (l + r) / 2; E"pq ZP =
if (l == r) _d %H;<_
return; nCGLuZn
if ((mid - l) >= THRESHOLD) Le|Ho^h,Y
mergeSort(data, temp, l, mid); ;u!>( QQ
else (!W:-|[K\
insertSort(data, l, mid - l + 1); Co[ rhs
if ((r - mid) > THRESHOLD) B07(15y]
mergeSort(data, temp, mid + 1, r); gqyQ Zew
else iNd8M V
insertSort(data, mid + 1, r - mid); }yx'U 3
]{.rx),
for (i = l; i <= mid; i++) { TP'EdzAT
temp = data; cDm_QYQ
} ;}=v|Dr&I.
for (j = 1; j <= r - mid; j++) { A4Q8^^byY
temp[r - j + 1] = data[j + mid]; **fJAANc
} 1ncY"S/VO
int a = temp[l]; % ]r@vjeyd
int b = temp[r]; 6$9n_AS
for (i = l, j = r, k = l; k <= r; k++) { oizD:|
if (a < b) { FTtYzKX(bv
data[k] = temp[i++]; iW.8+?Xq&
a = temp; #N[nvIi}
} else { ZK{VQ~
data[k] = temp[j--]; ;W'y^jp]"
b = temp[j]; B~jl1g|
} l?pZdAE
} ,DXNq`24
} cqRIi~`
&N[~+"
/** 2}b1PMpZG
* @param data %RdCSQ9~
* @param l -9.S?N'T>;
* @param i V78QV3
*/ O}Fp\"
private void insertSort(int[] data, int start, int len) { TL1pv l
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); '7u#uL,pa1
} [ -{L@
} 4g$mz:vo
} h=EJNz>U
aq oT
}