归并排序: -qfnUh
Z B$NVY
package org.rut.util.algorithm.support; xdqK.Z%
nn'Af,ko/
import org.rut.util.algorithm.SortUtil; bf(+ldq
a5)JkC
/** V,m3-=q
* @author treeroot [8TS"ph>
* @since 2006-2-2 n_}aZB3;U
* @version 1.0 }qL~KA{&
*/ me:iQ.g
public class MergeSort implements SortUtil.Sort{ G%$}WA]|
WI{ ;#A
/* (non-Javadoc) oBC]UL;8xJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6^ab@GrN\
*/ {pC\\}
public void sort(int[] data) { &Q~)]|t
int[] temp=new int[data.length]; 5#2jq<D
mergeSort(data,temp,0,data.length-1); .zIgbv s
} Hr&Ere8.4p
f7
wmw2
private void mergeSort(int[] data,int[] temp,int l,int r){ ']h
IfOD"r
int mid=(l+r)/2; TA| s@T{
if(l==r) return ; c})wD+1
mergeSort(data,temp,l,mid); 03Ukw/D&
mergeSort(data,temp,mid+1,r); 8gAu7\p}
for(int i=l;i<=r;i++){ mqw 84u
temp=data; tH,sql)
} pZjpc#*9N
int i1=l; 8jNOEM(0Y+
int i2=mid+1; w&5/Zh[~~L
for(int cur=l;cur<=r;cur++){ Bq;1^gtpe
if(i1==mid+1) MnS+ nH!d
data[cur]=temp[i2++]; >:$"a
else if(i2>r) r>O|L%xpv
data[cur]=temp[i1++]; >4c` UW
else if(temp[i1] data[cur]=temp[i1++]; tpGCrn2w>
else ]=Pu\eE
data[cur]=temp[i2++]; %/!+(7
D
} O"iak
} 7"a4/e;^
}uiPvO+&p
} QtlT&|$
0qR$J
改进后的归并排序: f"P$f8$
Yt*vqm[WV
package org.rut.util.algorithm.support; LQ>$>A(
~of,,&
import org.rut.util.algorithm.SortUtil; .
pP7"E4]
5*+I
M*c
/** g}Mi9Kp
* @author treeroot Ld~ q1*7J
* @since 2006-2-2 ju.OW`GM
* @version 1.0 B\0t&dai|'
*/ b5S7{"<V
public class ImprovedMergeSort implements SortUtil.Sort { ,J&9kYz
u(Rk'7k
private static final int THRESHOLD = 10; yW`e |!
gwq`_/d}
/* .<.#aY;N
* (non-Javadoc) HU9p!I.
* ,5.
<oDH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U{HML|
*/ %"+4
D,'l
public void sort(int[] data) { F|*tNJU>
int[] temp=new int[data.length]; (!-;T
mergeSort(data,temp,0,data.length-1); ~j]dct7
} y@aKNWy}$
&=NJ
private void mergeSort(int[] data, int[] temp, int l, int r) { ZRPy~wy>
int i, j, k; BfVBywty
int mid = (l + r) / 2; sZwZWD'
if (l == r) 70=(.[^+
return; fp tIc#4
if ((mid - l) >= THRESHOLD) `-u7 I
mergeSort(data, temp, l, mid); tUv3jq)n%
else 'e85s%ru
insertSort(data, l, mid - l + 1); 6Hl<,(vn
if ((r - mid) > THRESHOLD) v8
mergeSort(data, temp, mid + 1, r); #<]Iz'\`
else vnZ4(
insertSort(data, mid + 1, r - mid); C]Q>*=r
3sb 5E]P
for (i = l; i <= mid; i++) { B\/7^{i5
temp = data; fyrd`R
} -f 4>MG
for (j = 1; j <= r - mid; j++) { DyIV/
temp[r - j + 1] = data[j + mid]; L20rv:W$h
} %",ULtZ+
int a = temp[l]; q}sK
int b = temp[r]; }_]As}E
for (i = l, j = r, k = l; k <= r; k++) { gwJ}]Tf
if (a < b) { z'*ml ?
data[k] = temp[i++]; 2m_H*1HJ
a = temp; "f<#.}8
} else { t2U$m'(A&
data[k] = temp[j--]; :Fnzi0b
b = temp[j]; T\fudmj&
} :l;,m}#@
} K.%z;(U
} qsTq*G
JSRg?p\
/** F^xaz^=`u
* @param data H4 =IY
* @param l l@#b;M/
* @param i %UBPoq
*/ ,8~dz
private void insertSort(int[] data, int start, int len) { [NjajA~z>F
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); %]!?{U\*k
} H(?e&Qkg
} %;
qY'+
} soDfi-2o3
?`"<DH~:0B
}