归并排序: Q f(p~a(d
|yo\R{&6
package org.rut.util.algorithm.support; V.wqZ {G
64:fs?H
import org.rut.util.algorithm.SortUtil; $%VuSrZ&
Qp`gswvE
/** g/13~UM\
* @author treeroot 5q"ON)x
* @since 2006-2-2 DWdW, xG
* @version 1.0 +l=r#JF
*/ m Z1)wH ,
public class MergeSort implements SortUtil.Sort{ %LYnxo7#C
xq"Jy=4Q*
/* (non-Javadoc) #97h6m?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Fs[aa#v4B
*/ m|OO,gR
public void sort(int[] data) { 43V}#DA@
int[] temp=new int[data.length]; 4Vq%N
mergeSort(data,temp,0,data.length-1); xeGb?DPu
} C*nB
$['Bv
private void mergeSort(int[] data,int[] temp,int l,int r){ [@4rjGwB
int mid=(l+r)/2; Ytgj|@jsp
if(l==r) return ; wj[$9UJb
mergeSort(data,temp,l,mid); 1#1 riM -
mergeSort(data,temp,mid+1,r); u+{a8=
for(int i=l;i<=r;i++){ i1RiGS
temp=data; 3P;>XGCxZ
} dK>7fy;mv
int i1=l; trE{ FT
int i2=mid+1; ZcYh) HD
for(int cur=l;cur<=r;cur++){ B7]MGXC
if(i1==mid+1) P'Q+GRpSw
data[cur]=temp[i2++]; D-N8<:cA
else if(i2>r) H.UX,O@
data[cur]=temp[i1++]; [V:\\$
else if(temp[i1] data[cur]=temp[i1++]; 2k<;R':
else fA89|NTSUh
data[cur]=temp[i2++]; |r bWYl.b
} {/pm<k=
} ;NRF=d>
*{+G=d
} .CFa9"<
"?mJqA
改进后的归并排序: kY'T{Sm1^
awz;z?~
package org.rut.util.algorithm.support; 6]-SK$
\(%Y%?dy
import org.rut.util.algorithm.SortUtil; } CfqG?)
*YlV-C<}W"
/** j!3 Gz
* @author treeroot 1IVuSp`{FU
* @since 2006-2-2 tY
<Z'xA?
* @version 1.0 VcoOeAKL
*/ *_ ?dVhxf
public class ImprovedMergeSort implements SortUtil.Sort { 0:b2(^]bg
uw2hMt (N
private static final int THRESHOLD = 10; v%ioj0,
D1&A,2wO
/* 5ms""LD/
* (non-Javadoc) -+O
9<3ly
* +5XpzZ{#Wa
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6"}?.E$
*/ Z>
r^SWL
public void sort(int[] data) { K#"O
a
h
int[] temp=new int[data.length]; x.q+uU$^
mergeSort(data,temp,0,data.length-1); L5,NP5RC
} ;amXY@RmH
) Yd?m0m*
private void mergeSort(int[] data, int[] temp, int l, int r) { v,ju!I0.
int i, j, k; NC38fiH_N
int mid = (l + r) / 2; >;[*!<pfK5
if (l == r) -a-(r'Qc(
return; [Jv@J\
if ((mid - l) >= THRESHOLD) #t+d iR
mergeSort(data, temp, l, mid); f%*/cpA)
else 8]LD]h)B"
insertSort(data, l, mid - l + 1); Z4\=*ic@
if ((r - mid) > THRESHOLD) w4gg@aO
mergeSort(data, temp, mid + 1, r); |iwP:C^\mJ
else _]:z \TDn
insertSort(data, mid + 1, r - mid); #_u~/jhX
Hhh0T>gi
for (i = l; i <= mid; i++) { KRA/MQ^7~U
temp = data; _F`lq_C
} /3{b%0Aa
for (j = 1; j <= r - mid; j++) { s)pbS}L
temp[r - j + 1] = data[j + mid]; "
W|%~h
} Q@HopiC
int a = temp[l]; {E8~Z8tT
int b = temp[r]; 1@-Ns
for (i = l, j = r, k = l; k <= r; k++) { <%"b9T`'
if (a < b) { hq #?kN
data[k] = temp[i++]; \o^2y.q:>
a = temp; j*vYBGD
} else { #Q
/Arq
data[k] = temp[j--]; sQ\8>[]
b = temp[j]; 3p'I5,}
} Cid
;z
} GmP@;[H"
} 8Q'0h
m?
1Yn
+<I
/** \*<d{gZ~
* @param data H/37)&$E(
* @param l qXwPDq/
* @param i >j QWn@
*/ J7g8D{4
private void insertSort(int[] data, int start, int len) { - RU=z!{
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); :\o {_
} s']Bx=
} $A-J,_:T<
} \vO,Ee~#W
?)ONf#4Y
}