归并排序: 3&*'6D
Tg
]vo_gKZ
package org.rut.util.algorithm.support; Gr)-5qh
9_huI'"p
import org.rut.util.algorithm.SortUtil; m{(+6-8|m
/Ox)|)l
/** G]*|H0j
* @author treeroot 1;wb(DN*c
* @since 2006-2-2 m,tXE%l
* @version 1.0 7NF/]y4w
*/ J?Iq9f
public class MergeSort implements SortUtil.Sort{ +jV_Wz
li/aN
/* (non-Javadoc) yV]xRaRr2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +m/,,+4
*/ Jqfm@Y
public void sort(int[] data) { u#jC#u^M
int[] temp=new int[data.length]; +)/Uu3"=
mergeSort(data,temp,0,data.length-1); {#hVD4$b
} E%3TP_B3
wahZK~,EaY
private void mergeSort(int[] data,int[] temp,int l,int r){ rFu ez$
int mid=(l+r)/2; -s"0/)HD
if(l==r) return ; !7 _\P7M
mergeSort(data,temp,l,mid); GdA.g
w
mergeSort(data,temp,mid+1,r); /[pqI0sf<A
for(int i=l;i<=r;i++){ x$B&L`QV
temp=data; AH d-
} _gV8aH ZyM
int i1=l; G[z
.&l
int i2=mid+1; qrBZvJU
for(int cur=l;cur<=r;cur++){ D}{b;Un
if(i1==mid+1) xsP4\C>
data[cur]=temp[i2++]; G{lcYP O
else if(i2>r) N|dD!
data[cur]=temp[i1++]; _>_j\b
else if(temp[i1] data[cur]=temp[i1++]; @ 4UxRp6+
else QLr9dnA
data[cur]=temp[i2++]; PT]GJ<K/
} |NMO__l@
} [1(FgyE
w^;DG
} o`? zF+M0
OJ3UE(,I=
改进后的归并排序: .eF_cD7v
EHI 'xt
package org.rut.util.algorithm.support; GozPvR^/
g22gIj]
import org.rut.util.algorithm.SortUtil; =m tY
' [p)N,
/** \}dyS8
* @author treeroot ZYMw}]#((E
* @since 2006-2-2 id,NONb\
* @version 1.0 Ge \["`;i
*/ 4JMiyiW&
public class ImprovedMergeSort implements SortUtil.Sort { /q1s;I
yyP-=Lhmo=
private static final int THRESHOLD = 10; iRw&49
};katqzEg
/* @;)PSp*j
* (non-Javadoc) ;y1Q6eN
* vg\/DbI'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `_qK&&s
*/ Z4q~@|+%
public void sort(int[] data) { UA-7nb
int[] temp=new int[data.length]; }Dfwm)]Q
mergeSort(data,temp,0,data.length-1); <hvRP!~<)
} 1>pe&n/
J;QUPpHZ
private void mergeSort(int[] data, int[] temp, int l, int r) { $G!R,eQ
int i, j, k; 2QUx&u:
int mid = (l + r) / 2; sYn[uPefj
if (l == r) Vxdp|
return; 82:Wvp6
if ((mid - l) >= THRESHOLD) x` /)g(
mergeSort(data, temp, l, mid); "/+zMLY
else Qn+:/zA;
insertSort(data, l, mid - l + 1); b2)\
MNH
if ((r - mid) > THRESHOLD) 7P**:b
mergeSort(data, temp, mid + 1, r); <$i4?)f(
else D"l+iVbBP
insertSort(data, mid + 1, r - mid); j^SZnMQf
g>j| ]6
for (i = l; i <= mid; i++) { SF<Vds}A2
temp = data; f =s&n}
} ?M}S|dsmE
for (j = 1; j <= r - mid; j++) { l-)Bivoi
temp[r - j + 1] = data[j + mid]; Q*ju
sm
} _8fA?q=
int a = temp[l]; JK)qZ=
int b = temp[r]; 46x.i;b7
for (i = l, j = r, k = l; k <= r; k++) { U
?b".hJ2
if (a < b) { (q;bg1\UK
data[k] = temp[i++]; 6|;Uq'
a = temp; }nrXxfu
} else { $yb@
Hhx>
data[k] = temp[j--]; !xK=#pa
b = temp[j]; eSy(~Y
} [kB
`
} a.%LHb
} fi%r<]@
p{tK_ZBy]c
/** nzsl@1s
* @param data %J7UP4
* @param l ZxHJ<2oD
* @param i @wN
G
*/ nHst/5dA
private void insertSort(int[] data, int start, int len) { < n?=|g
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); cy3Td28,
} EbK0j?
} &t}?2>:
} \~DM
gPXa>C
}