归并排序: v&CO#vK5.
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package org.rut.util.algorithm.support; 8^f[-^%
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import org.rut.util.algorithm.SortUtil; z*k3q`=>
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/** Y(G*Yi?;
* @author treeroot O7<V@GL+
* @since 2006-2-2 Ygkd~g
* @version 1.0 fXXm@tMx>
*/ Cn./N aq
public class MergeSort implements SortUtil.Sort{ h.s<0.
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/* (non-Javadoc) ^v'g ~+@o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) x"C93ft[
*/ BB73'W8y
public void sort(int[] data) { CDTk
int[] temp=new int[data.length]; zm)CfEF
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mergeSort(data,temp,0,data.length-1); ^) b7m
} +G=C~X
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private void mergeSort(int[] data,int[] temp,int l,int r){ D^R! |K/
int mid=(l+r)/2; b09#+CH?
if(l==r) return ; |\r\i&|g1
mergeSort(data,temp,l,mid); L+0N@`nRF
mergeSort(data,temp,mid+1,r); 6Nd_YX
for(int i=l;i<=r;i++){ UgP=k){
temp=data; FDGKMGZ
} !f]3Riw-=,
int i1=l; J\,e/{,X
int i2=mid+1; hoD[wAC
for(int cur=l;cur<=r;cur++){ 5-QvQ&eH.
if(i1==mid+1) raI~BIfe
data[cur]=temp[i2++]; $Ln2O#
else if(i2>r) j"$b%|
data[cur]=temp[i1++]; lj}1'K@M
else if(temp[i1] data[cur]=temp[i1++]; PRf\6
else A&_i]o
data[cur]=temp[i2++]; *}WqYqOow
} ?$8 ,j+&I
} EpoQV ^Ey
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} Ad N=y8T
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改进后的归并排序: 7_'k`J@_
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package org.rut.util.algorithm.support; HIp {< M3
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import org.rut.util.algorithm.SortUtil; fS$Yl~-m?
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/** NN pa69U
* @author treeroot r'JK$9
* @since 2006-2-2 >, Swk3
* @version 1.0 T.Y4L
*/ Yr(f iI
public class ImprovedMergeSort implements SortUtil.Sort { +WEO]q?K
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private static final int THRESHOLD = 10; ah@GSu;7
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/* Z(`K6`KM
* (non-Javadoc) &)'kX
* '`A67bdq)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P*^UU\x'4I
*/ GMp'KEQQ
public void sort(int[] data) { AxqTPx7`|
int[] temp=new int[data.length]; "@<g'T0
mergeSort(data,temp,0,data.length-1); /)<7$
} 0BwQ!B.
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private void mergeSort(int[] data, int[] temp, int l, int r) { w\Eve:
int i, j, k; 'A@Oia1;{
int mid = (l + r) / 2; C g,w6<7
if (l == r) o>k-~v7
return; u^eC
if ((mid - l) >= THRESHOLD) Hn2Q1lF-ip
mergeSort(data, temp, l, mid); _xwfz]lb+
else <qj@waKw4
insertSort(data, l, mid - l + 1); cngPc]?N
if ((r - mid) > THRESHOLD) K>p:?w
mergeSort(data, temp, mid + 1, r); Uc;IPS
else 5TW<1'u
insertSort(data, mid + 1, r - mid); O#Ax P}
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for (i = l; i <= mid; i++) { 3G0\i!*t
temp = data; [8g\pPQ
} C4d1*IQk
for (j = 1; j <= r - mid; j++) { OpX
temp[r - j + 1] = data[j + mid]; ~CTRPH
} Yy:sZJ
int a = temp[l]; "Q!{8 9Y
int b = temp[r]; us *l+Jw,m
for (i = l, j = r, k = l; k <= r; k++) { K?<Odw'k
if (a < b) { ov.rHVeI
data[k] = temp[i++]; L7'X7WYf&
a = temp; .3SjkC4I
} else { )W7H{#
data[k] = temp[j--]; ;7{wa]
b = temp[j]; KD<`-b)7<
} JZ0+VB-3U
} !Dn1pjxc
} |&*rSp2iH
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/** T{2//$T?
* @param data jtC ob'n8
* @param l <^$b1<@
* @param i GdwHm
*/ =7Gi4X%
private void insertSort(int[] data, int start, int len) { \FX3=WW
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); xg!\C@$
} UE](`|4H
} 9K_HcLO%y
} ^Q:`2C5
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}