归并排序: H,]8[qT<
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package org.rut.util.algorithm.support; :~ pGHl
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import org.rut.util.algorithm.SortUtil; KEtV
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/** .ojEKu+EJ'
* @author treeroot gYhY1Mym
* @since 2006-2-2 `p&[b]b
* @version 1.0 >*RU:X
*/ <mQXS87
public class MergeSort implements SortUtil.Sort{ LP6p
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/* (non-Javadoc) SK
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _8a;5hS
*/ qS#G7~ur>y
public void sort(int[] data) { Hl,{4%]
int[] temp=new int[data.length]; >=[uLY[aK
mergeSort(data,temp,0,data.length-1); S[1<Qrv]
} hE|P|0U,n
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private void mergeSort(int[] data,int[] temp,int l,int r){ ,c4HicRJ#
int mid=(l+r)/2; X>8,C^~$1
if(l==r) return ; g3z/yj
mergeSort(data,temp,l,mid); y6nP=g|')>
mergeSort(data,temp,mid+1,r); 8@;]@c)m
for(int i=l;i<=r;i++){ zMR)w77
temp=data; q2*A'C
} A#.
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int i1=l; xIGq+yd(
int i2=mid+1; eAf i!!Z<
for(int cur=l;cur<=r;cur++){ |tGUx*NN
if(i1==mid+1) 1Ng+mT
data[cur]=temp[i2++]; >\d&LLAe
else if(i2>r) =p8uP5H
data[cur]=temp[i1++]; BB6[(Z
else if(temp[i1] data[cur]=temp[i1++]; ^O18\a
else jc&k-d>=G
data[cur]=temp[i2++]; !&{rnK
} {4D`VfX_
} 5dm ~yQN/
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} o]4]fLQ
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改进后的归并排序: 3PE.7-HF
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package org.rut.util.algorithm.support; I/`"lAFe
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import org.rut.util.algorithm.SortUtil; `gX|q3K\s
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/** oZa'cZNs
* @author treeroot 'OsZD?W{
* @since 2006-2-2 8M99cx*K
* @version 1.0 wM+1/[7
*/ ^.6[vmmq
public class ImprovedMergeSort implements SortUtil.Sort { JM3[
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private static final int THRESHOLD = 10; X:oOp=y]|
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/* krUtOVI
* (non-Javadoc) Vh^y6U<
* ^ Oh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XOvJlaY)'.
*/ yp#!$+a}
public void sort(int[] data) { N1$u@P{
int[] temp=new int[data.length]; ,^:{!?v
mergeSort(data,temp,0,data.length-1); i"h\*B=
} 8zp?WUb
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private void mergeSort(int[] data, int[] temp, int l, int r) {
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int i, j, k; AELj"=RA
int mid = (l + r) / 2; "+(|]q"W
if (l == r) N d].(_
return; ubwM*P
if ((mid - l) >= THRESHOLD) jH<
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mergeSort(data, temp, l, mid); 1&|]8=pG7
else {DRk{>K,
insertSort(data, l, mid - l + 1); *?FVLE
if ((r - mid) > THRESHOLD) GbSCk}>
mergeSort(data, temp, mid + 1, r); P8eCaZg?(3
else C[L 5H
insertSort(data, mid + 1, r - mid); EhxpMTS
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for (i = l; i <= mid; i++) { .PB!1C.}@
temp = data; o{PG&
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} !*-|!Vz
for (j = 1; j <= r - mid; j++) { S(gr>eC5
temp[r - j + 1] = data[j + mid]; cnu&!>8V
} IL*B@E8
int a = temp[l]; .KrLvic
int b = temp[r]; ?2]fE[SqY
for (i = l, j = r, k = l; k <= r; k++) { @7Ec(]yp
if (a < b) { f/)Y {kS6
data[k] = temp[i++]; QP(0
a = temp; y98FEG#S}
} else { (VeK7cU
data[k] = temp[j--]; M+ +Dk7B
b = temp[j]; zjmoIE
} P~j#8cH7
} Bgxk>Y
} S2$66xr#
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/** #
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* @param data 7m2iL#5[
* @param l \D@j`o
* @param i Z[#8F&QV!m
*/ 2R\K!e
private void insertSort(int[] data, int start, int len) { 5i[O\@]5
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); A(2 0+
} V'kBF2}
} |5^
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} C
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}