归并排序: IW-|"5?9'
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package org.rut.util.algorithm.support; >s1?rC
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import org.rut.util.algorithm.SortUtil; *adznd
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/** $cU7)vmK`
* @author treeroot B2|0.G|[j
* @since 2006-2-2 DIJmISk
* @version 1.0 )dh`aQ%N "
*/ RD=V`l{Z
public class MergeSort implements SortUtil.Sort{ Hsd76z#8
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/* (non-Javadoc) c((bUjS'=Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B9%%jEH*
*/ dZI["FeO&d
public void sort(int[] data) { 67
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int[] temp=new int[data.length]; >#Xz~xI/I
mergeSort(data,temp,0,data.length-1); ;tF&r1
} R[)bGl6#
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private void mergeSort(int[] data,int[] temp,int l,int r){ p1K]m>Y{?
int mid=(l+r)/2; 4nGt*0Er
if(l==r) return ; Uw!d;YQm
mergeSort(data,temp,l,mid); z(EpJK=`_
mergeSort(data,temp,mid+1,r); /7fd"U$Lh
for(int i=l;i<=r;i++){ '@Yp@
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temp=data; e`q*'u1?
} 7(a1@V H
int i1=l; WW>m`RU`
int i2=mid+1; Tj{3#?]Ho
for(int cur=l;cur<=r;cur++){ h+A+>kC5
if(i1==mid+1) t\TxK7i
data[cur]=temp[i2++]; El: @l%
else if(i2>r) &Yc'X+'4
data[cur]=temp[i1++]; #TC}paIpj
else if(temp[i1] data[cur]=temp[i1++]; y)a)VvU":
else r-*6#
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data[cur]=temp[i2++]; ;r&Z?B$
} s9OW.i]zX
} 4nQ5zwiV
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改进后的归并排序: K+XUC
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package org.rut.util.algorithm.support; d3S Me
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import org.rut.util.algorithm.SortUtil; 3HW&\:q5'M
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/** 'W>y v
* @author treeroot S^|U"
* @since 2006-2-2
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* @version 1.0 R!lug;u#
*/ jzGK(%sw"
public class ImprovedMergeSort implements SortUtil.Sort { xI~AZ:m
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private static final int THRESHOLD = 10; {@3v$W~7M
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/* ';My"/
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* (non-Javadoc) L F } d
* TA2ETvz^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZS;V?]\(
*/ q-ko)]
public void sort(int[] data) { he:z9EG}
int[] temp=new int[data.length]; W$()W)
mergeSort(data,temp,0,data.length-1); `wQs$!a
} }f14# y;
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private void mergeSort(int[] data, int[] temp, int l, int r) { DV[FZ
int i, j, k; `b] wyP
int mid = (l + r) / 2; w0lgB%97p
if (l == r) i/H;4#Bz
return; }!R*Q`m
if ((mid - l) >= THRESHOLD) 8iOHav4
mergeSort(data, temp, l, mid); P:N>#G~z
else c$^v~lQS
insertSort(data, l, mid - l + 1); H{,1-&>|
if ((r - mid) > THRESHOLD) QKB+mjMH#x
mergeSort(data, temp, mid + 1, r); Us!ZQ#pP
else ]Y!Fz<-;P
insertSort(data, mid + 1, r - mid); %7P]:G+Y\
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for (i = l; i <= mid; i++) { Ui" {0%
temp = data; _q4O2Fx0
} $/tj<++W
for (j = 1; j <= r - mid; j++) { eq(h{*rC
temp[r - j + 1] = data[j + mid]; 1"75+Q>D
} v}a{nU'
int a = temp[l]; ~:o$}`mW
int b = temp[r]; kGo2R]Dd[
for (i = l, j = r, k = l; k <= r; k++) { _$5DK%M}
if (a < b) { w,vnpdT
data[k] = temp[i++]; I`rN+c:
a = temp; \Cj3jg
} else { SQn.`0HT
data[k] = temp[j--]; VjNr<~ |d
b = temp[j]; \k`9s
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} }r,xx{.u7
} |N"K83_pr
} W Zm8!Y
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/** ( $2M"n
* @param data 1iLo$
* @param l 2IRARZ,3
* @param i 8Q$WwiS
*/ F[yofRN
private void insertSort(int[] data, int start, int len) { <!XunXh
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +6P[TqR
} ab%I&B<b
} v;9(FLtL
} B5vLV@>]
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}