归并排序: /.7x[Yc
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package org.rut.util.algorithm.support; JI@~FD&
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import org.rut.util.algorithm.SortUtil; w[:5uo(
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/** QO%>RG
* @author treeroot KDg!Y(m{
* @since 2006-2-2 rQN+x|dKMb
* @version 1.0 r(J7&vR}h
*/ ' G)Wy|*
public class MergeSort implements SortUtil.Sort{ QF!K$?EU[
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/* (non-Javadoc) %D e<H*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |)
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*/ C@hnT<e
public void sort(int[] data) { 6Q>:g"_
int[] temp=new int[data.length]; $N:m
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mergeSort(data,temp,0,data.length-1); d=N5cCqq
} u&2uQ-T0
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private void mergeSort(int[] data,int[] temp,int l,int r){ ag[ yM
int mid=(l+r)/2; [ivJ&'vB
if(l==r) return ; JFR,QUT
mergeSort(data,temp,l,mid); j$N`JiKM
mergeSort(data,temp,mid+1,r); |44CD3A%
for(int i=l;i<=r;i++){ ''v_8sv
temp=data; o6Vc}jRH
} }*IX34
int i1=l; n3~xiQ'
int i2=mid+1; )wSsxX7:
for(int cur=l;cur<=r;cur++){ >SSF:hI"J
if(i1==mid+1) 4'G<qJoc
data[cur]=temp[i2++]; Lr40rLx;u
else if(i2>r) NVJvCs)3f
data[cur]=temp[i1++]; /`:5#O
else if(temp[i1] data[cur]=temp[i1++]; O:p~L`o>>
else H)t8d_^|j
data[cur]=temp[i2++]; XW5r@:e
} PM o>J|^
} X
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改进后的归并排序: S WYiI
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package org.rut.util.algorithm.support; e?RHf_d3T-
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import org.rut.util.algorithm.SortUtil; PNg, bcl
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/** CNfeHMT
* @author treeroot Jq/([
* @since 2006-2-2 0#XZ_(@%
* @version 1.0 Gq+!%'][P
*/ RHVMlMX
public class ImprovedMergeSort implements SortUtil.Sort { W#-M|
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private static final int THRESHOLD = 10; ExY
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/* $;$_N43
* (non-Javadoc) b.j\=c
* *gVRMSrx4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \u",bMQF
*/ 6dq5f?w]
public void sort(int[] data) { 'rq
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int[] temp=new int[data.length]; oy/#,R_n%
mergeSort(data,temp,0,data.length-1); jNrGsIY$
} j/dNRleab
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private void mergeSort(int[] data, int[] temp, int l, int r) { k\zN h<^
int i, j, k; -DU[dU*~
int mid = (l + r) / 2; 'OkF.bs
if (l == r) 611:eLyy&l
return; M)Ogb'@#
if ((mid - l) >= THRESHOLD) 0&c12W|B<L
mergeSort(data, temp, l, mid); 0'VwObq
else fu\M2"e
insertSort(data, l, mid - l + 1); a?\
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if ((r - mid) > THRESHOLD)
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mergeSort(data, temp, mid + 1, r); y*|"!FK
else Be0P[v
insertSort(data, mid + 1, r - mid); =,,!a/U
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for (i = l; i <= mid; i++) { )P\ec
temp = data; GP`_R
} FW=oP>f]w
for (j = 1; j <= r - mid; j++) { AqE . TK
temp[r - j + 1] = data[j + mid]; ;`s/|v
} ze!7qeW
int a = temp[l]; ;]vE"M x$
int b = temp[r]; ix*n<lCoC
for (i = l, j = r, k = l; k <= r; k++) { dM#\h*:=
if (a < b) { e"[o2=v;5
data[k] = temp[i++]; }|AUV
a = temp; %'k^aqFL
} else { u@[D*c1!H
data[k] = temp[j--]; vKol@7%N
b = temp[j]; U6n%rdXJ=
} 9M<qk si
} ]NG`MZ
} Rf2;O<
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/** mqw&SxU9
* @param data vezX/x D?
* @param l ^e^M
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* @param i 8]'qJ;E2
*/ l*b3Mg
private void insertSort(int[] data, int start, int len) { w+*Jl}&\
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ` *h-j/M
} rjx6Ad/\
} ?uOdqMJV
} f!0* ^d
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}