归并排序: frN3S
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package org.rut.util.algorithm.support; 5+P@sD
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import org.rut.util.algorithm.SortUtil; sG,+
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/** alm-
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* @author treeroot J!h^egP
* @since 2006-2-2 <\@1Zz@ms
* @version 1.0 9vI]LfP
*/ Ht[{ryTxu
public class MergeSort implements SortUtil.Sort{ 6;oe=Q:Q
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/* (non-Javadoc) d~*TIN8Ke~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &|5GB3H=
*/ 6)e5zKW!?
public void sort(int[] data) { b |7ja_
int[] temp=new int[data.length]; ._CP%
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mergeSort(data,temp,0,data.length-1); zgKY4R{V
} R$m`Z+/@
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private void mergeSort(int[] data,int[] temp,int l,int r){ .Q>!B?)
int mid=(l+r)/2; Vq ^]s$'
if(l==r) return ; Zb''mf\
mergeSort(data,temp,l,mid); cxP6-tV%
mergeSort(data,temp,mid+1,r); *P2[qhP2
for(int i=l;i<=r;i++){ o a<q /
temp=data; 8`v$liH
} {6
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int i1=l; eThy+
int i2=mid+1; KhaYr)&~
for(int cur=l;cur<=r;cur++){ hu5!ev2
if(i1==mid+1) !/I0i8T
data[cur]=temp[i2++]; z4M1D9iPY
else if(i2>r) `UzVS>]l[+
data[cur]=temp[i1++]; $.K?N@(W
else if(temp[i1] data[cur]=temp[i1++]; GsV4ZZ
else ZR3nK0
data[cur]=temp[i2++]; P $>`
} Mm=Mz
} z?ucIsbR
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} $=aI"(3&
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改进后的归并排序: $L}aQlA1JM
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package org.rut.util.algorithm.support; cF+ X,]=6
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import org.rut.util.algorithm.SortUtil; &M"ouy Zo9
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/** g-)mav
* @author treeroot IazkdJX~
* @since 2006-2-2 2x}6\t
* @version 1.0 JW+*d`8Z[
*/ ^toAw8A=@0
public class ImprovedMergeSort implements SortUtil.Sort { uJow7-FD
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private static final int THRESHOLD = 10; .v`b[4M4
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/* h)x_zZ%>o
* (non-Javadoc) r%=[},JQ
* #V_GOy1-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >bm|%Ou"
*/ 1]OSWCEm*[
public void sort(int[] data) { 4zc<GL3[
int[] temp=new int[data.length]; \,xFg w4
mergeSort(data,temp,0,data.length-1); kU*{4G|6
} 'Z8aPHD
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private void mergeSort(int[] data, int[] temp, int l, int r) {
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int i, j, k; dbF M,"^
int mid = (l + r) / 2; <$Yi]ty
if (l == r) 8 %Sb+w07
return; (H#M<N
if ((mid - l) >= THRESHOLD) 8k!6b\Imz
mergeSort(data, temp, l, mid); Wd 2sh
else t9
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insertSort(data, l, mid - l + 1); }STYG`
if ((r - mid) > THRESHOLD) u?0d[mC
mergeSort(data, temp, mid + 1, r); rU\[SrIhz
else 2[R$RpA_
insertSort(data, mid + 1, r - mid); LI
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for (i = l; i <= mid; i++) { ]H[8Z|i""
temp = data; CjZ2z%||=
} ]T<^{jG
for (j = 1; j <= r - mid; j++) { >)#c\{c
temp[r - j + 1] = data[j + mid]; M?@pN<|
} - r#K#v3
int a = temp[l]; `/:cfP\
int b = temp[r]; t1i(;|8|
for (i = l, j = r, k = l; k <= r; k++) { ')TPF{\#
if (a < b) { 3LK%1+)4
data[k] = temp[i++]; +=fKT,-*G!
a = temp; e3(<8]`b[
} else { R}{GwbF_\
data[k] = temp[j--]; #gv4
b = temp[j]; ;e{5)@h$
} ^ddO&!U
} ")`S0n5e
} v '9m7$
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/** `deYi 2z
* @param data Y1\K;;X
* @param l w~@[r4W
* @param i 32>x^>G=>
*/ Cvn$]bt/s
private void insertSort(int[] data, int start, int len) { U{#xW
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ZKdh%8C
} >&K!VQ{g
} >)c9|e=8
} KD*O%@X5C
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}