归并排序: (aa}0r5
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package org.rut.util.algorithm.support; fR6.:7&
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import org.rut.util.algorithm.SortUtil; F4%vEn\!
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/** jaq`A'o5
* @author treeroot K=`;D
* @since 2006-2-2 bPHqZ*f
* @version 1.0 $pOgFA1'
*/ +bv-! rf
public class MergeSort implements SortUtil.Sort{ 4fp]z9Y
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/* (non-Javadoc) bRzw.(k0`r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \L@DDK|"`6
*/ a1nj}1M%
public void sort(int[] data) { S66..sa
int[] temp=new int[data.length]; {~RS$ |
mergeSort(data,temp,0,data.length-1); b\^q9fy
} s wIJmA
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private void mergeSort(int[] data,int[] temp,int l,int r){ Ws>2S
int mid=(l+r)/2; fqcFfz6?x
if(l==r) return ; ]sf1+3
mergeSort(data,temp,l,mid); aHvsgp]
mergeSort(data,temp,mid+1,r); 3.^Tm+ C
for(int i=l;i<=r;i++){ '3MCb
temp=data; B}YpIb]d
} m2o)/:
int i1=l; |`50Tf\J
int i2=mid+1; u^!c:RfE?
for(int cur=l;cur<=r;cur++){ 861!p%y5
if(i1==mid+1) _:Jra
data[cur]=temp[i2++]; ^`&?"yj<z
else if(i2>r) Cm5:_K`;]
data[cur]=temp[i1++]; R^*h|7)E
else if(temp[i1] data[cur]=temp[i1++]; Z1t?+v+Ro*
else dY'mY ~Tv
data[cur]=temp[i2++]; t@(`24
} `0qBuE_^h
} KS6H`Mm}/
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} :jc
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改进后的归并排序: )GpH5N'EI
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package org.rut.util.algorithm.support; xc HG5bg|
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import org.rut.util.algorithm.SortUtil; 10 D6fkjf
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/** 8 FqhSzw
* @author treeroot RTgR>qI&)
* @since 2006-2-2 |<q9Ee
* @version 1.0 gPu0j4&-
*/ JXBTd=r_oM
public class ImprovedMergeSort implements SortUtil.Sort { #cRw0bn:
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private static final int THRESHOLD = 10; lW!}OzE(m
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/* )t-Jc+*A>
* (non-Javadoc) wf=
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* m<DiYxK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y
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*/ WjrUns
public void sort(int[] data) { CfWtCA
int[] temp=new int[data.length]; %bp8VR sY
mergeSort(data,temp,0,data.length-1); 7K|:
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} 0xe!tA
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private void mergeSort(int[] data, int[] temp, int l, int r) { LXm5f;
int i, j, k; d\R]>
int mid = (l + r) / 2; w!=Fi
if (l == r) p? dXs^ c
return; *+-L`b{SX
if ((mid - l) >= THRESHOLD) ?y@ RE
mergeSort(data, temp, l, mid); qXH\e|
else mF?GQls`
insertSort(data, l, mid - l + 1); -666|pA
if ((r - mid) > THRESHOLD) ]ZB^Hi_
mergeSort(data, temp, mid + 1, r); (|F } B
else ZDI%?.U
insertSort(data, mid + 1, r - mid); P a{)@xT
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for (i = l; i <= mid; i++) { l|O)B #
temp = data; |Mm9QF;iA
} GomTec9.
for (j = 1; j <= r - mid; j++) { (61_=,jv\h
temp[r - j + 1] = data[j + mid]; ^zMME*G
} VGVZ`|
int a = temp[l]; [CBhipoc
int b = temp[r]; QB Nnvg4v
for (i = l, j = r, k = l; k <= r; k++) { b~1]}9TJ
if (a < b) { }nQni?
data[k] = temp[i++]; 0! :1o61
a = temp; &7{/ x~S{
} else { U8T"ABvFP
data[k] = temp[j--]; b* QRd
b = temp[j]; h27awO
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} }[[
} vu&%e\gM
} _ 2WG6y;
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/** qNLG- m,n<
* @param data ZwV`} 2{
* @param l lYS+EVcR
* @param i me#?1r
*/ $ON4nx
private void insertSort(int[] data, int start, int len) { abHW[VP9
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Vu%XoI)<KY
} vBMuV pzO
} $ylQ \Y'
} \G3P[E[
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}