归并排序: z] @W[MHY
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package org.rut.util.algorithm.support; ?ow'^X-
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import org.rut.util.algorithm.SortUtil; aIGn9:\
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/** {-*\w-~G
* @author treeroot W\ULUK
* @since 2006-2-2 mf*Nr0L;J
* @version 1.0 (iDBhC;/B
*/ G8NRj9k?
public class MergeSort implements SortUtil.Sort{ z g]Drm
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/* (non-Javadoc) b!~TAT&8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kfpm=dKL
*/ 5~\Kj#PBx
public void sort(int[] data) { I]sqi#h$2W
int[] temp=new int[data.length]; &X w`T9<
mergeSort(data,temp,0,data.length-1); %F$N#YG
} J%r7<y\
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private void mergeSort(int[] data,int[] temp,int l,int r){ /"0as_L<
int mid=(l+r)/2; 2oNV=b[
if(l==r) return ; u
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mergeSort(data,temp,l,mid); \|{*arS
mergeSort(data,temp,mid+1,r); 7t4v~'h;5e
for(int i=l;i<=r;i++){ Z% Z"VoxH
temp=data; ggCr-
} *98Ti|
int i1=l; di_gWE
int i2=mid+1; j6X LyeG7
for(int cur=l;cur<=r;cur++){ 4]"w b5%
if(i1==mid+1) fu>Qi)@6a1
data[cur]=temp[i2++]; <lx^aakk!
else if(i2>r) X\G)81Q.S
data[cur]=temp[i1++]; wF;B@
else if(temp[i1] data[cur]=temp[i1++]; U(A4v0T
else XIN5a~[z*
data[cur]=temp[i2++]; LD@7(?mlU
} ^?Vq L\V5
} DB Xm
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} -RCv7U`
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改进后的归并排序: j&llrN
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package org.rut.util.algorithm.support; vcOsq#UW
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import org.rut.util.algorithm.SortUtil; 8DL hk
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/** ^^Bm$9
* @author treeroot Uf[T _
* @since 2006-2-2 Rf8:+d[Jj|
* @version 1.0 o~}1oN
*/ yr{5Rp05=
public class ImprovedMergeSort implements SortUtil.Sort { RR'(9QJ$
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private static final int THRESHOLD = 10; )ys=+Pz
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/* _}z_yu#jY
* (non-Javadoc) ox
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* I W8.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g?$e^ls
*/ z-)*Q
public void sort(int[] data) { P[1m0!,B
int[] temp=new int[data.length]; 8 +L7E-
mergeSort(data,temp,0,data.length-1); xK=J.>h3
} IKtiR8
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private void mergeSort(int[] data, int[] temp, int l, int r) { IF$^0q
int i, j, k; q'fPNQg
int mid = (l + r) / 2; Kd
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if (l == r) dd19z%
return; Cl-S=q@>V
if ((mid - l) >= THRESHOLD) tbRE/L<
mergeSort(data, temp, l, mid); cC'^T6
else l92!2$]b
insertSort(data, l, mid - l + 1); Y"s
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if ((r - mid) > THRESHOLD) 8t--#sDy{0
mergeSort(data, temp, mid + 1, r); s.bT[0Vl
else 0~:eSWz=
insertSort(data, mid + 1, r - mid); M@5KoMsB9
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for (i = l; i <= mid; i++) { GW:\l~ d
temp = data; 8_+vb#M
} rt,0j/o.1
for (j = 1; j <= r - mid; j++) { #Ul4&QVeg
temp[r - j + 1] = data[j + mid]; *+NZQjl'
} ZtKQ]jV&@
int a = temp[l]; dqL-'
int b = temp[r]; KWtu,~O_u
for (i = l, j = r, k = l; k <= r; k++) { '[n)N@h
if (a < b) { }^IwQm*i
data[k] = temp[i++]; f>?^uSpWH
a = temp; IMw
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} else { dp33z"<3
data[k] = temp[j--]; X!2.IsIS8
b = temp[j]; QId"Cl)3
} li1v 4
} $:PF9pY(
} .<0=a|IAz
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/** tru;;.lj8K
* @param data fuQ4rt[i
* @param l o- cj&Cv%
* @param i X9DM^tt
*/ @'@s*9Nr
private void insertSort(int[] data, int start, int len) { 3^j~~"2,w
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y @]8Ep
} V^9$t/c&
} |K'Gw}fX/
} ze*&*csO
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}