归并排序: ]J '#KT{
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package org.rut.util.algorithm.support; AhyV
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import org.rut.util.algorithm.SortUtil; |>'.(
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/** $ [t7&e
* @author treeroot _N @h
* @since 2006-2-2 ;q"Yz-3
* @version 1.0 ~[N"Q|D3Y
*/ )qID<j#
public class MergeSort implements SortUtil.Sort{ D4G*Wz8
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/* (non-Javadoc) ~dtS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) HL`=zB%
*/ :-[y`/R
public void sort(int[] data) { |_h$}~;
int[] temp=new int[data.length]; qH=<8Iu
mergeSort(data,temp,0,data.length-1); )0 1,3J>#
}
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private void mergeSort(int[] data,int[] temp,int l,int r){ ~K2.T7=
int mid=(l+r)/2; m)1+D"z
if(l==r) return ; f{HjM?
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mergeSort(data,temp,l,mid); > N bb0T
mergeSort(data,temp,mid+1,r); o5(~nQ
for(int i=l;i<=r;i++){ i"_@iN0N
temp=data; dSP~R
} K*/X{3 J;
int i1=l; c/'Cju W
int i2=mid+1; Iq?#kV9)
for(int cur=l;cur<=r;cur++){ qlU"v)Mx
if(i1==mid+1) Sb|9U8h
data[cur]=temp[i2++]; >WZ_) `R
else if(i2>r) $sxm MP
data[cur]=temp[i1++]; [Yyb)Qf
else if(temp[i1] data[cur]=temp[i1++]; vVyX[ZZ
else p"dK,A5#)
data[cur]=temp[i2++]; x| =]Xxco
} O;6am++M@
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改进后的归并排序: |y%M";MI
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package org.rut.util.algorithm.support; = }!4%.$
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import org.rut.util.algorithm.SortUtil; FhFP M)[
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/** +oRBSAg -
* @author treeroot s#*
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* @since 2006-2-2 %+bw2;a6
* @version 1.0 - %'ys
*/ F8pP(Wl
public class ImprovedMergeSort implements SortUtil.Sort { \:5M0
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private static final int THRESHOLD = 10; O/ih9,
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/* 8h '~*
* (non-Javadoc) z#u<]] 5
* N]dsGvX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %NH{%K,
*/ l\DcXgD
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public void sort(int[] data) { xV\mS+#
int[] temp=new int[data.length]; 50R&;+b
mergeSort(data,temp,0,data.length-1); uG^RU\(
} K)&oDwk
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private void mergeSort(int[] data, int[] temp, int l, int r) { r"hogmFD;
int i, j, k; }{S pV
int mid = (l + r) / 2; ]m=2 $mK
if (l == r) q_b,3Tp
return; k.6gX<T
if ((mid - l) >= THRESHOLD) o/\f+iz7
mergeSort(data, temp, l, mid); 5)=YTUCk
else XNaiMpp'
insertSort(data, l, mid - l + 1); ><DXT nt'x
if ((r - mid) > THRESHOLD) u}(K3H3
mergeSort(data, temp, mid + 1, r); +6;1.5Tc
else 3q)y;T\yW
insertSort(data, mid + 1, r - mid); P/Zp3O H
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for (i = l; i <= mid; i++) { ,b'QL6>`
temp = data; )2&y;{]
} 64 83v'
for (j = 1; j <= r - mid; j++) { @3Nvf}He
temp[r - j + 1] = data[j + mid]; f}ES8Hh[
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int a = temp[l]; :p0<AU47
int b = temp[r]; 4iC=+YUn
for (i = l, j = r, k = l; k <= r; k++) { E%e2$KfD
if (a < b) { =LyRCrA
data[k] = temp[i++]; aQ#6PO7.Z
a = temp; {Q/_I@m].
} else { ( SiwO.TZ
data[k] = temp[j--]; 4<<T#oW.:G
b = temp[j]; RA
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} |S.;']t+
} jA,|.P>
} %Q. |qyq
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/** vcz?;lg
* @param data 0UN65JBuD
* @param l ]s>y se
* @param i K0-AP
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*/ 8I)}c1j`v
private void insertSort(int[] data, int start, int len) { a[hQ<@1O
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 8=DZ;]XD.
} `CqF&b
} LG:Mksd8=4
} CZ|h` ";P2
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}