归并排序: T r0B[QF
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package org.rut.util.algorithm.support; T~_/Vi
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import org.rut.util.algorithm.SortUtil; CQh,~
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/** fw6UhG
* @author treeroot /FP5`:PfL
* @since 2006-2-2 ]X Z-o>+,
* @version 1.0 %zk$}}ti.
*/ Y!J>U
public class MergeSort implements SortUtil.Sort{ ?>"Yr,b?
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/* (non-Javadoc) f"1>bW>R+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *3/T;x.
*/ ]n."<qxeT
public void sort(int[] data) { ::FS/Y]Fg
int[] temp=new int[data.length]; mtz#}qD66
mergeSort(data,temp,0,data.length-1); PjA6Ji;Hu
} -#!x|ne
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private void mergeSort(int[] data,int[] temp,int l,int r){
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int mid=(l+r)/2; 9}a_:hAy/
if(l==r) return ; O3DmNq$dz
mergeSort(data,temp,l,mid); a2Pf/D]n
mergeSort(data,temp,mid+1,r); ,JU@|`
for(int i=l;i<=r;i++){ +l3=3
temp=data; Bw%Qbs0Q
} n_ lo`
int i1=l; LJk%#yV|_
int i2=mid+1; %1}K""/
for(int cur=l;cur<=r;cur++){ D(-yjY8aG
if(i1==mid+1) 4SPy28<f
data[cur]=temp[i2++]; o*U]v
else if(i2>r) s*U1
data[cur]=temp[i1++]; $un?0S
else if(temp[i1] data[cur]=temp[i1++]; `Qr%+OD
else
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data[cur]=temp[i2++]; e@:sR
} _4^R9Bt
} AKMm&(fh%
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} nWQ;9_qBB
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改进后的归并排序: `W/sP\3
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package org.rut.util.algorithm.support; 7$h#OV*@,
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import org.rut.util.algorithm.SortUtil; 3gd&i
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/** -'~LjA(
* @author treeroot <! )**
* @since 2006-2-2 S26MDLk`R3
* @version 1.0 ~/.7l8)
*/ Vz6Qxd{m3
public class ImprovedMergeSort implements SortUtil.Sort { aaD;jxT&M|
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private static final int THRESHOLD = 10; S[WG$
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/* e[hcJz!D
* (non-Javadoc) Yn8=
* C z\Pp q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~ vqa7~}m
*/ R<OI1,..r
public void sort(int[] data) { sc,Xw:YO
int[] temp=new int[data.length]; (}}S9 K
mergeSort(data,temp,0,data.length-1); W`c'=c
} E[Cb|E
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private void mergeSort(int[] data, int[] temp, int l, int r) { jH_JmYd
int i, j, k; BcI|:qv|
int mid = (l + r) / 2; xyI}y(CN1
if (l == r) /7gOSwY
return; q$=#A7H>3)
if ((mid - l) >= THRESHOLD) ?lP':'P
mergeSort(data, temp, l, mid); E*+{t~
else %2v4<icvq
insertSort(data, l, mid - l + 1); ,\NFt`]j
if ((r - mid) > THRESHOLD) lok=
mergeSort(data, temp, mid + 1, r); \L"kV!>
else =UV`.d2[
insertSort(data, mid + 1, r - mid); u*hSj)vr1
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for (i = l; i <= mid; i++) { !"Oh36
temp = data; qgfi\/$6
} o"*AtGR+"
for (j = 1; j <= r - mid; j++) { YpqrZWvh
temp[r - j + 1] = data[j + mid]; =ZqT3_
} wiiCd
int a = temp[l]; ti#7(^j
int b = temp[r]; -\C!I
for (i = l, j = r, k = l; k <= r; k++) { AvW:<}a,
if (a < b) { 2k=#om19
data[k] = temp[i++]; Qjb:WC7he
a = temp; <i,U )Tt^C
} else { )==Jfn y
data[k] = temp[j--]; #'y#"cmQ.
b = temp[j]; Mxv;k%l|E|
} N0r16# -g
} kBffF@{
} j:VbrR
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/** *6VF
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* @param data d QqK^#
* @param l Oeok; :
* @param i `^)jLuyu
*/ /HaHH.e
private void insertSort(int[] data, int start, int len) { vd[0X;
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); `E>1>'
} Ig
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} "yS _s
} P}4QQw
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}