归并排序: pt?bWyKG
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package org.rut.util.algorithm.support; )',R[|<
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import org.rut.util.algorithm.SortUtil; @?ebuj5{e
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/** zg>zUe
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* @author treeroot SV4E0c>
* @since 2006-2-2 C-xr"]#]
* @version 1.0 v{RZJ^1
*/ #{0HYg?(f
public class MergeSort implements SortUtil.Sort{ W@>% {eE
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/* (non-Javadoc) sVQ|*0(J0r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bt SRtf
*/ \eTwXe]Pv
public void sort(int[] data) { Fk7?xc
int[] temp=new int[data.length]; "> ypIR<
mergeSort(data,temp,0,data.length-1); _!#@@O0p/h
} =<C:d
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private void mergeSort(int[] data,int[] temp,int l,int r){ 50h!
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int mid=(l+r)/2; 3F"lXguS
if(l==r) return ; v@sIHb
mergeSort(data,temp,l,mid); qfF~D0}
mergeSort(data,temp,mid+1,r); D'>_I.
for(int i=l;i<=r;i++){ cbjs9bu
temp=data; f^3*)Ni
} Xc++b|k
int i1=l; #&+{mCjs
int i2=mid+1; l03B=$
for(int cur=l;cur<=r;cur++){ 2F[ q).
if(i1==mid+1) hwuiu*
data[cur]=temp[i2++]; ]Ee?6]bN
else if(i2>r) VO5#Qg en
data[cur]=temp[i1++]; ^^u5*n+5
else if(temp[i1] data[cur]=temp[i1++]; y
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else _{ue8kGt
data[cur]=temp[i2++]; ,O5NLg-
} ~i= _J3'
} \0gis#
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} t3WiomNCc
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改进后的归并排序: ;._
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package org.rut.util.algorithm.support; E,Z$pKL?
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import org.rut.util.algorithm.SortUtil; q_lKKzA
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/** ux-/>enc
* @author treeroot umBICC]CU
* @since 2006-2-2 W ~<^L\Lu
* @version 1.0 y8y5*e~A-)
*/ iO$8:mxm0?
public class ImprovedMergeSort implements SortUtil.Sort { Cl.x'v
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private static final int THRESHOLD = 10; sfH_5
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/* Oamg]ST
* (non-Javadoc) wVXS%4|v
* &<g|gsG`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f^ZRT@`O
*/ &;6`)M{*}
public void sort(int[] data) { 1UgEI"#a6g
int[] temp=new int[data.length]; `cn#B
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mergeSort(data,temp,0,data.length-1); 2ACCh4(/P
} k8yEdi`
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private void mergeSort(int[] data, int[] temp, int l, int r) { Ufj`euY
int i, j, k; ,^r9n[M4M
int mid = (l + r) / 2; KM0ru
if (l == r) wo}H'Q}Hj
return; QhFVxCA
if ((mid - l) >= THRESHOLD) .<?GS{6
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mergeSort(data, temp, l, mid); CT@ jZtg0
else 8,Z_{R#|
insertSort(data, l, mid - l + 1); ;a!S!%.h
if ((r - mid) > THRESHOLD) Rh2+=N<X
mergeSort(data, temp, mid + 1, r); OKZV{Gja
else fm%t^)E
insertSort(data, mid + 1, r - mid); A|[?#S((]
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for (i = l; i <= mid; i++) { eeg)N1\
temp = data; fb7; |LF
} )* : gqN
for (j = 1; j <= r - mid; j++) { ]#<4vl\
temp[r - j + 1] = data[j + mid]; ]EbM9Fo-U
} K g*Q
int a = temp[l]; eIF5ZPSZi
int b = temp[r]; ?,Xw[pR
for (i = l, j = r, k = l; k <= r; k++) { ;O5zUl-`
if (a < b) { y1 DL,%j
data[k] = temp[i++]; B
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a = temp; + 480 l}
} else { , pfG
data[k] = temp[j--]; )m+W
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b = temp[j]; bP#:Oi0v`
} NYUL:Tp
} v"$L702d$\
} 7"D",1h
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/** (Rh,,
* @param data 2"Q|+-Io
* @param l /N+dQe
* @param i @7c?xQVd$
*/ 6v!`1}
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private void insertSort(int[] data, int start, int len) { s[*rzoA
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 539>WyG5
} Es`Px_k
} s)t@ol
} M?49TOQA
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}