归并排序: @ev^e!B
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package org.rut.util.algorithm.support; %;#9lkOXWH
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import org.rut.util.algorithm.SortUtil; OqX+R4S
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/** _zLEHEZ-
* @author treeroot .UU)
* @since 2006-2-2
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* @version 1.0 +A%zFF3
*/ *7qa]i^]
public class MergeSort implements SortUtil.Sort{ 3*R(&O6}
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/* (non-Javadoc) d;a"rq@a)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7o-}86x#
*/ J?Rp
public void sort(int[] data) { V/ZWyYxjLi
int[] temp=new int[data.length]; #+^l3hMK
mergeSort(data,temp,0,data.length-1); )5TX3#=;(G
} hDbZ62DDN
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private void mergeSort(int[] data,int[] temp,int l,int r){ |[!0ry*N%
int mid=(l+r)/2; xRF_'|e
if(l==r) return ; ?h8/\~Dw
mergeSort(data,temp,l,mid); yCv"(fNQ
mergeSort(data,temp,mid+1,r); FWo`oJeN
for(int i=l;i<=r;i++){ s%?<:9
temp=data; V{{UsEVO
} WX+@<y}%
int i1=l; t5QGXj
int i2=mid+1; M<@9di7c
for(int cur=l;cur<=r;cur++){ r?x~`C
if(i1==mid+1) z=LO$,JW`
data[cur]=temp[i2++]; /Wy9".
else if(i2>r) (; Zl
data[cur]=temp[i1++]; ltd'"J/r
else if(temp[i1] data[cur]=temp[i1++]; iz-O~T/^
else *}LQZFrnX
data[cur]=temp[i2++]; _K~?{".
} l> >BeZ
} os(}X(
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} -Q!?=JNtQ
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改进后的归并排序: Kw>gg
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package org.rut.util.algorithm.support; _xdttO^N
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import org.rut.util.algorithm.SortUtil; 73M;-qnU
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/** Q1
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* @author treeroot 6:\z8fYD
* @since 2006-2-2 [92bGR{
* @version 1.0 FRTvo
*/ !v 3wl0
public class ImprovedMergeSort implements SortUtil.Sort { 4 W+ nSv
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private static final int THRESHOLD = 10; g:"Hg-s
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/* *tT5Zt/&Sr
* (non-Javadoc) St1>J.k_
* c{f1_qXN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8\Eq(o}7
*/ 7M9s}b%?
public void sort(int[] data) { 3*b!]^d:D
int[] temp=new int[data.length]; &S#bLE
mergeSort(data,temp,0,data.length-1); ~K|o@LK
} %P]-wBJw
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private void mergeSort(int[] data, int[] temp, int l, int r) { ZP%Bu2xd
int i, j, k; NO)vk+
int mid = (l + r) / 2; ?/ s=E+
if (l == r) L G9#D
return; R7By=Y!t
if ((mid - l) >= THRESHOLD) F~O!J@4]
mergeSort(data, temp, l, mid); bRAf!<3
else NPR{g!tK%
insertSort(data, l, mid - l + 1); !!t@H\
if ((r - mid) > THRESHOLD) 7h/{F({r=
mergeSort(data, temp, mid + 1, r); o=(>#iVM
else [ \Aor[(
insertSort(data, mid + 1, r - mid); Z8Clm:S
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for (i = l; i <= mid; i++) { 3!B3C(g
temp = data; HjN )~<j
} 0b}lwo,|\
for (j = 1; j <= r - mid; j++) { O~&l.>??
temp[r - j + 1] = data[j + mid]; L:EJ+bNG
} *'(dcy9
int a = temp[l]; x9CI>l
int b = temp[r]; UJF
}Ye
for (i = l, j = r, k = l; k <= r; k++) { Web8"8eD
if (a < b) { !PrO~
data[k] = temp[i++]; L9U<E $%#
a = temp; WJL,L[XC
} else { r^6vo6^
data[k] = temp[j--]; P.1iuZ "w
b = temp[j]; &On0)G3Rc
} P^LOrLmo8
} j|WaWnl=
} P6 G/J-
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/** ]R{=|
* @param data 2=NYBOE
* @param l Q-&]Vg
* @param i M>k7
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*/ w02HSQ
private void insertSort(int[] data, int start, int len) { (;h]'I@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 5cQBqH]
} c#;LH5KI
} UwQ3q
} Vt4}!b(O
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}