归并排序: !`q*{Ojx
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package org.rut.util.algorithm.support; ^wPKqu)^
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import org.rut.util.algorithm.SortUtil; nv1'iSEeOl
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/** J\<7M8
* @author treeroot 0* <gGC
* @since 2006-2-2 L@2%a'
* @version 1.0 MzT#1~
*/ \?c0XD
public class MergeSort implements SortUtil.Sort{ ^8$CpAK]M
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/* (non-Javadoc) Ni*f1[sI<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) mE(EyB<
*/ ^ j;HYs_
public void sort(int[] data) { 9PjL
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int[] temp=new int[data.length]; `<kHNcm
mergeSort(data,temp,0,data.length-1); <8Ek-aNNt
} xy>wA
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private void mergeSort(int[] data,int[] temp,int l,int r){ _5%SYxF*y
int mid=(l+r)/2; s,m+q)
if(l==r) return ; Yq}7x1mm
mergeSort(data,temp,l,mid); [H;HrwM
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mergeSort(data,temp,mid+1,r); JIvVbI
for(int i=l;i<=r;i++){ QLH&WF
temp=data; :' ?%%P
} h^^zR)EVb
int i1=l; 4[a?..X
int i2=mid+1; e`k6YO
for(int cur=l;cur<=r;cur++){ wH=
if(i1==mid+1) 4@OnMj{M
data[cur]=temp[i2++]; G7 >
else if(i2>r) rs{e6
data[cur]=temp[i1++]; A!Zjcp|
else if(temp[i1] data[cur]=temp[i1++]; `l@[8H%aw
else (oX|lPD<b
data[cur]=temp[i2++]; fx %Y(W#5
} 0#4_vg .
} I"Y d6M%
;
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} _a@&$NEox
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改进后的归并排序: @;kw6f:{d
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package org.rut.util.algorithm.support; V&vU her0
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import org.rut.util.algorithm.SortUtil; (Z5=GJM?$
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/** u':-DgK
* @author treeroot <HM\ZDo@P
* @since 2006-2-2 +jYO?uaT
* @version 1.0 )#k*K9[@
*/ =BQM(mal
public class ImprovedMergeSort implements SortUtil.Sort { $V-]DD%Y
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private static final int THRESHOLD = 10; r9z_8#cR
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/* }HtP8F8!x
* (non-Javadoc) kv&%$cA
* N
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a(Ka2;M4J
*/ [1B F8:
public void sort(int[] data) { J9S9rir&
int[] temp=new int[data.length]; D}'g4Ag
mergeSort(data,temp,0,data.length-1); mj5$ 2J
} jm&?;~>O
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private void mergeSort(int[] data, int[] temp, int l, int r) { <_@ K4zV
int i, j, k; 6}
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int mid = (l + r) / 2; 2A|^6#XN'
if (l == r) *6 -;iT8
return; 6la# 0U23
if ((mid - l) >= THRESHOLD)
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mergeSort(data, temp, l, mid); +*'
else J XKps#,(#
insertSort(data, l, mid - l + 1); loN!&YceW
if ((r - mid) > THRESHOLD) (1JZuR<?c
mergeSort(data, temp, mid + 1, r); z1}YoCj1
else %HSS
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insertSort(data, mid + 1, r - mid); iz]Vb{5n%
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for (i = l; i <= mid; i++) { k1Zu&4C\
temp = data; hnZI{2XzBE
} c'OJodpa
for (j = 1; j <= r - mid; j++) { vR`-iRQ?_
temp[r - j + 1] = data[j + mid]; &&$/>[0=.
} zrk/}b0j
int a = temp[l]; !e@G[%k
int b = temp[r]; rubqk4
for (i = l, j = r, k = l; k <= r; k++) { a
OR}
if (a < b) { I8HUH*|)n
data[k] = temp[i++]; {:m5<6?x)
a = temp; ?GqFtNz
} else { uA=6 HpDB
data[k] = temp[j--]; oc'#sE
b = temp[j]; HRIf)n&~f
} *V#v6r7<Y/
} G}ElQD
} |57KTiiNLI
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/** >0)E\_ u
* @param data q)gZo[]~
* @param l wpu]{~Y
* @param i 2!>phE
*/ &:=
private void insertSort(int[] data, int start, int len) { zYpIG8"o5
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); o O%!P<