归并排序: 3;7q`
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package org.rut.util.algorithm.support; @)>D))+
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import org.rut.util.algorithm.SortUtil; ESg+n(R
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/** 3IR
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* @author treeroot /({;0I*!i
* @since 2006-2-2 B_ja&) !s1
* @version 1.0 `^(jm
*/ nx:KoB"ny
public class MergeSort implements SortUtil.Sort{ FP#FB$eP
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/* (non-Javadoc) !)qQbk
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e8h,,:l3j
*/ '~ 4pl0TWc
public void sort(int[] data) { dI*'!wK
int[] temp=new int[data.length]; DY{cQb
mergeSort(data,temp,0,data.length-1); e,k2vp!<&
} /<&h@$NHH4
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private void mergeSort(int[] data,int[] temp,int l,int r){ 1^dJg8
int mid=(l+r)/2; _TUt9}
if(l==r) return ; $&Kq*m 0g
mergeSort(data,temp,l,mid); kvGCbRC
mergeSort(data,temp,mid+1,r); 'r} zY-FM`
for(int i=l;i<=r;i++){ 3L_I[T$s
temp=data; TwvAj#j
} a=xT(G0Re
int i1=l; pilh@#_h
int i2=mid+1; EPX8Wwf
for(int cur=l;cur<=r;cur++){ H@l}[hkP
if(i1==mid+1) F_ 7H!F
data[cur]=temp[i2++]; 8ga_pNe
else if(i2>r) \OC6M` /
data[cur]=temp[i1++]; pO~c<d}b
else if(temp[i1] data[cur]=temp[i1++]; .>Z,uT^A
else r7]"?#
data[cur]=temp[i2++]; mxFn7.|r~
} =q(GHg;'
} 'R9g7,53R
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} J^m<*
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改进后的归并排序: ~vgA7E/XV
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package org.rut.util.algorithm.support; /}5B&TZ=(3
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import org.rut.util.algorithm.SortUtil; V5D2\n3A
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/** K{cbn1\,H
* @author treeroot cPn+<M#
* @since 2006-2-2 ,>LRa
* @version 1.0 la$%H<,7
*/ MS<SAD>w
public class ImprovedMergeSort implements SortUtil.Sort { =l942p
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private static final int THRESHOLD = 10; rrs"N3!aT
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/* ekQrW%\3
* (non-Javadoc) U5/qf8)yO
* 8cm@a*2%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "DSPPE&[c
*/ 5V-jMB
public void sort(int[] data) { $R^AEa7
int[] temp=new int[data.length]; Q;h3v1GC\P
mergeSort(data,temp,0,data.length-1); |@j_2Q,
} +&ZX$
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private void mergeSort(int[] data, int[] temp, int l, int r) { >O]s&34
int i, j, k; :a3LS|W
int mid = (l + r) / 2; )%Y
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if (l == r) Di=9mHC
return; beZ(o?uK
if ((mid - l) >= THRESHOLD) UQd6/mD`e
mergeSort(data, temp, l, mid); O.k\]'
else zuL7%qyv
insertSort(data, l, mid - l + 1); 0y%L-:/c|
if ((r - mid) > THRESHOLD) *]s&8/Gmb
mergeSort(data, temp, mid + 1, r); ';RI7)<
else #Ogt(5Sd
insertSort(data, mid + 1, r - mid); . p^xS6e{
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for (i = l; i <= mid; i++) { ~U}Mv{y
temp = data; noA-)
} .Gb+\E{M
for (j = 1; j <= r - mid; j++) { *j*Du+
temp[r - j + 1] = data[j + mid]; 0jB X5
} +nZRi3yu=
int a = temp[l]; iRV;Fks
int b = temp[r]; &1)xoZ'\
for (i = l, j = r, k = l; k <= r; k++) { h(xP_Svj>
if (a < b) { .
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data[k] = temp[i++]; <9@7,2
a = temp;
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} else { 0^_MN~s(X
data[k] = temp[j--]; C|z%P}u#p
b = temp[j]; [{F%LRCo-
} K6pw8
} V 2kWiyN
} EIX\O6*
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/** oL
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* @param data a0d
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* @param l \3{3ly~L
* @param i c<qe[iyt/
*/ TGWdyIk
private void insertSort(int[] data, int start, int len) { N&;\PfG
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ++92:decM
} Uh6mGLz*&
} gM_:l
} {HZS:AV0
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}