归并排序: G>f-w F6
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package org.rut.util.algorithm.support; 9Y&,dBj+
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import org.rut.util.algorithm.SortUtil; zbn0)JO
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/** aGvD
* @author treeroot $[txZN
* @since 2006-2-2 IBm&a^
* @version 1.0 C=2"*>lTn
*/ "pTyQT9P
public class MergeSort implements SortUtil.Sort{ "Wd?U[[
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/* (non-Javadoc) tAH,3Sz( /
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d[;=X .fZ2
*/ )TV4OT#
public void sort(int[] data) { ma.yI};$
int[] temp=new int[data.length]; ;(M`Wy]2
mergeSort(data,temp,0,data.length-1); Z|+SC \Y
} [P`t8
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private void mergeSort(int[] data,int[] temp,int l,int r){ u1d{|fF
int mid=(l+r)/2; |Q2H^dU'rQ
if(l==r) return ; &z;F'>"
mergeSort(data,temp,l,mid); h7mJXS)t|
mergeSort(data,temp,mid+1,r); bAv>?Xqa
for(int i=l;i<=r;i++){ (@Q@B%!!K
temp=data; 3#vhQ*xU
} fhlhlOg
int i1=l; H@Dj$U
int i2=mid+1; ;,GE!9HW
for(int cur=l;cur<=r;cur++){ \2,7fy'
if(i1==mid+1) |NFX"wv:c<
data[cur]=temp[i2++]; >AIkkQT
else if(i2>r) ]v96Q/a
data[cur]=temp[i1++]; @4dB$QF`&
else if(temp[i1] data[cur]=temp[i1++]; odAeBQy
else rQgRD)_%w
data[cur]=temp[i2++]; 6+HpN"?e
} KrN#>do&<
} w8i"-SE
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} >(+g:p
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改进后的归并排序: V4p4m@z^u
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package org.rut.util.algorithm.support; 2lPj%i 5
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import org.rut.util.algorithm.SortUtil; Z"rrbN1
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/** |,rIB
* @author treeroot 7@"J&><w!
* @since 2006-2-2 !l1UpJp
* @version 1.0 ]h8[b9$<")
*/ 7Z;bUMYtx
public class ImprovedMergeSort implements SortUtil.Sort { F/;uN5{o
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private static final int THRESHOLD = 10; sp*_;h3'
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/* jeM % XI
* (non-Javadoc) n|5+HE4@
* |4NH}XVYJ>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d7Lna^
*/ O}\$E{-
public void sort(int[] data) { 8+m;zvDSU
int[] temp=new int[data.length]; =w='qjh
mergeSort(data,temp,0,data.length-1); L/,#:J
} Kc~h
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private void mergeSort(int[] data, int[] temp, int l, int r) { z$OKn#%T
int i, j, k; hhQLld4
int mid = (l + r) / 2; 6FuZMasr*
if (l == r) N3 qtq9{
return; ;A)w:"m
if ((mid - l) >= THRESHOLD) 3x2*K_A5:Q
mergeSort(data, temp, l, mid); 3>%oGbo
else 4kZX$ct}
insertSort(data, l, mid - l + 1); Z^w11}
if ((r - mid) > THRESHOLD) U6V+jD}L]
mergeSort(data, temp, mid + 1, r); ``bIqY
else 9A0wiKp
insertSort(data, mid + 1, r - mid); 'B&gr}@4O=
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for (i = l; i <= mid; i++) { ab4(?-'-
temp = data; D9`J||]E
} OL|_@Fv`A
for (j = 1; j <= r - mid; j++) { O^(ji8[l
temp[r - j + 1] = data[j + mid]; .: ~);9kj
} RL0,QC)e#@
int a = temp[l]; -Bymt[
int b = temp[r]; 2uw1R;zw
for (i = l, j = r, k = l; k <= r; k++) { 9&e=s<6dO
if (a < b) { {,z$*nf
data[k] = temp[i++]; w~EBm=v_>
a = temp; 1"k"<{%
} else { y7J2:/@[x
data[k] = temp[j--]; Dj!v+<b
b = temp[j]; CjRI!}S
} []R`h*#
} Yg_;Eu0'?
} 4E[ 9)n+YV
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/** W8hf
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* @param data y;W|)
* @param l *`D(drnT{
* @param i $*EK
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*/ d$~q
private void insertSort(int[] data, int start, int len) { \ci'Cbn\o
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); (3kz(6S
} 3(D!]ku~m
} KG:CVIW
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} Y]
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}