归并排序: D@X+{
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package org.rut.util.algorithm.support; 8dK0o>|}
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import org.rut.util.algorithm.SortUtil; YwH./)r=
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/** ;3C:%!CdA]
* @author treeroot +rWZ|&r%
* @since 2006-2-2 Kt#,]]
* @version 1.0 a <X0e>
*/ 6k?`:QK/sl
public class MergeSort implements SortUtil.Sort{ 7m5Co>NkuK
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/* (non-Javadoc) + E"[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) uHNpfKnZ
*/ 6ri\>QrF
public void sort(int[] data) { <@bA?FY
int[] temp=new int[data.length]; ep(g`e
mergeSort(data,temp,0,data.length-1); P,bd'
} !.fw,!}hOD
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private void mergeSort(int[] data,int[] temp,int l,int r){ K
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int mid=(l+r)/2; #l1Q e`
if(l==r) return ; ZEbLL4n
mergeSort(data,temp,l,mid); pw'wWZE'
mergeSort(data,temp,mid+1,r); }1+%_|Y-E
for(int i=l;i<=r;i++){ |)_-Bi;MW`
temp=data; 9>,Qgp,w
} 4}KU>9YRA
int i1=l; yZ}d+7T}
int i2=mid+1; o4=Yu7L
for(int cur=l;cur<=r;cur++){ FquFRx
if(i1==mid+1) MmU%%2QG
data[cur]=temp[i2++]; .gZZCf&?
else if(i2>r) C>|@& o1
data[cur]=temp[i1++]; e9u@`ZC07
else if(temp[i1] data[cur]=temp[i1++]; $R{8z-,Q
else <xS=#
data[cur]=temp[i2++]; UCqs}U8
} zXc}W*ymj
} 9EF~l9`'U
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改进后的归并排序: &A50'8B2A
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package org.rut.util.algorithm.support; nbvkP
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import org.rut.util.algorithm.SortUtil; 9Yw]Y5l
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/** W$\X ~Q'0
* @author treeroot $T
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* @since 2006-2-2
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* @version 1.0 6GOcI#C9C
*/ K%,$ V,#
public class ImprovedMergeSort implements SortUtil.Sort { Qd8b-hg
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private static final int THRESHOLD = 10; ~mILA->F
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/* c"Y!$'|Q
* (non-Javadoc) 8@7AE"
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y' tRANxQ
*/ kP,7Li\
public void sort(int[] data) { 0U&dq#
int[] temp=new int[data.length]; F ! )-|n}
mergeSort(data,temp,0,data.length-1); ,hE/II`-d'
} 2bA#D%PHD
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private void mergeSort(int[] data, int[] temp, int l, int r) { 0o68rF5^s
int i, j, k; Ku%6$C!,
int mid = (l + r) / 2; SgSk!lj
if (l == r) /e 5\ 9
return; Tt6{WDscZ
if ((mid - l) >= THRESHOLD) ic~Z_?p
mergeSort(data, temp, l, mid); Wu{&;$
else *h,3}\
insertSort(data, l, mid - l + 1); (
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if ((r - mid) > THRESHOLD) :` <psvd
mergeSort(data, temp, mid + 1, r); :,C%01bH|l
else /VtlG+dLl
insertSort(data, mid + 1, r - mid); ^('cbl
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for (i = l; i <= mid; i++) { Nu.
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temp = data; Es:6
} !1-&Y'+
for (j = 1; j <= r - mid; j++) { /oDpgOn
temp[r - j + 1] = data[j + mid]; Q eK{MF
} h3t$>vs2F"
int a = temp[l]; |LFUzq>j
int b = temp[r]; RO(iHR3cA
for (i = l, j = r, k = l; k <= r; k++) { Y2vj}9jK
if (a < b) { ^n71'MW
data[k] = temp[i++]; QE6El'S
a = temp; ]|BojSL_
} else { _>Ln@
data[k] = temp[j--]; _@|fva&s,;
b = temp[j]; ,9UCb$mh
} U 1F-~{r
} 4@))OD^ x
} a8NVLD>7}
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/** 9i[4"&K
* @param data d"!yD/RD
* @param l x.G"D(
* @param i V@Kn24''
*/ 2|s<[V3rP-
private void insertSort(int[] data, int start, int len) { AI R{s7N
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y*(_\\
} xtsL8-u f
} '2wCP
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} Xvq^1Y?
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}