归并排序: ZH1W#dt`[
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package org.rut.util.algorithm.support; f%g^6[
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import org.rut.util.algorithm.SortUtil; @W|N1,sp
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/** %k"qpu
* @author treeroot sOf;I]E|
* @since 2006-2-2 @)IHd6 R
* @version 1.0 ='\Di '*
*/ ,Fv8&tR
public class MergeSort implements SortUtil.Sort{
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/* (non-Javadoc) 1KI,/ H"SY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Sc?UjEs
*/ O'WBO"
public void sort(int[] data) { /A4^l]H;+3
int[] temp=new int[data.length]; T'K6Q cu
mergeSort(data,temp,0,data.length-1); fqY;>Z
} rgK:ujzW!
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private void mergeSort(int[] data,int[] temp,int l,int r){ P<OSm*;U:
int mid=(l+r)/2; >QcIrq%=
if(l==r) return ; qs|{
mergeSort(data,temp,l,mid); L3@upb
mergeSort(data,temp,mid+1,r); V~~4<?=A
for(int i=l;i<=r;i++){ l_MF9.z&
temp=data; 45qSt2
} Nr(t5TP^
int i1=l; Dus [N<
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int i2=mid+1; ;/79tlwq
for(int cur=l;cur<=r;cur++){ jfOqE*frl!
if(i1==mid+1) `zw^ WbCO{
data[cur]=temp[i2++]; C@ns`Eh8w
else if(i2>r) ElK7jWJ+
data[cur]=temp[i1++]; d'okXCG
else if(temp[i1] data[cur]=temp[i1++]; lR8Lfa*/7
else aQTISX;
data[cur]=temp[i2++]; dln1JZ!
} K8?]&.!
} xis],.N
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} *%#Sa~iPo
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改进后的归并排序: VUF$,F9
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package org.rut.util.algorithm.support; j]X$7
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import org.rut.util.algorithm.SortUtil; Ig{
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/** O'L9 s>B
* @author treeroot vhz[ H
* @since 2006-2-2 >69- [#P!
* @version 1.0 tF&g3)D:NV
*/ S5(VdMd"^
public class ImprovedMergeSort implements SortUtil.Sort { }QzF.![~z
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private static final int THRESHOLD = 10; *)|EWT?,
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/* jY|fP!?[
* (non-Javadoc) -L6YLe%w
* W-8U~*/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }Tz<fd/
*/ qH9bo-6
public void sort(int[] data) { ,|lDR@
int[] temp=new int[data.length]; l =X6m(
mergeSort(data,temp,0,data.length-1); /T\'&s3D+
} z:p;Wm
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private void mergeSort(int[] data, int[] temp, int l, int r) { T4fVZd)x
int i, j, k; 50='>|b
int mid = (l + r) / 2; Q?xCb
if (l == r) ^Q9;ro*;ck
return; Wq"5-U;:w
if ((mid - l) >= THRESHOLD) (l_/ HQ32
mergeSort(data, temp, l, mid); "+sl(A3`U
else Z.$)# vM5
insertSort(data, l, mid - l + 1); l RM7s(^l
if ((r - mid) > THRESHOLD) EU,f;H
mergeSort(data, temp, mid + 1, r); /YrBnccqD
else
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insertSort(data, mid + 1, r - mid); +aoenUm5
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for (i = l; i <= mid; i++) { ;QS(`SK l
temp = data; U'oFW@Y;h
} ~bnyk%S
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for (j = 1; j <= r - mid; j++) { tE(_Cg
temp[r - j + 1] = data[j + mid]; 2qgm(jo *y
} }|9!|Q
int a = temp[l]; 3X:)r<
int b = temp[r]; 7)zF8V
for (i = l, j = r, k = l; k <= r; k++) { 9=5xt;mEs}
if (a < b) { Ej#pM.
data[k] = temp[i++]; {Q~HMe`,
a = temp; De^Uc
} else { $GJuS^@%
data[k] = temp[j--]; 3`+Bq+
b = temp[j]; s%/x3anz=
} Gv\:Agi
} ;%a
} );!IGcgF
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/** ; nc3O{rU
* @param data N_liKhq
* @param l #<o=W#[
* @param i 8$~^-_>n/
*/ ojG;[@V
private void insertSort(int[] data, int start, int len) { DcRvZH
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); von<I
} zXZXp~7)
} {g7~e{2
} +[B@83
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}