归并排序: U3|&Jee
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package org.rut.util.algorithm.support; mb~=Xyk&
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import org.rut.util.algorithm.SortUtil; ahi57r[
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/** !8" $d_=h
* @author treeroot JX\T
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* @since 2006-2-2 10l1a4
* @version 1.0 H6PXx
*/ kO,VayjT
public class MergeSort implements SortUtil.Sort{ wUIsi<Oj
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/* (non-Javadoc) 9?l?G GmQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \{MrQ2jd
*/ v-7Rb)EP
public void sort(int[] data) { B
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int[] temp=new int[data.length]; msqxPC^I
mergeSort(data,temp,0,data.length-1); A"bSNHCKF
} ]2xx+P#Y
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private void mergeSort(int[] data,int[] temp,int l,int r){ LE0J ;|1
int mid=(l+r)/2; k qY3r &
if(l==r) return ; 7k`*u) Q
mergeSort(data,temp,l,mid); mOz&6T<|
mergeSort(data,temp,mid+1,r); p'%: M
for(int i=l;i<=r;i++){ V$Xl^# tN
temp=data; Ah" 'hFY
} 9#EHXgz
int i1=l; _86*.3fQG
int i2=mid+1; S-M)MCL
for(int cur=l;cur<=r;cur++){ !}L~@[v,uL
if(i1==mid+1) aX[1H6&=7
data[cur]=temp[i2++]; x'=3&vc4
else if(i2>r) oXQ<9t1(
data[cur]=temp[i1++]; x#:BE
else if(temp[i1] data[cur]=temp[i1++]; M ~ i+F0
else Q2[prrk%j
data[cur]=temp[i2++]; k binf
} :p\(y
} /+x#V!zM
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改进后的归并排序: 'd2qa`H'}B
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package org.rut.util.algorithm.support; %EJ\|@N:
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import org.rut.util.algorithm.SortUtil; c4ZuW_&:
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/** !sfXq"F
* @author treeroot 8z."X$
* @since 2006-2-2 O ':0V
* @version 1.0 $TD~k;
*/ =.qm8+
public class ImprovedMergeSort implements SortUtil.Sort { 9k=U0]!ch
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private static final int THRESHOLD = 10; v.l7Q
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/* w'oo-.k
* (non-Javadoc) B.}_],
* bVa+kYE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) c%AFo]H
*/ t
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public void sort(int[] data) { S1 EEASr!}
int[] temp=new int[data.length]; [5?4c'Ev
mergeSort(data,temp,0,data.length-1); Q)LXL.0h
} tb:,Uf>E
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private void mergeSort(int[] data, int[] temp, int l, int r) { E-yT
int i, j, k; O6m.t%*
int mid = (l + r) / 2; ~7lTqY\
if (l == r) yqC Q24
return; e-CNQnO~
if ((mid - l) >= THRESHOLD) X$7Oo^1;
mergeSort(data, temp, l, mid); ,67"C2Y
else (~j,mk
insertSort(data, l, mid - l + 1); fBf4]^
if ((r - mid) > THRESHOLD) 74@lo-/LY
mergeSort(data, temp, mid + 1, r); X(Y#9N"
else P"(z jG9-
insertSort(data, mid + 1, r - mid); 3I9T|wQ-]
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for (i = l; i <= mid; i++) { oUJj5iu}
temp = data; }}^,7npU
} +Dx1/I
for (j = 1; j <= r - mid; j++) {
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temp[r - j + 1] = data[j + mid]; S=0"f}Jo.
} \H Wcd|
int a = temp[l]; EJf #f
int b = temp[r]; DA<F{n.Z:
for (i = l, j = r, k = l; k <= r; k++) { YSR mt/
if (a < b) { !_CX2|
data[k] = temp[i++]; Awu$g.
a = temp; S~@r
} else { {]wIM^$6+
data[k] = temp[j--]; O1GDugZ
b = temp[j]; r\$6'+Si
} _iG2J&1'L
} tigT@!`$Y
} J>rka]*
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/** -PNi^
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* @param data )y9 ;OA
* @param l wP[xmO-%
* @param i NH7`5mF$
*/ FJP< bREQ
private void insertSort(int[] data, int start, int len) { ^4c,U9J=
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 0U$:>bQ
} 8F#osN
} 63W{U/*aao
} bGbqfO`
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}