归并排序: {u.V8%8
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package org.rut.util.algorithm.support; @LL&ggV?
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import org.rut.util.algorithm.SortUtil; : 6>H\
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/** <YeF?$S}
* @author treeroot 1~ SY
* @since 2006-2-2 &{]%=stI
* @version 1.0 @L<[38
*/ FOk @W&
public class MergeSort implements SortUtil.Sort{ U*&ZQw
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/* (non-Javadoc) M@'V4oUz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }=;>T)QmMO
*/ : l>Ue&
public void sort(int[] data) { uAvs
int[] temp=new int[data.length]; mLkZ4OZ
mergeSort(data,temp,0,data.length-1); z)VIbEy
} "]_|c\98
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private void mergeSort(int[] data,int[] temp,int l,int r){ "DlCvjc
int mid=(l+r)/2; @eTsS%f2
if(l==r) return ; Ar<OP'C
mergeSort(data,temp,l,mid); 6ZG)`u".("
mergeSort(data,temp,mid+1,r); owMH
for(int i=l;i<=r;i++){ @6j*XF
temp=data; #>v7"
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} pz&=5F
int i1=l; jujx3rnK?
int i2=mid+1; y{<#pS.
for(int cur=l;cur<=r;cur++){ xeI ,Kz."
if(i1==mid+1) ,K9UT#h
data[cur]=temp[i2++]; `C*!de]Y%
else if(i2>r) f<w*l<@
data[cur]=temp[i1++]; VNYLps@4H
else if(temp[i1] data[cur]=temp[i1++]; <Y#R]gf1
else !GIsmqVY
data[cur]=temp[i2++]; sRZ:9de+
} Y;Ur8q
} ,{Ab=xV
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} wFJK!9KA8
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改进后的归并排序: \9}5}X_x.
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package org.rut.util.algorithm.support; I)Lb"
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import org.rut.util.algorithm.SortUtil; ltrSTH,kL
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/** o(``7A@7a
* @author treeroot $0*47+f
* @since 2006-2-2 ZWa#}VS}-n
* @version 1.0 6g"<i}_|
*/ _#4,&bh8
public class ImprovedMergeSort implements SortUtil.Sort { <!N;(nZ9}O
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private static final int THRESHOLD = 10; GiZ'IDV
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/* =|!~0O
* (non-Javadoc) |d5L
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* "?{yVu~9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^d9raYE`'
*/ Dq?HUb^X
public void sort(int[] data) { be/1-=m
int[] temp=new int[data.length]; 3b3cNYP
mergeSort(data,temp,0,data.length-1); ee_\_"
} k@aP&Z~
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private void mergeSort(int[] data, int[] temp, int l, int r) { GnOo+hB
int i, j, k; X{xJ*T y'
int mid = (l + r) / 2; J\so8uT:
if (l == r) ]2%P``Yj
return; w)eQ'6Vu
if ((mid - l) >= THRESHOLD) />[6uvy#Q
mergeSort(data, temp, l, mid); 'Xl>,\'6
else %gMpV
insertSort(data, l, mid - l + 1); I=%sDn
if ((r - mid) > THRESHOLD) Zax]i,Bx
mergeSort(data, temp, mid + 1, r); otVyuh
else Kg`x9._2
insertSort(data, mid + 1, r - mid); b<(UmRxx3
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for (i = l; i <= mid; i++) { ^Ai_/! "
temp = data; '<=MhNh\
} lq8ko@
for (j = 1; j <= r - mid; j++) { *6D%mrK
temp[r - j + 1] = data[j + mid]; V&oT':%q
} K2rS[Kdfaq
int a = temp[l]; ;v+uv f
int b = temp[r]; f5GR#3-h(
for (i = l, j = r, k = l; k <= r; k++) { ,N7l/6
if (a < b) { SfobzX}~Jh
data[k] = temp[i++]; `/JR}g{O
a = temp; LEngZ~sV/
} else { 06@0r
data[k] = temp[j--]; R,w54},
b = temp[j]; T :S{3
} uP=_-ZUW
} e3={$A h
} =@KY A(D
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/** lcT+$4zk.
* @param data TnBG MI,g'
* @param l ]<;i}n|
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* @param i WUWb5xA
*/ Rf(x^J{
private void insertSort(int[] data, int start, int len) { @
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ~:}XVt0%8
} qv*uM0G6i
} 4fu\3A&
} ~sHZh
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}