归并排序: 4^*+G]]wZ~
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package org.rut.util.algorithm.support; pAdx 6
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import org.rut.util.algorithm.SortUtil; -!Ov{GHr0
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/** dMw7UJ
* @author treeroot Ec2?'*s
* @since 2006-2-2 :X+!W_xR
* @version 1.0
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*/ #/"?.Z;SSH
public class MergeSort implements SortUtil.Sort{ )h0
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/* (non-Javadoc) $0[t<4K`yn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _|^cudRv
*/ ,M?K3lG\g[
public void sort(int[] data) { *OM+d$l!
int[] temp=new int[data.length]; OdSglB
mergeSort(data,temp,0,data.length-1); 8bTE#2+-
} vyS8yJUY
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private void mergeSort(int[] data,int[] temp,int l,int r){ Al}D~6MD
int mid=(l+r)/2; Sv#S_jh
if(l==r) return ; b=$(`y
mergeSort(data,temp,l,mid); lEXER^6
mergeSort(data,temp,mid+1,r); Mp-hNO}.Z
for(int i=l;i<=r;i++){ Q0j4c
temp=data; Crg@05Z
} vRI0fDu
int i1=l; !pJd^|4A]
int i2=mid+1; ?"@`SEdnU2
for(int cur=l;cur<=r;cur++){ ]=Tle&yM+T
if(i1==mid+1) aGz$A15#
data[cur]=temp[i2++]; tS[@3h
else if(i2>r) |#i|BVnoE
data[cur]=temp[i1++]; <>71;%e;'
else if(temp[i1] data[cur]=temp[i1++]; +eUWf{(_
else Bx" eX>A8
data[cur]=temp[i2++]; (qyT,K8
} u%24%
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} Rlwewxmr
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}
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改进后的归并排序: (8Inf_59
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package org.rut.util.algorithm.support; -]~KQvIH!
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import org.rut.util.algorithm.SortUtil; -\I".8"YE
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/** VKb=)v[K
* @author treeroot !kQJ6U
* @since 2006-2-2 )RCva3Ul
* @version 1.0 yM
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*/ zd0[f3~
public class ImprovedMergeSort implements SortUtil.Sort { 38zG[c|X
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private static final int THRESHOLD = 10; GNX`~%3KYc
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/* L "[>tY
* (non-Javadoc) 3uy^o
* W*WSjuFr2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J#) %{k_
*/ X%R )
public void sort(int[] data) { ^3O`8o
int[] temp=new int[data.length]; 4?',E ddo
mergeSort(data,temp,0,data.length-1); V2oXg
} Xaw&41K
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private void mergeSort(int[] data, int[] temp, int l, int r) { (Kg( 6E,
int i, j, k; 6|10OTVu`
int mid = (l + r) / 2; c[zGWF#1>
if (l == r) w|[{xn^R
return; LXq0hI
if ((mid - l) >= THRESHOLD) S4C4_*~Vd
mergeSort(data, temp, l, mid); njGZ#{"eC
else \J-}Dp\0b
insertSort(data, l, mid - l + 1); ]yV,lp
if ((r - mid) > THRESHOLD) Y+Cqc.JBQ
mergeSort(data, temp, mid + 1, r); WT '?L{
else j`l'Mg
insertSort(data, mid + 1, r - mid); <tI_u ~P
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for (i = l; i <= mid; i++) { QdK
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temp = data; )\m%&EXG{
} La8 D%N
for (j = 1; j <= r - mid; j++) { YgR}y+q^6
temp[r - j + 1] = data[j + mid]; !V27ln KP+
} DTN)#GCtF
int a = temp[l]; f\X7h6k8{
int b = temp[r]; EHH+)mlo
for (i = l, j = r, k = l; k <= r; k++) { e3=-7FU
if (a < b) { P;V5f8r?
data[k] = temp[i++]; r}M2t$nv
a = temp; 9?I?;l{
} else {
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data[k] = temp[j--]; &'"dYZj{
b = temp[j]; CT[CM+
} (Y~gItej
} FB }8
} 8Y
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/** d 6=Z=4w
* @param data a"!r]=r
* @param l +L-(Lz[p
* @param i !)HB+yr
*/ a~wlD.P
private void insertSort(int[] data, int start, int len) { 0NMmN_Lr
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]EfM;'j[
} 9/dI 6 P7
} |*y'H*
} O`TM}
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}