归并排序: K(@QKRZ7[
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package org.rut.util.algorithm.support; 1henQiIO
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import org.rut.util.algorithm.SortUtil; E^B*:w3
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/** GO0Spf_Gh
* @author treeroot {uH
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* @since 2006-2-2 j}$dYbf$
* @version 1.0 B w?Kb@
*/ x}o]R
public class MergeSort implements SortUtil.Sort{ l}odW
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/* (non-Javadoc) a Mp*Ap
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B^g+_;
*/ banie{ e
public void sort(int[] data) { G%0G$3W"
int[] temp=new int[data.length]; H^_]' ~.
mergeSort(data,temp,0,data.length-1); rw_T&>!
} E)z[@Np
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private void mergeSort(int[] data,int[] temp,int l,int r){ =qPk'n9i8
int mid=(l+r)/2; Q -;ltJ
if(l==r) return ; N5 ITb0Tv
mergeSort(data,temp,l,mid); }%LwaRT
mergeSort(data,temp,mid+1,r); (}E-+:vFU
for(int i=l;i<=r;i++){ uX_A4ht*
temp=data; v\7k
} w}n:_e
int i1=l; CY2DxP %
int i2=mid+1; L$zI_
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for(int cur=l;cur<=r;cur++){ !#cZ!
if(i1==mid+1) 8was/^9;
data[cur]=temp[i2++]; 5"(AqXoq
else if(i2>r) HRS|VC$tz
data[cur]=temp[i1++]; SjgF&LD
else if(temp[i1] data[cur]=temp[i1++]; [ox!MQ+s
else k#"Pv"
data[cur]=temp[i2++]; K|*Cka{
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改进后的归并排序: [XFZ2'OO
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package org.rut.util.algorithm.support; s'%KKC
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import org.rut.util.algorithm.SortUtil; aIaydu+ \
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/** J]uYXsC
* @author treeroot 9D74/3b*
* @since 2006-2-2 ?m-kpW8
* @version 1.0 Y68`B"3
*/ 9HMW!DSK`
public class ImprovedMergeSort implements SortUtil.Sort { mY"DYYR>
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private static final int THRESHOLD = 10; d5<@WI:wz
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/* YbZ<=ZzO4
* (non-Javadoc) T=7V+
* EN@LB2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]PdpC"
*/ Ycb<'M*jE
public void sort(int[] data) { Yh/-6wg
int[] temp=new int[data.length]; $$YLAgO4
mergeSort(data,temp,0,data.length-1); 4/D~H+k
} G3QB Rh{
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private void mergeSort(int[] data, int[] temp, int l, int r) { y@g{:/cmO
int i, j, k; g;en_~g3j
int mid = (l + r) / 2; K]dqK'
if (l == r) kfb+OE:7
return; 0^44${bA
if ((mid - l) >= THRESHOLD) $eQ_!7Gom$
mergeSort(data, temp, l, mid); 8OC5L1
else ;aYPv8s~,:
insertSort(data, l, mid - l + 1); &8t?OpB =h
if ((r - mid) > THRESHOLD) o:C:obiQbu
mergeSort(data, temp, mid + 1, r); 6suB!XF;
else Bv"Fx*{W
insertSort(data, mid + 1, r - mid); WH :+HNl1d
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for (i = l; i <= mid; i++) { 'qLk"
temp = data; j9C=m"O
} :4$Ex2
for (j = 1; j <= r - mid; j++) { oQ!} @CaN|
temp[r - j + 1] = data[j + mid]; J)(H-xvV
} ;@K,>$ur-
int a = temp[l]; G[u_Uu=>
int b = temp[r]; W.p->,N
for (i = l, j = r, k = l; k <= r; k++) { G\h8j*o
if (a < b) { QQ@, v@j5
data[k] = temp[i++]; G}i\UXFE
a = temp; A`u04Lm7
} else { v}dt**l
data[k] = temp[j--]; o*/\oVOq
b = temp[j]; IDBhhv3ak
} +AyQ4Q(-o
} M0o=bYI
} Y%qhgzz?/
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/** OB3AZH$
* @param data ><OdHRh@#
* @param l z2t;!]"'l
* @param i lj%8(X u
*/ `(aU_r=
private void insertSort(int[] data, int start, int len) { W"Dj+/uS
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 9.e?<u*-z
} n]4)~ZIAU
} Rz`<E97-
} 93fKv
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}